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- Title
- PREPARATION AND CHARACTERISATION OF STABILIZED NAFION/PHOSPHOTUNGSTIC ACID COMPOSITE MEMBRANES FOR PROTON EXCHANGE MEMBRANE FUEL CELL (PEMFC) AUTOMOBILE ENGINES.
- Creator
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Agarwal, Rohit, Fenton, James, University of Central Florida
- Abstract / Description
-
Membrane durability is one of the limiting factors for proton exchange membrane fuel cell (PEMFC) commercialisation by limiting the lifetime of the membrane via electrochemical / mechanical / thermal degradation. Lower internal humidity in the membrane at high temperature (>100 oC) and low relative humidity (25-50 %RH) operating conditions leads to increased resistance, lowering of performance and higher degradation rate. One of the promising candidates is composite proton exchange membranes ...
Show moreMembrane durability is one of the limiting factors for proton exchange membrane fuel cell (PEMFC) commercialisation by limiting the lifetime of the membrane via electrochemical / mechanical / thermal degradation. Lower internal humidity in the membrane at high temperature (>100 oC) and low relative humidity (25-50 %RH) operating conditions leads to increased resistance, lowering of performance and higher degradation rate. One of the promising candidates is composite proton exchange membranes (CPEMs) which have heteropoly acid (HPA) e.g. Phosphotungstic acid (PTA) doped throughout the Nafion® matrix. HPA is primarily responsible for carrying intrinsic water which reduces the external water dependence. The role of relative humidity during membrane casting was studied using surface analysis tools such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Thermo-gravimetric analysis (TGA), and Scanning electron microscopy (SEM) / Energy dispersive spectrometer (EDS). Membrane casting at lower relative humidity (30% approx.) results in finer size, and better PTA incorporation in the composite membrane. The effect of increase in PTA concentration in the Nafion matrix was studied with regards to conductivity, performance and durability. In-plane conductivity measurements were performed at 80 oC and 120 oC. During theses measurements, relative humidity was varied from 20% to 100% RH. Membrane conductivity invariably increases on increasing the relative humidity or operating temperature of the cell. Membrane conductivity increases with increasing PTA content from 3% to 25% PTA but never reaches the conductivity of membrane with 0% PTA. Possible explanation might be the role of cesium in PTA stabilisation process. Cesium forms a complex compound with PTA inside host matrix, rendering the PTA incapable of holding water. In plane conductivity measurements only measure surface conductivity, hence another reason might be the existence of a PTA skin on the membrane surface which is not truly representative of the whole membrane. XRD revealed that the structure of the composite membrane changes significantly on addition of PTA. Membrane with 3% PTA has structure similar to Nafion® and does not exhibit the characteristic 25o and 35o 2Ө peaks while membrane with 15% PTA and 25% PTA have strong characteristic PTA peaks. Also the membrane structure with 25% PTA matches well with that of PTA.6H2O. By applying the Scherer formula, PTA particle size was calculated from Full width half maximum (FWHM) studies at 17o 2Ө peak of the membranes. Particles coalesce on increasing the PTA concentration in the membrane leading to larger particles but still all particles were in nanometer range. Also the FWHM of membranes decreased at 17o 2Ө peak on increasing the PTA concentration, leading to higher crystallinity in the membrane. Structure analysis by FTIR indicated increase in PTA signature intensity dips, as the PTA concentration in membrane increases from 0-25%. Also by FTIR studies, it was found that some PTA is lost during the processing step as shown by comparison of as cast and protonated spectra. Possible reasoning might be that some amount of PTA does not gets cesium stabilized which gets leached away during processing. TGA studies were performed which showed no signs of early thermal degradation (temperature >300 oC); hence the assumption that all membranes are thermally robust for intended fuel cell applications. The membranes with different amounts of PTA were then catalyst coated and tested for 100-hour at open circuit voltage (OCV), 30% RH and 90 oC. By increasing the PTA in the host Nafion® matrix, the percent change in fuel crossover decreases, percent change in ECA increases, cathode fluoride emission rate decreases, and percent change in OCV decreases after the 100 hour test. Possible reasons for decreasing percentage of fuel crossover might be the increased internal humidity of the membrane due to increasing PTA incorporation. It is reported that during higher relative humidity operation, there is decrease in fuel crossover rate. Increasing ECA percentage loss might be due to the fact that HPA in the membrane can get adsorbed on the catalyst sites, rendering the sites inactive for redox reaction. Decrease in cathode fluorine emission rate (FER) might be due to the fact that there is more water available internally in the membrane as compared to Nafion®. It is reported that at higher relative humidity, FER decreases. ECA and crossover both contribute to the OCV losses. Higher component of OCV is crossover loss, which results in mixed potentials. Hence decreasing percentage of crossover might be the reason behind the decreasing OCV loss. Initial performance of fuel cell increases with increasing PTA concentration, but after the 100 hour test, higher PTA membrane exhibited highest performance loss. Increasing initial fuel cell performance can be due to the lowering of resistance due to PTA addition. Increasing ECA losses might be responsible for the increasing performance losses on adding more PTA to host membrane.
Show less - Date Issued
- 2008
- Identifier
- CFE0002486, ucf:47677
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002486
- Title
- Comorbidity of Psychopathy in Schizotypy: Skin Conductance to Affective Pictures.
- Creator
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Ragsdale, Kathleen, Bedwell, Jeffrey, Cassisi, Jeffrey, Sims, Valerie, University of Central Florida
- Abstract / Description
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Prior research substantiates a relationship between psychopathy and schizophrenia-spectrum disorders, which has begun to elucidate why some individuals with schizophrenia are violent. Unfortunately, this relationship has been limited to self-report. To objectively corroborate this finding, undergraduate students were recruited from an online screening administration of the Schizotypal Personality Questionnaire. This resulted in 56 participants (52% male) with a mean age of 20.37 (SD = 4.74)...
Show morePrior research substantiates a relationship between psychopathy and schizophrenia-spectrum disorders, which has begun to elucidate why some individuals with schizophrenia are violent. Unfortunately, this relationship has been limited to self-report. To objectively corroborate this finding, undergraduate students were recruited from an online screening administration of the Schizotypal Personality Questionnaire. This resulted in 56 participants (52% male) with a mean age of 20.37 (SD = 4.74) and a wide range of schizotypy scores who participated in the experiment. Following completion of self-report measures, participants viewed 15 pictures (five neutral, five threatening, and five of others in distress) from the International Affective Pictures System while electrodermal activity was recorded from one palm. As expected, all participants exhibited increased peak skin conductance (SC) to both threat and distress pictures compared to neutral pictures; however; no difference was found between threat and distress pictures. Although the self-report relationship was replicated, neither total psychopathy nor total schizotypy were related to any SC variable. Therefore, it does not appear that increased schizotypy was related to a differential SC response to emotional pictures in our sample, even after testing for the potential moderating influence of anxiety and the Self-Centered Impulsivity factor of psychopathy. Total schizotypy was, however, significantly and positively related to the Personality Assessment Inventory Aggression scale (including the subscales of Aggressive Attitude and Physical Aggression) and the total score on the Beck's Anxiety Inventory. Overall findings suggest that despite presence of the comorbidity in this subclinical population, subthreshold levels of both constructs do not relate to a reduced SC response to affective pictures as is seen in clinical psychopathy.
Show less - Date Issued
- 2012
- Identifier
- CFE0004426, ucf:49357
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004426
- Title
- "UNNATURAL CONDUCT & FORCED DIFFICULTIES": AUSTEN, READING, AND THE PARADOX OF THE FEMININE IDEAL.
- Creator
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Dickens, Faith, Oliver, Kathleen, University of Central Florida
- Abstract / Description
-
Though some scholars have maintained that Jane Austen closely adheres to the ideology of courtesy novels and conduct literature, I argue that Austen uses her knowledge of this ideology to reveal the flaws in reader assumptions about the presumed commonsensical nature of the courtesy novel and its feminine ideal. Austen is familiar with the conventions of eighteenth-century fiction, but, rather than adopting its tropes in her own work, she uses realism to parody its excesses and...
Show moreThough some scholars have maintained that Jane Austen closely adheres to the ideology of courtesy novels and conduct literature, I argue that Austen uses her knowledge of this ideology to reveal the flaws in reader assumptions about the presumed commonsensical nature of the courtesy novel and its feminine ideal. Austen is familiar with the conventions of eighteenth-century fiction, but, rather than adopting its tropes in her own work, she uses realism to parody its excesses and improbabilities; this realism then works against reader expectations and exposes paradoxes inherent in the courtesy novel and in conduct-book literature itself. In my thesis I observe how Austen uses courtesy novel tropes to expose or even mock the courtesy novel's inherently unrealistic qualities, and I do so by examining the act of "reading" in her novels: specifically, I argue that the literal reading that Austen's characters engage in does not produce the expected outcomes predicted by conduct books and courtesy novels; that the figurative reading of one character by another demonstrates the dangerousness and unsuitability of the heroine as "open book," as conduct books and courtesy novels urged her to be, as well as the irrationality and hypocrisy of acting the part of "closed book" to her intended lover; and, finally, that the act of reading an Austen novel is intended to prevent the absorption or interpretation of unrealistic ideals, through insistence on (more) realistic outcomes and through narrative intervention.
Show less - Date Issued
- 2011
- Identifier
- CFH0004095, ucf:44784
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004095
- Title
- PREDICTION AND MEASUREMENT OF RADIATED EMISSIONS BASED ON EMPIRICAL TIME DOMAIN CONDUCTED MEASUREMENTS.
- Creator
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Freeman, Larry, Wu, Thomas, University of Central Florida
- Abstract / Description
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This thesis develops a novel method to predict radiated emissions measurements. The techniques used are based on standard Electromagnetic Compatibility (EMC) qualification test methods. The empirical data used to formulate the final results was restricted to pertinent data protocol waveforms however the entire method may be applied to any waveforms for which empirical radiated emissions have been measured. The method provides a concise means for predicting worst case radiated emissions...
Show moreThis thesis develops a novel method to predict radiated emissions measurements. The techniques used are based on standard Electromagnetic Compatibility (EMC) qualification test methods. The empirical data used to formulate the final results was restricted to pertinent data protocol waveforms however the entire method may be applied to any waveforms for which empirical radiated emissions have been measured. The method provides a concise means for predicting worst case radiated emissions profiles based on empirical measured data.
Show less - Date Issued
- 2006
- Identifier
- CFE0001294, ucf:46880
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001294
- Title
- INFRARED SURFACE PLASMON POLARITONS ON SEMICONDUCTOR, SEMIMETAL AND CONDUCTING POLYMER.
- Creator
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Shahzad, Monas, Peale, Robert, Heinrich, Helge, Coffey, Kevin, Diaz, Diego, University of Central Florida
- Abstract / Description
-
Conductors with IR (infrared) plasma frequencies are potentially useful hosts of surface plasmon polaritons (SPPs) with subwavelength mode confinement for sensing applications. The underlying aim of this work is to identify such conductors that also have sharp SPP excitation resonances for biosensor applications at infrared (3-11 ?m) wavelengths, where biological analytes are strongly differentiated by their IR absorption spectra. In this work, various materials were investigated such as a...
Show moreConductors with IR (infrared) plasma frequencies are potentially useful hosts of surface plasmon polaritons (SPPs) with subwavelength mode confinement for sensing applications. The underlying aim of this work is to identify such conductors that also have sharp SPP excitation resonances for biosensor applications at infrared (3-11 ?m) wavelengths, where biological analytes are strongly differentiated by their IR absorption spectra. In this work, various materials were investigated such as a heavily doped semiconductor, a semimetal, a conducting polymer and its composite.Heavily doped silicon was investigated by tuning its plasma frequency to the infrared region by heavily doping. The measured complex permittivity spectra for p-type silicon with a carrier concentration of 6 (&)#215; 1019 and 6 (&)#215; 1020 cm-3 show that these materials support SPPs beyond 11 and 6 ?m wavelengths, respectively. SPP generation was observed in angular reflection spectra of doped-silicon gratings. Photon-to-plasmon coupling resonances, a necessary condition for sensing, were demonstrated near 10 ?m wavelength for the heaviest doped, and the observed resonances were confirmed theoretically using analytic calculations. The permittivity spectra were also used to calculate SPP mode heights above the silicon surface and SPP propagation lengths. Reasonable merit criteria applied to these quantities suggest that only the heaviest doped material has sensor potential, and then mainly within the wavelength range of 6 to 10 ?m. The semimetal bismuth (Bi) has an infrared plasmon frequency less than the infrared plasma frequency of noble metals such as gold and silver, which is one order of magnitude lower than their plasma frequencies. The excitation of IR surface plasmons on Bi lamellar gratings in the wavelength range of 3.4 (&)#181;m to 10.6 (&)#181;m was observed. Distinct SPP resonances were observed although the usual condition for bound SPP is not satisfied in this wavelength range because the real part of the permittivity is positive. The excitation of these resonances agrees theoretically with the electromagnetic surface waves called surface polaritons (SPs). The measured permittivity spectra were used to calculate the SP mode heights above the bismuth surface and SP propagation length, which satisfied our criteria for sensors.A conducting polymer and its composite with graphite were also investigated since their plasma frequency may lie in the infrared region. Polyaniline was chemically synthesized and doped with various acids to prepare its salt form. A composite material of polyaniline with colloidal and nano-graphite was also prepared. Optical constants were measured in the long wave infrared region (LWIR) and were used to calculate SPP propagation length and penetration depth. SPP resonance spectra were calculated and suggested that polyaniline and its composite can be used as a host with sufficient mode confinement for IR sensor application.
Show less - Date Issued
- 2012
- Identifier
- CFE0004598, ucf:49215
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004598
- Title
- DEVELOPMENT OF HYDRAULIC AND SOIL PROPERTIES FOR SOIL AMENDMENTS AND NATIVE SOILS FOR RETENTION PONDS IN MARION COUNTY, FLORIDA.
- Creator
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Naujock, Lisa, Chopra, Manoj, University of Central Florida
- Abstract / Description
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The vadose zone plays an important role in managing stormwater. Predicting the water balance and water movement is crucial in ground water remediation to keep water suitable for use. To aid in understanding soils ability to transmit and store water, soil and hydraulic properties were analyzed for soils in Marion County, Florida, and potential soil amendments. Soil and hydraulic properties were examined for two soil amendments and for the soils in Marion County, Florida, at the South Oak and...
Show moreThe vadose zone plays an important role in managing stormwater. Predicting the water balance and water movement is crucial in ground water remediation to keep water suitable for use. To aid in understanding soils ability to transmit and store water, soil and hydraulic properties were analyzed for soils in Marion County, Florida, and potential soil amendments. Soil and hydraulic properties were examined for two soil amendments and for the soils in Marion County, Florida, at the South Oak and the Hunter's Trace locations. The hydraulic properties measured were the soil moisture retention curve (SMRC) and saturated hydraulic conductivity (Ks). The soil properties measured were the particle-size distribution (PSD) and the specific gravity. From these, the bulk density and porosity were calculated. The SMRC corresponds to the water holding capacities, while the Ks corresponds to the soils ability to transmit water. Both are dependent on the soil properties. The SMRC for the soil amendments and native soils were developed in the laboratory using a Tempe Cell apparatus. In addition, the SMRC was measured in the field at the Hunter's Trace location with time domain reflectometry (TDR) and tensiometer equipment at three depths of 1-ft, 2-ft, and 3-ft over approximate a two month period. The SMRC obtained in the laboratory was compared to two analytical models, Brooks and Corey and van Genuchten, and to the field data. There is a strong correlation between the laboratory, analytical, and field SMRC for both South Oak and Hunter's Trace. In addition, there is a strong correlation between the laboratory SMRC and analytical models for the soil amendments. The Arya and Paris (AP) model, a pedotransfer function, was examined for its accuracy in predicting the SMRC for the soils at South Oak and Hunter's Trace, in addition to the soil amendments. Measuring the SMRC in the lab is a time consuming process; therefore, inferring the SMRC from textural and structural soil properties which are easier measured characteristics would be advantageous.
Show less - Date Issued
- 2008
- Identifier
- CFE0002410, ucf:47750
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002410
- Title
- Student Conduct Administrators' Perceptions of Effective Sanctions That Reduce Recidivism of Alcohol Violations Among College Students.
- Creator
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Fils-Aime, Andel, Cintron Delgado, Rosa, Owens, J. Thomas, Butler, S. Kent, Malaret, Stacey, University of Central Florida
- Abstract / Description
-
Recent researchers have found that when alcohol use and/or abuse is a factor in an undergraduate students' college experience, there is a substantial increase in dependence, decreased academic productivity, an increase in safety and security issues, an increase in suicide ideation and attempts, unprotected sexual encounters, and physical assaults that result in injuries (Amaro et al., 2010). One of the most effective ways that institutions in higher education can combat alcohol-related issues...
Show moreRecent researchers have found that when alcohol use and/or abuse is a factor in an undergraduate students' college experience, there is a substantial increase in dependence, decreased academic productivity, an increase in safety and security issues, an increase in suicide ideation and attempts, unprotected sexual encounters, and physical assaults that result in injuries (Amaro et al., 2010). One of the most effective ways that institutions in higher education can combat alcohol-related issues on their campuses is for the institutional leaders to play a role in addressing this issue (Busteed, 2008). In many institutions of higher education, student conduct administrators have been designated as those institutional leaders with the responsibility of addressing alcohol policy violations and establishing a reasonable balance between disciplinary and educational sanctions issued to students (Waryold (&) Lancaster, 2013). The primary purpose of this research study was to evaluate student conduct administrators' perceptions of the relationship between recidivism and sanctions for alcohol violations at their colleges and universities. More specifically, this study explored the relationship of sanctions that students must complete after having been found responsible for violating the university's alcohol policy.
Show less - Date Issued
- 2017
- Identifier
- CFE0007282, ucf:52170
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007282
- Title
- "A Laudable Ambition Fired Her Soul": Conduct Fiction Helps Define Republican Womanhood, Community, and Education in the Works of Judith Sargent Murray, Hannah Webster Foster, and Susanna Rowson.
- Creator
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Workman, Jessica, Logan, Lisa, Kamrath, Mark, Oliver, Kathleen, University of Central Florida
- Abstract / Description
-
This study examines the major works of Judith Sargent Murray, Hannah Webster Foster, and Susanna Haswell Rowson, three major writers of the 1790s whose writing responds to the ideologies of the early American Republic. I suggest that Murray, Foster, and Rowson write conduct fiction which responds to the changing attitudes toward women and education after the American Revolution. Using fiction, these authors comment on the republican woman, the need for women's education, and the necessity for...
Show moreThis study examines the major works of Judith Sargent Murray, Hannah Webster Foster, and Susanna Haswell Rowson, three major writers of the 1790s whose writing responds to the ideologies of the early American Republic. I suggest that Murray, Foster, and Rowson write conduct fiction which responds to the changing attitudes toward women and education after the American Revolution. Using fiction, these authors comment on the republican woman, the need for women's education, and the necessity for women to gather in communities for support. Despite the prevailing notion that reading too many novels would corrupt young women, Judith Sargent Murray's novella, The Story of Margaretta (1786), Hannah Webster Foster's novels, The Coquette (1797) and The Boarding School (1798), and Susanna Rowson's novels, Charlotte Temple (1794) and Reuben and Rachel; or, Tales of Old Times (1798), were some of the most popular books in the late eighteenth century. If these novels were not meant to be read by young women, who were the authors' primary audience, why were they so popular? This project situates these questions in the political environment the authors were writing in to show that a relationship exists between what women were reading and how authors of conduct fiction helped facilitate the changing roles of women in the early Republic.
Show less - Date Issued
- 2011
- Identifier
- CFE0004180, ucf:49039
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004180
- Title
- Is Experiential Avoidance a Factor in Maternal Overprotection?.
- Creator
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Nieves, Melissa, Beidel, Deborah, Cassisi, Jeffrey, Rapport, Mark, University of Central Florida
- Abstract / Description
-
The current study examined experiential avoidance (EA) as an explanation for parental overprotectiveness, a behavior often found among parents of anxious children. EA parenting theory posits that parents engage in overprotective behaviors in order to reduce their own anxiety. In order to test the theory, mothers' electrodermal activity (EDA) and blindly-coded overprotective behaviors were examined when a child with SAD was engaged in a reading performance task. In line with EA theory, it was...
Show moreThe current study examined experiential avoidance (EA) as an explanation for parental overprotectiveness, a behavior often found among parents of anxious children. EA parenting theory posits that parents engage in overprotective behaviors in order to reduce their own anxiety. In order to test the theory, mothers' electrodermal activity (EDA) and blindly-coded overprotective behaviors were examined when a child with SAD was engaged in a reading performance task. In line with EA theory, it was hypothesized that EDA levels would increase before an overprotective behavior (OB) occurred and decrease afterwards as a result of decrease in anxiety. The sample consisted of mothers with a child diagnosed with SAD (n=5) and mothers with a child with no diagnoses (n=5). Each mother-child dyad participated in an ABAB design protocol consisting of a baseline period, two 10-minute reading tasks, and a recovery period between the two tasks. Although mothers of both groups displayed OBs, mothers of children with SAD displayed OBs more often. In addition, mothers of children with SAD displayed more promotion of avoidance while mothers of normal control children displayed higher frequencies of control over the reading task. The EDA activity that surrounded the first occurrence of any coded OB was examined. Contrary to the hypothesis, all mothers (regardless of child's anxiety status) displayed similar trends in their EDA data, with levels increasing but then decreasing shortly before an OB behavior occurred, rather than afterwards. However, one mother with an elevated social anxiety score revealed an EDA pattern similar to what was hypothesized. Possible explanations for these alternate findings are discussed and include a multidisciplinary conceptualization. The study's findings hold theoretical and practical implications, particularly for parent training in the treatment of childhood anxiety disorders. Limitations such as small sample size and directions for future research are discussed.
Show less - Date Issued
- 2013
- Identifier
- CFE0004902, ucf:49676
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004902
- Title
- MOLECULAR DYNAMICS STUDY OF THERMAL CONDUCTIVITY ENHANCEMENT OF WATER BASED NANOFLUIDS.
- Creator
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Sachdeva, Parveen, Kumar, Ranganathan, University of Central Florida
- Abstract / Description
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A systematic investigation using molecular dynamics (MD) simulation involving particle volume fraction, size, wettability and system temperature is performed and the effect of these parameters on the thermal conductivity of water based nanofluids is discussed. Nanofluids are a colloidal suspension of 10 -100 nm particles in base fluid. In the last decade, significant research has been done in nanofluids, and thermal conductivity increases in double digits were reported in the literature. This...
Show moreA systematic investigation using molecular dynamics (MD) simulation involving particle volume fraction, size, wettability and system temperature is performed and the effect of these parameters on the thermal conductivity of water based nanofluids is discussed. Nanofluids are a colloidal suspension of 10 -100 nm particles in base fluid. In the last decade, significant research has been done in nanofluids, and thermal conductivity increases in double digits were reported in the literature. This anomalous increase in thermal conductivity cannot be explained by classical theories like Maxwell's model and Hamilton-Crosser model for nanoparticle suspensions. Various mechanisms responsible for thermal conductivity enhancement in nanofluids have been proposed and later refuted. MD simulation allows one to predict the static and dynamic properties of solids and liquids, and observe the interactions between solid and liquid atoms. In this work MD simulation is used to calculate the thermal conductivity of water based nanofluid and explore possible mechanisms causing the enhancement. While most recent MD simulations have considered Lennard Jones (LJ) potential to model water molecule interactions, this work uses a flexible bipolar water molecule using the Flexible 3 Center (F3C) model. This model maintains the tetrahedral structure of the water molecule and allows the bond bending and bond stretching modes, thereby tracking the motion and interactions between real water molecules. The choice of the potential for solid nanoparticle reflects the need for economic but insightful analyses and reasonable accuracy. A simple two body LJ potential is used to model the solid nanoparticle. The cross interaction between the solid and liquid atoms is also modeled by LJ potential and the Lorentz-Berthelot mixing rule is used to calculate the potential parameters. The various atomic interactions show that there exist two regimes of thermal conductivity enhancement. It is also found that increasing particle size and decreasing particle wettability cause lower thermal conductivity enhancement. In contrast to the previous studies, it is observed that increasing system temperature does not enhance thermal conductivity significantly. Such enhancement with temperature is proportional to the conductivity enhancement of base fluid with temperature. This study demonstrates that the major cause of thermal conductivity enhancement is the formation of ordered liquid layer at the solid-liquid interface. The enhanced motion of the liquid molecules in the presence of solid particles is captured by comparing the mean square displacement (MSD) of liquid molecules in the nanofluid to that of the base fluid molecules. The thermal conductivity is decomposed into three modes that make up the microscopic heat flux vector, namely kinetic, potential and collision modes. It was observed by this decomposition analyses that most of the thermal conductivity enhancement is obtained from the collision mode and not from either the kinetic or potential mode. This finding also supports the observation made by comparing the MSD of liquid molecules with the base fluid that the interaction between solid and liquid molecules is important for the enhancement in thermal transport properties in nanofluids. These findings are important for the future research in nanofluids, because they suggest that if smaller, functional nanoparticles which have higher wettability compared to the base fluid can be produced, they will provide higher thermal conductivity compared to the regular nanoparticles.
Show less - Date Issued
- 2009
- Identifier
- CFE0002944, ucf:47969
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002944
- Title
- DETECTING BURIED METALLIC WEAPONS IN A CONTROLLED SETTING USING A CONDUCTIVITY METER AND A GROUND-PENETRATING RADAR.
- Creator
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Dionne, Charles, Schultz, John, University of Central Florida
- Abstract / Description
-
Searching for buried metallic evidence at crime scenes or at potential disposal sites can be a daunting task for forensic personnel. In particular, it is common to search for a small firearm that was discarded or buried by the perpetrator. When performing forensic searches, it is recommended to first use non-invasive methods such as geophysical instruments to minimize damage to evidence and to the crime scene. Geophysical tools are used to pinpoint small areas of interest across a scene that...
Show moreSearching for buried metallic evidence at crime scenes or at potential disposal sites can be a daunting task for forensic personnel. In particular, it is common to search for a small firearm that was discarded or buried by the perpetrator. When performing forensic searches, it is recommended to first use non-invasive methods such as geophysical instruments to minimize damage to evidence and to the crime scene. Geophysical tools are used to pinpoint small areas of interest across a scene that will be invasively tested later. Prior to this project, there was no published research that tested the utility of the conductivity meter to search for metallic weapons such as firearms and blunt or sharp edged weapons. A sample comprised of 32 metallic weapons was buried in a controlled setting to test the applicability of a conductivity meter for forensic searches. Weapons were tested at multiple depths; once data collection was performed for one depth, the weapons were reburied 5cm deeper until they were no longer detected. Results obtained with conductivity meter were compared to results obtained by the ground-penetrating radar using different depths and transect intervals. The effects of several variables on detection such as weapon size, metallic composition, burial depth, and transect interval were analyzed in order to explore the limitations of each instrument. Results obtained from this controlled research can provide guidelines to help law enforcement in real-world searches.
Show less - Date Issued
- 2009
- Identifier
- CFE0002597, ucf:48264
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002597
- Title
- The safe removal of frozen air from the annulus of a liquid hydrogen storage tank.
- Creator
-
Krenn, Angela, Bhattacharya, Aniket, Youngquist, Robert, Vasu Sumathi, Subith, University of Central Florida
- Abstract / Description
-
Large Liquid Hydrogen (LH2) storage tanks are vital infrastructure for NASA. Eventually, air may leak into the evacuated and perlite filled annular region of these tanks. Although the vacuum level is monitored in this region, the extremely cold temperature causes all but the helium and neon constituents of air to freeze. A small, often unnoticeable pressure rise is the result. As the leak persists, the quantity of frozen air increases, as does the thermal conductivity of the insulation system...
Show moreLarge Liquid Hydrogen (LH2) storage tanks are vital infrastructure for NASA. Eventually, air may leak into the evacuated and perlite filled annular region of these tanks. Although the vacuum level is monitored in this region, the extremely cold temperature causes all but the helium and neon constituents of air to freeze. A small, often unnoticeable pressure rise is the result. As the leak persists, the quantity of frozen air increases, as does the thermal conductivity of the insulation system. Consequently, a notable increase in commodity boiloff is often the first indicator of an air leak. Severe damage can then result from normal draining of the tank. The warming air will sublimate which will cause a pressure rise in the annulus. When the pressure increases above the triple point, the frozen air will begin to melt and migrate downward. Collection of liquid air on the carbon steel outer shell may chill it below its ductility range, resulting in fracture. In order to avoid a structural failure, as described above, a method for the safe removal of frozen air is needed. Two potential methods for air removal are evaluated here. The first method discussed is the connection of a vacuum pump to the annulus which provides pumping in parallel with drainage of LH2. The goal is to keep the annular pressure below the triple point so that the air continues to sublimate, thus eliminating the threat that liquefaction poses. The second method discussed is the application of heat to the bottom of the outer tank during tank drain. Though liquefaction in the annular space will occur, the goal of the heater design is to keep the outer shell above the embrittlement temperature, so that cracking will not occur.In order to evaluate these methods, it is first necessary to characterize some the physical properties and changes that take place in the system. A thermal model of the storage tank was created in SINDA/FLUINT (C(&)R Technologies, 2014) to identify locations where air can freeze. This model shows the volume that is capable of freezing air under varying conditions. It is also necessary to characterize the changes in thermal conductivity of perlite which has nitrogen frozen into its interstitial spaces. The details and results of an experiment designed for that purpose is outlined. All data, including operational data from existing LH2 tanks, is compiled and a physics-based evaluation of the two proposed air removal techniques is performed.Due to small pumping capacities at low pressure and the large quantity of air inside the annulus, the pumping option is not deemed feasible. It would take many years to remove a significant amount of air by pumping while maintaining the annular pressure below the necessary triple point. Application of heating devices is a feasible option. For a specific case, it is shown that approximately 105 kilowatts of power would be required to vaporize the air in the annulus and keep the temperature of the outer tank wall above the freezing point of water. Several engineering solutions to accomplish this are also discussed. There are many unknowns and complexities in addressing the problem of safely removing frozen air from the annulus of an LH2 storage sphere. The work that follows utilized: research, modeling, experimentation, analysis, and data from existing tanks to arrive at possible solutions to the problem. Heating solutions may be implemented immediately and could result in significant savings to the user.
Show less - Date Issued
- 2015
- Identifier
- CFE0005969, ucf:50766
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005969
- Title
- CROSS-TALK OF RETINOIC ACID AND ADRENERGIC HORMONE SIGNALING MAY INFLUENCE DEVELOPMENT OF CARDIAC CONDUCTION AND RHYTHMICITY IN UTERO.
- Creator
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Alam, Sabikha, Ebert, Steven, University of Central Florida
- Abstract / Description
-
Stress hormones, adrenaline and noradrenaline, have been shown to be critical for heart development. Mice lacking dopamine beta-hydroxylase (Dbh), an enzyme responsible for synthesis of these adrenergic hormones, die during mid-gestation due to cardiac failure. Prior research showed that adrenergic cells are found within the electrical conduction system of the heart, and adrenergic deficiency leads to slowed cardiac conduction during embryogenesis. Microarray analysis of wild-type (Dbh+/+)...
Show moreStress hormones, adrenaline and noradrenaline, have been shown to be critical for heart development. Mice lacking dopamine beta-hydroxylase (Dbh), an enzyme responsible for synthesis of these adrenergic hormones, die during mid-gestation due to cardiac failure. Prior research showed that adrenergic cells are found within the electrical conduction system of the heart, and adrenergic deficiency leads to slowed cardiac conduction during embryogenesis. Microarray analysis of wild-type (Dbh+/+) and knockout (Dbh-/-) mouse hearts revealed significant differences in expression of retinoic acid (RA) signaling genes. RA signaling has also been shown to be critical for heart development. These data suggest that heart failure due to adrenergic deficiency may be dependent upon RA signaling. This led to the hypothesis that adrenergic hormones promote the development of the electrical conduction system through modulation of RA signaling. To test this, embryonic mouse hearts were cultured with LE 135, a RA receptor blocker. Heart rate, arrhythmic index (AI) and conduction time were measured. Under these conditions there was a marked increase in arrhythmias. Hearts treated with LE 135 showed a mean AI of 0.232+/-0.057 after 24 hours of treatment while when untreated had an AI of 0.083+/-0.028 (p<0.05;n=15). In contrast, there was no significant change in heart rate or conduction speed after 24 hours with or without the retinoic acid receptor blocker. To determine if adrenergic stimulus influences retinoic acid response, an established RA-sensitive reporter cell line was employed. These F9-RARE-LacZ cells were treated with forskolin (cAMP regulator) and isoproterenol (beta-agonist) to measure changes in RA signaling. Evaluation of RA signaling showed an increase in retinoic acid responsiveness when treated with an adrenergic signaling agonist. These results suggest that proper retinoic acid signaling is essential for maintaining cardiac rhythmicity during embryonic development and adrenergic stimulation can influence this response.
Show less - Date Issued
- 2011
- Identifier
- CFH0003831, ucf:44726
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0003831
- Title
- EFFICIENT LARGE SCALE TRANSIENT HEAT CONDUCTION ANALYSIS USING A PARALLELIZED BOUNDARY ELEMENT METHOD.
- Creator
-
Erhart, Kevin, Divo, Eduardo, University of Central Florida
- Abstract / Description
-
A parallel domain decomposition Laplace transform Boundary Element Method, BEM, algorithm for the solution of large-scale transient heat conduction problems will be developed. This is accomplished by building on previous work by the author and including several new additions (most note-worthy is the extension to 3-D) aimed at extending the scope and improving the efficiency of this technique for large-scale problems. A Laplace transform method is utilized to avoid time marching and a Proper...
Show moreA parallel domain decomposition Laplace transform Boundary Element Method, BEM, algorithm for the solution of large-scale transient heat conduction problems will be developed. This is accomplished by building on previous work by the author and including several new additions (most note-worthy is the extension to 3-D) aimed at extending the scope and improving the efficiency of this technique for large-scale problems. A Laplace transform method is utilized to avoid time marching and a Proper Orthogonal Decomposition, POD, interpolation scheme is used to improve the efficiency of the numerical Laplace inversion process. A detailed analysis of the Stehfest Transform (numerical Laplace inversion) is performed to help optimize the procedure for heat transfer problems. A domain decomposition process is described in detail and is used to significantly reduce the size of any single problem for the BEM, which greatly reduces the storage and computational burden of the BEM. The procedure is readily implemented in parallel and renders the BEM applicable to large-scale transient conduction problems on even modest computational platforms. A major benefit of the Laplace space approach described herein, is that it readily allows adaptation and integration of traditional BEM codes, as the resulting governing equations are time independent. This work includes the adaptation of two such traditional BEM codes for steady-state heat conduction, in both two and three dimensions. Verification and validation example problems are presented which show the accuracy and efficiency of the techniques. Additionally, comparisons to commercial Finite Volume Method results are shown to further prove the effectiveness.
Show less - Date Issued
- 2006
- Identifier
- CFE0001291, ucf:46881
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001291
- Title
- HIGH QUALITY GATE DIELECTRIC/MoS2 INTERFACES PROBED BY THE CONDUCTANCE METHOD.
- Creator
-
Krishnaprasad Sharada, Adithi Pandrahal, Roy, Tania, Abdolvand, Reza, Yuan, Jiann-Shiun, University of Central Florida
- Abstract / Description
-
Two-dimensional materials provide a versatile platform for various electronic and optoelectronic devices, due to their uniform thickness and pristine surfaces. We probe the superior quality of 2D/2D and 2D/3D interfaces by fabricating molybdenum disulfide (MoS2)-based field effect transistors having hexagonal boron nitride (h-BN) and Al2O3 as the top gate dielectrics. An extremely low trap density of ~7x10^10 states/cm2-eV is extracted at the 2D/2D interfaces with h-BN as the top gate...
Show moreTwo-dimensional materials provide a versatile platform for various electronic and optoelectronic devices, due to their uniform thickness and pristine surfaces. We probe the superior quality of 2D/2D and 2D/3D interfaces by fabricating molybdenum disulfide (MoS2)-based field effect transistors having hexagonal boron nitride (h-BN) and Al2O3 as the top gate dielectrics. An extremely low trap density of ~7x10^10 states/cm2-eV is extracted at the 2D/2D interfaces with h-BN as the top gate dielectric on the MoS2 channel. 2D/3D interfaces with Al2O3 as the top gate dielectric and SiOx as the nucleation layer exhibit trap densities between 7x10^10 and 10^11 states/cm2-eV, which is lower than previously reported 2D-channel/high-k-dielectric interface trap densities. The comparable values of trap time constants for both interfaces imply that similar types of defects contribute to the interface traps. This work establishes the case for van der Waals systems where the superior quality of 2D/2D and 2D/high-k dielectric interfaces can produce high performance electronic and optoelectronic devices.
Show less - Date Issued
- 2018
- Identifier
- CFE0007214, ucf:52209
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007214
- Title
- Teaching Online and Cyberbullying: Examining Higher Education Cyberbullying Policies In The Florida State University System.
- Creator
-
Raditch, Joseph, Cox, Thomas, Marshall, Nancy, Preston, Michael, Brown, Tim, University of Central Florida
- Abstract / Description
-
The cyberbullying phenomena has been recorded as affecting students and faculty alike in the K-12 and higher education systems. Cyberbullying in higher education has negative effects to the institution and its stakeholders, including faculty turn over and student suicide. While these responses are highly publicized, the effects of cyberbullying on the online classroom remain relatively untouched by researchers. There are very few resources available to faculty who teach online courses for...
Show moreThe cyberbullying phenomena has been recorded as affecting students and faculty alike in the K-12 and higher education systems. Cyberbullying in higher education has negative effects to the institution and its stakeholders, including faculty turn over and student suicide. While these responses are highly publicized, the effects of cyberbullying on the online classroom remain relatively untouched by researchers. There are very few resources available to faculty who teach online courses for creating strategies to combat cyberbullying in that context. Furthermore, many states, including Florida, defer conduct policies and their enforcement to the individual institution. While there are many aspects of cyberbullying within the online course in higher education that remain unexplored by research, this study seeks to breach the subject by analyzing the policies at Florida public universities. Using document analysis, this study analyzed policies from the 12 state universities capturing the definition of cyberbullying and recommended reporting practices for faculty on cyberbullying from each institution. By framing the results of the analysis through the community of inquiry, this study provides value to faculty seeking to strengthen their online teaching presence through providing clear guidelines established by each Florida institution. It will also provide value to administrators at institutions within the United States who are reviewing their policies addressing online abuse and cyberbullying by identifying to common definitions currently used within public institutions.
Show less - Date Issued
- 2019
- Identifier
- CFE0007853, ucf:52798
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007853
- Title
- Development of Polymer Derived SiAlCN Ceramic and Its Applications for High-Temperature Sensors.
- Creator
-
Shao, Gang, An, Linan, Fang, Jiyu, Xu, Chengying, Chow, Lee, Deng, Weiwei, University of Central Florida
- Abstract / Description
-
Polymer-derived ceramic (PDC) is the name for a class of materials synthesized by thermal decomposition of polymeric precursors which excellent thermomechanical properties, such as high thermal stability, high oxidation/corrosion resistance and high temperature multifunctionalities. Direct polymer-to-ceramic processing routes of PDCs allow easier fabrication into various components/devices with complex shapes/structures. Due to these unique properties, PDCs are considered as promising...
Show morePolymer-derived ceramic (PDC) is the name for a class of materials synthesized by thermal decomposition of polymeric precursors which excellent thermomechanical properties, such as high thermal stability, high oxidation/corrosion resistance and high temperature multifunctionalities. Direct polymer-to-ceramic processing routes of PDCs allow easier fabrication into various components/devices with complex shapes/structures. Due to these unique properties, PDCs are considered as promising candidates for making high-temperature sensors for harsh environment applications, including high temperatures, high stress, corrosive species and/or radiation. The SiAlCN ceramics were synthesized using the liquid precursor of polysilazane (HTT1800) and aluminum-sec-tri-butoxide (ASB) as starting materials and dicumyl peroxide (DP) as thermal initiator. The as-received SiAlCN ceramics have very good thermal-mechanical properties and no detectable weight loss and large scale crystallization. Solid-state NMR indicates that SiAlCN ceramics have the SiN4, SiO4, SiCN3, and AlN5/AlN6 units. Raman spectra reveals that SiAlCN ceramics contain (")free carbon(") phase with two specific Raman peaks of (")D(") band and (")G(") band at 1350 cm-1 and 1600 cm-1, respectively. The (")free carbon(") becomes more and more ordered with increasing the pyrolysis temperature. EPR results show that the defects in SiAlCN ceramics are carbon-related with a g-factor of 2.0016(&)#177;0.0006. Meanwhile, the defect concentration decreases with increasing sintered temperature, which is consistent with the results obtained from Raman spectra.Electric and dielectric properties of SiAlCN ceramics were characterized. The D.C. conductivity of SiAlCN ceramics increases with increasing sintered temperature and the activation energy is about 5.1 eV which higher than that of SiCN ceramics due to the presence of oxygen. The temperature dependent conductivity indicates that the conducting mechanism is a semiconducting band-gap model and follows the Arrhenius equation with two different sections of activation energy of 0.57 eVand 0.23 eV, respectively. The temperature dependent conductivity makes SiAlCN ceramics suit able for high temperature sensor applications. The dielectric properties were carried out by the Agilent 4298A LRC meter. The results reveal an increase in both dielectric constant and loss with increasing temperature (both pyrolysis and tested). Dielectric loss is dominated by the increasing of conductivity of SiAlCN ceramics at high sintered temperatures.SiAlCN ceramic sensors were fabricated by using the micro-machining method. High temperature wire bonding issues were solved by the integrity embedded method (IEM). It's found that the micro-machining method is a promising and cost-effective way to fabricate PDC high temperature sensors. Moreover IEM is a good method to solve the high temperature wire bonding problems with clear bonding interface between the SiAlCN sensor head and Pt wires. The Wheatstone bridge circuit is well designed by considering the resistance relationship between the matching resistor and the SiAlCN sensor resistor. It was found that the maximum sensitivity can be achieved when the resistance of matching resistor is equal to that of the SiAlCN sensor. The as-received SiAlCN ceramic sensor was tested up to 600 degree C with the relative output voltage changing from -3.932 V to 1.153 V. The results indicate that the relationship between output voltage and test temperature is nonlinear. The tested sensor output voltage agrees well with the simulated results. The durability test was carried out at 510 degree C for more than two hours. It was found that the output voltage remained constant for the first 30 min and then decreased gradually afterward by 0.02, 0.04 and 0.07 V for 1, 1.5 and 2 hours.
Show less - Date Issued
- 2013
- Identifier
- CFE0004937, ucf:49602
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004937
- Title
- Reactive sputter deposition of lithium phosphorus oxynitride thin films, a Li battery solid state electrolyte.
- Creator
-
Mani, Prabhu Doss, Coffey, Kevin, Heinrich, Helge, Hickman, James, Sundaram, Kalpathy, University of Central Florida
- Abstract / Description
-
Lithium phosphorus oxy-nitride (LiPON) thin films are widely studied and used as a thin film electrolyte for lithium ion battery applications. LiPON thin films may be prepared by many techniques, but RF sputter deposition is most frequently used and was investigated in this dissertation, in spite of its low deposition rate, because of it offers more reliable and controllable processing. This dissertation includes the methodologies of sputter deposition and materials characterization of the...
Show moreLithium phosphorus oxy-nitride (LiPON) thin films are widely studied and used as a thin film electrolyte for lithium ion battery applications. LiPON thin films may be prepared by many techniques, but RF sputter deposition is most frequently used and was investigated in this dissertation, in spite of its low deposition rate, because of it offers more reliable and controllable processing. This dissertation includes the methodologies of sputter deposition and materials characterization of the LiPON thin film electrolytes.The LiPON thin films were deposited under varying conditions of process gas, substrate bias, and deposition temperature. To understand the variations in ionic conductivity observed, the films were extensively characterized to examine structural and compositional differences, including examination by x-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectroscopy (ICP/OES), and spectroscopic ellipsometry. In addition, film density, and the intrinsic stress of the deposited films were also studied.The highest ionic conductivity of 9.8 x 10-6 S/cm was obtained at elevated deposition temperature and is correlated to a reduced density of defects, as indicated from the optical characterization.
Show less - Date Issued
- 2015
- Identifier
- CFE0005835, ucf:50929
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005835
- Title
- Development of Full Surface Transient Thermochromic Liquid Crystal Technique for Internal Cooling Channels.
- Creator
-
Tran, Lucky, Kapat, Jayanta, Kassab, Alain, Vasu Sumathi, Subith, University of Central Florida
- Abstract / Description
-
Proper design of high performance industrial heat transfer equipment relies on accurate knowledge and prediction of the thermal boundary conditions. In order to enhance the overall gas turbine efficiency, advancements in cooling technology for gas turbines and related applications are continuously investigated to increase the turbine inlet temperature without compromising the durability of the materials used. For detailed design, local distributions are needed in addition to bulk quantities....
Show moreProper design of high performance industrial heat transfer equipment relies on accurate knowledge and prediction of the thermal boundary conditions. In order to enhance the overall gas turbine efficiency, advancements in cooling technology for gas turbines and related applications are continuously investigated to increase the turbine inlet temperature without compromising the durability of the materials used. For detailed design, local distributions are needed in addition to bulk quantities. Detailed local distributions require advanced experimental techniques whereas they are readily available using numerical tools. Numerical predictions using a computational fluid dynamics approach with popular turbulence models are benchmarked against a semi-empirical correlation for the friction in a circular channel with repeated-rib roughness to demonstrate some shortcomings of the models used. Numerical predictions varied widely depending on the turbulence modelling approach used. The need for a compatible experimental dataset to accompany numerical simulations was discussed.An exact, closed-form analytical solution to the enhanced lumped capacitance model is derived. The temperature evolution in a representative 2D turbulated surface is simulated using Fluent to validate the model and its exact solution. A case including an interface contact resistance was included as well as various rib sizes to test the validity of the model over a range of conditions. The analysis was extended to the inter-rib region to investigate the extent and magnitude of the influence of the metallic rib features on the apparent heat transfer coefficients in the inter-rib region. It was found that the thermal contamination is limited only to the regions closest to the base of the rib feature.An experimental setup was developed, capable of measuring the local heat transfer distributions on all four channel walls of a rectangular channel (with aspect ratios between 1 and 5) at Reynolds numbers up to 150,000. The setup utilizes a transient thermochromic liquid crystals technique using narrow band crystals and a four camera setup. The setup is used to test a square channel with ribs applied to one wall. Using the transient thermochromic liquid crystals technique and applying it underneath high conductivity, metallic surface features, it is possible to calculate the heat transfer coefficient using a lumped heat capacitance approach. The enhanced lumped capacitance model is used to account for heat conduction into the substrate material. Rohacell and aluminum ribs adhered to the surface were used to tandem to validate the hybrid technique against the standard technique. Local data was also used to investigate the effect of thermal contamination. Thermal contamination observed empirically was more optimistic than numerical predictions.Traditional transient thermochromic liquid crystals technique utilizes the time-to-arrival of the peak intensity of the green color signal. The technique has been extended to utilize both the red and green color signals, increasing the throughput by recovering unused data while also allowing for a reduction in the experimental uncertainty of the calculated heat transfer coefficient. The over-determined system was solved using an un-weighted least squares approach. Uncertainty analysis of the multi-color technique demonstrated its superior performance over the single-color technique. The multi-color technique has the advantage of improved experimental uncertainty while being easy to implement.
Show less - Date Issued
- 2014
- Identifier
- CFE0005430, ucf:50436
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005430