View All Items
(21 - 40 of 135)
Pages
- Title
- Planar Laser Induced Fluorescence Experiments and Modeling Study of Jets in Crossflow at Various Injection Angles.
- Creator
-
Thompson, Luke, Vasu Sumathi, Subith, Kassab, Alain, Kapat, Jayanta, University of Central Florida
- Abstract / Description
-
Planar Laser Induced Fluorescence (PLIF) with acetone seeding was applied to measure the scalar fields of an axisymmetric freejet and an inclined jet-in-crossflow as applicable to film cooling. From the scalar fields, jet-mixing and trajectory characteristics were obtained. In order to validate the technique, the canonical example of a nonreacting freejet of Reynolds Numbers 900-9000 was investigated. Desired structural characteristics were observed and showed strong agreement with...
Show morePlanar Laser Induced Fluorescence (PLIF) with acetone seeding was applied to measure the scalar fields of an axisymmetric freejet and an inclined jet-in-crossflow as applicable to film cooling. From the scalar fields, jet-mixing and trajectory characteristics were obtained. In order to validate the technique, the canonical example of a nonreacting freejet of Reynolds Numbers 900-9000 was investigated. Desired structural characteristics were observed and showed strong agreement with computational modeling. After validating the technique with the axisymmetric jet, the jet-in-crossflow was tested with various velocity ratios and jet injection angles. Results indicated the degree of wall separation for different injection angles and demonstrate both the time-averaged trajectories as well as select near-wall concentration results for varying jet momentum fluxes. Consistent with literature findings, the orthogonal jet trajectory for varying blowing ratios collapsed when scaled by the jet-to-freestream velocity ratio and hole diameter, rd. Similar collapsing was demonstrated in the case of a non-orthogonal jet. Computational Fluid Dynamic (CFD) simulations using the OpenFOAM software was used to compare predictions with select experimental cases, and yielded reasonable agreement. Insight into the importance and structure of the counter rotating vortex pair and general flow field turbulence was highlighted by cross validation between CFD and experimental results.
Show less - Date Issued
- 2015
- Identifier
- CFE0006057, ucf:50992
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006057
- Title
- Coupled Usage of Discrete Hole and Transpired Film For Better Cooling Performance.
- Creator
-
Torrance, Michael, Kapat, Jayanta, Vasu Sumathi, Subith, Xu, Chengying, University of Central Florida
- Abstract / Description
-
Electricity has become so ingrained in everyday life that the current generation has no knowledge of life without it. The majority of power generation in the United States is the result of turbines of some form. With such widespread utilization of these complex rotating machines, any increase in efficiency translates into improvements in the current cost of energy. These improvements manifest themselves as reductions in greenhouse emissions or possible savings to the consumer. The most...
Show moreElectricity has become so ingrained in everyday life that the current generation has no knowledge of life without it. The majority of power generation in the United States is the result of turbines of some form. With such widespread utilization of these complex rotating machines, any increase in efficiency translates into improvements in the current cost of energy. These improvements manifest themselves as reductions in greenhouse emissions or possible savings to the consumer. The most important temperature regarding turbine performance is the temperature of the hot gas entering the turbine, denoted turbine inlet temperature. Increasing the turbine inlet temperature allows for increases in power production as well as increases in efficiency. The challenge with increasing this temperature, currently the hottest temperature seen by the turbine, is that it currently already exceeds the melting point of the metals that the turbine is manufactured from. Active cooling of stationary and rotating components in the turbine is required. Cooling flows are taken from bleed flows from various stages of the compressor as well as flow from the combustor shell. This cooling flow is considered wasted air as far as performance is concerned and can account for as much as 20% of the mass flow in the hot gas path. Lowering the amount of air used for cooling allows for more to be used for performance gain.Various technologies exist to allow for greater turbine inlet temperatures such as various internal channel features inside of turbine blades, film holes on the surface to cool the outside of the airfoil as well as thermal barrier coatings that insulate the airfoils from the hot mainstream flow. The current work is a study of the potential performance impact of coupling two effusion technologies, transpiration and discrete hole film cooling. Film cooling and transpiring flows are individually validated against literature before the two technologies are coupled. The coupled geometries feature 13 film holes of 7.5mm diameter and a transpiring strip 5mm long in the streamwise direction. The first coupled geometry features the porous section upstream of the film holes and the second features it downstream. Both geometries use the same crushed aluminum porous insert of nominal porosity of 50%. Temperature sensitive paint along with an 'adiabatic' Rohacell surface (thermal conductivity of 0.029W/m-K) are used to measure adiabatic film cooling effectiveness using a scientific grade high resolution CCD camera. The result is local effectiveness data up to 50 film hole diameters downstream of injection location. Data is laterally averaged and compared with the baseline cases. Local effectiveness contours are used to draw conclusions regarding the interactions between transpiration and discrete hole film cooling. It is found that a linear superposition method is only valid far downstream from the injection location. Both coupled geometries perform better than transpiration or the discrete holes far downstream of the injection location. The coupled geometry featuring the transpiring section downstream of the film holes matches the transpiration effectiveness just downstream of injection and surpasses both transpiration and film cooling further downstream.
Show less - Date Issued
- 2012
- Identifier
- CFE0004799, ucf:49721
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004799
- Title
- Ode to Amiel: A Micro-budget Experimental Essay Film.
- Creator
-
Redman, Phyllis, Harris, Christopher, Stoeckl, Ula, Schlow, Stephen, University of Central Florida
- Abstract / Description
-
Ode to Amiel is a feature-length experimental essay film by Phyllis Redman, made as part of the requirements for earning a Master of Fine Arts in Film in the Entrepreneurial Digital Cinema track from the University of Central Florida. The film explores one woman's reaction to trauma and depersonalization disorder through the journal entries of 19th Century Swiss philosopher, Henri Frederic Amiel. Passages from Amiel's Journal Intime provide the narrative and voice over for the lead character,...
Show moreOde to Amiel is a feature-length experimental essay film by Phyllis Redman, made as part of the requirements for earning a Master of Fine Arts in Film in the Entrepreneurial Digital Cinema track from the University of Central Florida. The film explores one woman's reaction to trauma and depersonalization disorder through the journal entries of 19th Century Swiss philosopher, Henri Frederic Amiel. Passages from Amiel's Journal Intime provide the narrative and voice over for the lead character, a grieving mother who finds herself locked behind an inescapable, invisible and immaterial barrier that separates her from the outside world.Following the guidelines of the film program, the film was produced on a micro-budget (under $50,000) level. The goal was to create a film that was effectively a no-budget film, one similar in process to that of Tarnation, an award-winning experimental film created for $200. With an actual shooting cost of under $1,000, Ode to Amiel met this challenge.This is the record of the film's progression from development to picture lock, in preparation for distribution.
Show less - Date Issued
- 2015
- Identifier
- CFE0005697, ucf:50121
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005697
- Title
- The Last Two Years of David Brachman: Designing a Feature Film on a Micro Budget.
- Creator
-
Sutphin, Elizabeth, Rusnock, Joseph, Perry, Charles, Cook, Lisa, University of Central Florida
- Abstract / Description
-
This thesis documents my creative process as the Production Designer on the feature length micro budget film The Last Two Years of David Brachman, written and directed by Marc Casilli. The film is a dark comedy chronicling the life of David Brachman, a twenty-five year old with a stagnant life that is seemingly leading nowhere, as he pledges on his twenty-fifth birthday to change the path of his life in the next two years or commit suicide if he fails. The overall design concept of the film...
Show moreThis thesis documents my creative process as the Production Designer on the feature length micro budget film The Last Two Years of David Brachman, written and directed by Marc Casilli. The film is a dark comedy chronicling the life of David Brachman, a twenty-five year old with a stagnant life that is seemingly leading nowhere, as he pledges on his twenty-fifth birthday to change the path of his life in the next two years or commit suicide if he fails. The overall design concept of the film is rooted in realism, but allowed to contain elements that will remove the audience in order to lighten the load of the serious topic of death. With a nod to the 1950s family home and the nostalgia of decades past; David's world is created to show drastic shifts from his inert, routine life at home to the outside working world in to which he thrusts himself. The world outside of David's home is seen through a lens that exemplifies stereotypical social roles and thereby adds to his feelings of outcast and loneliness. Creating the versatile world of David Brachman presented challenges with the amount of locations, characters, and costumes changes; however, these challenges were further complicated by working on an overall micro budget of thirty-six thousand dollars, with approximately fifteen hundred dollars allocated to the art department and costuming. These challenges created a need for resourceful acquisition techniques and budgeting to ensure that the overall artistic vision was not sacrificed. Remaining true to the design aesthetic and the director's vision, my staff and I were able to overcome budgetary challenges, staffing changes that occurred during filming, and shifts in the production dynamic that created a sometimes chaotic filming environment. The careful planning and organization of each design element and their execution ensured the successful creation of David's world and a visual story to compliment the screenplay. Within this thesis I document my design process from my initial design proposal to the director through post production and final viewing of the completed film. Included here are specific details of my design process including script analysis, script breakdowns, location plots, budget tracking, stills from the film, a copy of the finished film, and all the paperwork generated in creating the film. A detailed journal of the filming process including obstacles I encountered as well as the solutions created throughout this process and a self evaluation and reflection on the final product of work are included.
Show less - Date Issued
- 2012
- Identifier
- CFE0004302, ucf:49488
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004302
- Title
- Implementation of Optical Interferometry and Spectral Reflectometry for High Fidelity Thin Film Measurements.
- Creator
-
Arends-Rodriguez, Armando, Putnam, Shawn, Chow, Louis, Kauffman, Jeffrey, University of Central Florida
- Abstract / Description
-
An in-house reflectometer/interferometer has been built to investigate the varying curvature and thickness profiles in the contact line region of air, acetone, iso-octane, ethanol, and water on various types of substrates. Light intensity measurements were obtained using our reflectometer/interferomter and then analyzed in MATLAB to produce thickness and curvature profiles. The apparatus is based on the principle of a reflectometer, consisting of different optical elements, probe, light...
Show moreAn in-house reflectometer/interferometer has been built to investigate the varying curvature and thickness profiles in the contact line region of air, acetone, iso-octane, ethanol, and water on various types of substrates. Light intensity measurements were obtained using our reflectometer/interferomter and then analyzed in MATLAB to produce thickness and curvature profiles. The apparatus is based on the principle of a reflectometer, consisting of different optical elements, probe, light source, and spectrometer. Our reflectometer/interferomter takes measurements in the UV-Vis-IR range (200nm-1000nm). This range is achieved by using a light source that has both a deuterium light (190nm-800nm), a tungsten halogen light (400nm-1100nm), a Metal-Core Printed Circuit Board LED (800nm-1000nm) and a Metal-Core Printed Circuit board cold white LED (400nm-800nm, 6500 K). A UV-VIS-IR spectrometer reads the light response after light is focused on the region of interest. Then a CCD camera (2448x2048) records the profiles for image analyzing interferometry. The readings were then validated based on results in the literature and studies with cylindrical lens samples.
Show less - Date Issued
- 2017
- Identifier
- CFE0006559, ucf:51328
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006559
- Title
- Finding Treasure: The Story of a Micro-budget Digital Film.
- Creator
-
Williamson, Christopher, Mills, Lisa, Burrell, Jason, Sandler, Barry, University of Central Florida
- Abstract / Description
-
Treasure is a feature-length narrative fictional film directed by Chris Williamson as part of the requirements for earning a Master of Fine Arts in Entrepreneurial Digital Cinema from the School of Visual Arts and Design at the University of Central Florida. This thesis is a documentary record of the film production from concept to completion. In this thesis the concerns of authorship are explored from the perspective of the author as the executive producer, writer, and director of the film.
- Date Issued
- 2015
- Identifier
- CFE0005740, ucf:50094
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005740
- Title
- THE DEVELOPMENT OF LOOP-BASED CINEMATIC TECHNIQUES IN TWENTIETH CENTURY MOTION PICTURES AND THEIR APPLICATION IN EARLY DIGITAL CINEMA.
- Creator
-
Scoma, David, Scott, Blake, University of Central Florida
- Abstract / Description
-
For centuries, repetition in one form or another has been seen as a significant element in the artistic palette. In numerous formats of expression, duplication and looping became a significant tool utilized by artisans in a multitude of creative formats. Yet within the realm of film, the Griffith and Eisenstein models of cinematic editing techniques (as the most popular-- and near-monolithic--narrative aesthetic criteria) effectively disregarded most other approaches, including looping....
Show moreFor centuries, repetition in one form or another has been seen as a significant element in the artistic palette. In numerous formats of expression, duplication and looping became a significant tool utilized by artisans in a multitude of creative formats. Yet within the realm of film, the Griffith and Eisenstein models of cinematic editing techniques (as the most popular-- and near-monolithic--narrative aesthetic criteria) effectively disregarded most other approaches, including looping. Despite the evidence for the consistent use of repetition and looping in multiple ways throughout the course of cinematic history, some theorists and practitioners maintain that the influx of the technique within digital cinema in recent years represents a sudden breakthrough, one that has arrived simply because technology has currently advanced to a point where their utilization within digital formats now makes sense both technologically and aesthetically. This situation points to a cyclical problem. Students of film and video frequently are not taught aesthetical or editorial options other than standard industry procedures. Those who are interested in varying techniques are therefore put in the position of having to learn alternative practices on their own. When they do look beyond visual norms to try applying different approaches in their projects, they risk going against the views of their instructors who are only interested in implementations of the standard methods which have been in the forefront for so long. Yet the loop's importance and prevalence as a digital language tool will only likely grow with the evolution of digital cinema. With this is mind, the dissertation addresses the following questions: To what extent can various forms of repetitive visuals be found throughout film history, and are not simply technical manifestations that have merely emerged within digital cinema? How might current educational practices in the realm of film and video work to inform students of techniques outside of the common narrative means? Finally, what other sources or strategies might be available to enlighten students and practitioners exploring both the history surrounding--and possible applications of--techniques based upon early cinema practices such as the loop?
Show less - Date Issued
- 2008
- Identifier
- CFE0002464, ucf:47720
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002464
- Title
- PRELIMINARY STUDY ON THE IMPACT OF IMPINGEMENT ON THE EFFECTIVENESS OF FILM COOLING IN THE PRESENCE OF GAS PATH PRESSURE GRADIENT.
- Creator
-
Peravali, Anil, Kapat, Jayanta, University of Central Florida
- Abstract / Description
-
Impingement is the most commonly used method of cooling in the hot stages of gas turbines. This is often combined with film cooling to further increase the cooling performance. The mainstream flow where in the coolant films discharge often has large stream wise pressure variations. All existing studies on coupled film and impingement cooling concentrated on the effect of the film depletion on the impingement heat transfer. This study investigates the impact of impingement on film cooling,...
Show moreImpingement is the most commonly used method of cooling in the hot stages of gas turbines. This is often combined with film cooling to further increase the cooling performance. The mainstream flow where in the coolant films discharge often has large stream wise pressure variations. All existing studies on coupled film and impingement cooling concentrated on the effect of the film depletion on the impingement heat transfer. This study investigates the impact of impingement on film cooling, where the jets impinging on a flat plate are depleted through arrays of film cooling holes in the presence of pressure gradient in the main gas path. The main characteristic of the test setup is that there is an impingement wall on the backside of the film effusion wall. The fluid used for both impingement flow and main flow is air. The impingement flow is heated as opposed to the usual practice of heating mainflow, and the array of film holes are configured under the impingement jet hole arrays such that there is no direct impingement on the film holes. The static pressure variations and Mach number (0.01 to 0.3) in the mainstream underneath the flat plate are controlled by inserts with varying flow area. The detailed temperature distribution on the film-covered surface is measured using the Temperature Sensitive Paint (TSP) technique, and film cooling effectiveness is calculated from the measurements. Results are presented for averaged impingement jet Reynolds numbers of 5000 and 8000. The effect of impingement on film effectiveness is studied by comparing the results from the two cases: one where film flow is directly supplied from a plenum and the other where the post- impingement flow is depleted through film effusion holes. The results are presented for cylindrical film cooling holes which are inclined at angles of 20 deg and 30 deg with respect to the target plate surface. The variation of the effectiveness of the film hole arrays along the mainstream are studied in detail. It is observed that the impingement through jet effects the pressure distribution on the target plate with film holes, which in turn affects the blowing rates of each row. The change in the blowing ratios because of a different pressure distribution on the impingement side of the target plate causes the effectiveness to change. From the results it is observed that the farther rows of impingement are affected by the pressure distribution underneath the film holes and have more flow through the film cooling rows, this increases the inlet flow of the films which increase the blowing ratios and in turn decreases the effectiveness of the film cooling holes. The pressure distribution and the change of effectiveness are studied in detail.
Show less - Date Issued
- 2006
- Identifier
- CFE0001445, ucf:47056
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001445
- Title
- STUDY OF DISCHARGE COEFFICIENT AND TRENDS IN FILM COOLING EFFECTIVENESS OF CONICAL HOLES WITH INCREASING DIFFUSION ANGLES.
- Creator
-
Zuniga, Humberto, Kapat, Jayanta, University of Central Florida
- Abstract / Description
-
Previous studies indicate that increasing the diffusion angle in conical film-cooling holes leads to an improvement in their film cooling effectiveness. Discharge coefficient and film cooling effectiveness measurements are conducted to characterize this behavior. Part of the focus of this investigation is to find out how this trend develops and attempt to ascertain the optimum cone angle, if possible. Six test plates, each with one row of eight conical-shaped cooling holes of equal diffusion...
Show morePrevious studies indicate that increasing the diffusion angle in conical film-cooling holes leads to an improvement in their film cooling effectiveness. Discharge coefficient and film cooling effectiveness measurements are conducted to characterize this behavior. Part of the focus of this investigation is to find out how this trend develops and attempt to ascertain the optimum cone angle, if possible. Six test plates, each with one row of eight conical-shaped cooling holes of equal diffusion angles of 0, 1, 2, 3, 6, or 8º, with respect to the hole axis are used in this study. The ratios of the hole exit areas to the inlet areas range from 1 to 2.85. Coolant injection angle for all holes is at 35 degrees to the horizontal, in the direction of the main flow. Coefficients of discharge of all holes are reported under flow conditions. Temperature sensitive paint, TSP, is the technique used to find the temperature distribution downstream of the cooling holes and determine the laterally averaged film-cooling effectiveness. Data are obtained for blowing ratios ranging from 0.5 to 1.5, at a constant density ratio of 1.26. Results and trends are compared with established literature, which also recommends that a cylindrical entry length for diffused holes should be at least 4 diameters long. The effect that an added entry length has on the 3-degree conical plate's cooling effectiveness is also explored. Data are compared to baseline cylindrical holes, as well as to fan-shaped film holes found in open literature. Results indicate that the conical holes with larger diffusion angles provide strikingly even film protection and outperform fan shaped and cylindrical holes under certain conditions over extended downstream distances. Also, the addition of a cylindrical entry length to a conical hole, by providing a manageable metering diameter, should ease their usage while providing the full benefits of the conical geometry which may one day lead to numerous industrial applications.
Show less - Date Issued
- 2006
- Identifier
- CFE0001492, ucf:47087
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001492
- Title
- THE ACCOMPANIED EXPERIENCE AND THE AESTHETICS OF MEMORY.
- Creator
-
Dickerson, Allyson, Harris, Christopher, University of Central Florida
- Abstract / Description
-
For me, a memory is the thought of a feeling. Feeling, in this case, is the appreciable radiation of sensory emanating from all objects and persons in a given moment of time. "All thought, like all feeling, is a relationship between one human being and another human being or certain objects which form a part of his universe" (Astruc). Be it an instance of attraction to another person, a place, a creation, an object, or purely an aesthetic pleasure, said instance will become ingrained as a...
Show moreFor me, a memory is the thought of a feeling. Feeling, in this case, is the appreciable radiation of sensory emanating from all objects and persons in a given moment of time. "All thought, like all feeling, is a relationship between one human being and another human being or certain objects which form a part of his universe" (Astruc). Be it an instance of attraction to another person, a place, a creation, an object, or purely an aesthetic pleasure, said instance will become ingrained as a part of an aggregation of moment-to-moment experiences that form an individual's universe and lifetime of perceptions. Through film, I hope to give a visual tangibility for such feelings, a re-playable, and relatively more permanent, representation. It's a process similar to the way a headstone memorializes a life. A few words in stone could never measure up to the present time of actually living, but this is because they are not comparable. In much the same way, a synthesized montage of images cannot be compared to a memory, but should be used as way to experience the memory in a new way.
Show less - Date Issued
- 2014
- Identifier
- CFH0004613, ucf:45277
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004613
- Title
- Chemistry and(&)nbsp;Structure of Ru/SiO2(&)nbsp;and Ru/Al2O3 Interfaces.
- Creator
-
Ezzat, Sameer, Campiglia, Andres, Coffey, Kevin, Zou, Shengli, Frazer, Andrew, Harper, James, Coffey, Kevin, University of Central Florida
- Abstract / Description
-
The resistivity size effect in nanoscale metals is of both scientific and technological interest, the latter due to its importance to interconnects between transistors in integrated circuits. In this work we report the variation of resistivity associated with surface scattering of ex-situ annealed single crystal Ru thin films grown on sapphire substrates by sputter deposition. A set of samples were overcoated with dielectric and subjected to a variety of reducing and oxidizing anneals. The...
Show moreThe resistivity size effect in nanoscale metals is of both scientific and technological interest, the latter due to its importance to interconnects between transistors in integrated circuits. In this work we report the variation of resistivity associated with surface scattering of ex-situ annealed single crystal Ru thin films grown on sapphire substrates by sputter deposition. A set of samples were overcoated with dielectric and subjected to a variety of reducing and oxidizing anneals. The changes in the chemistry and structure of the dielectric interface induced by the anneals, as determined by x-ray reflectivity and x-ray photoelectron spectroscopy measurements, are related to the changes in the specularity of the surface for electron scattering in the context of the Fuchs-Sondheimer semi-classical model of the resistivity size effect.
Show less - Date Issued
- 2019
- Identifier
- CFE0007454, ucf:52727
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007454
- Title
- Surface Measurements and Predictions of Full-Coverage Film Cooling.
- Creator
-
Natsui, Gregory, Kapat, Jayanta, Raghavan, Seetha, Vasu Sumathi, Subith, University of Central Florida
- Abstract / Description
-
Full-coverage film cooling is investigated both experimentally and numerically. First,surface measurements local of adiabatic film cooling eeffectiveness and heat transfer augmentation for four different arrays are described. Reported next is a comparison between two very common turbulence models, Realizable k-epsilon and SST k-omega, and their ability to predict local film cooling effectiveness throughout a full-coverage array.The objective of the experimental study is the quantification of...
Show moreFull-coverage film cooling is investigated both experimentally and numerically. First,surface measurements local of adiabatic film cooling eeffectiveness and heat transfer augmentation for four different arrays are described. Reported next is a comparison between two very common turbulence models, Realizable k-epsilon and SST k-omega, and their ability to predict local film cooling effectiveness throughout a full-coverage array.The objective of the experimental study is the quantification of local heat transferaugmentation and adiabatic film cooling effectiveness for four surfaces cooled by large, both in hole count and in non-dimensional spacing, arrays of film cooling holes. The four arrays are of two different hole-to-hole spacings (P=D = X=D = 14.5; 19.8) and two different hole inclination angles (alpha = 30°; 45°), with cylindrical holes compounded relative to the flow(beta = 45°) and arranged in a staggered configuration. Arrays of up to 30 rows are tested so that the superposition effect of the coolant film can be studied. In addition, shortened arrays of up to 20 rows of coolant holes are also tested so that the decay of the coolant film following injection can be studied.Levels of laterally averaged effectiveness reach values as high as η = 0.5, and are not yet at the asymptotic limit even after 20 - 30 rows of injection for all cases studied. Levels of heat transfer augmentation asymptotically approach values of h=h0 ≈ 1.35 rather quickly, only after 10 rows. It is conjectured that the heat transfer augmentation levels off very quickly due to the boundary layer reaching an equilibrium in which the perturbation from additional film rows has reached a balance with the damping effect resulting from viscosity. The levels of laterally averaged adiabatic film cooling effectiveness far exceeding eta = 0.5 aremuch higher than expected. The heat transfer augmentation levels off quickly as opposed tothe film effectiveness which continues to rise (although asymptotically) at large row numbers. This ensures that an increased row count represents coolant well spent.The numerical predictions are carried out in order to test the ability of the two mostcommon turbulence models to properly predict full-coverage film cooling. The two models chosen, Realizable k-epsilon (RKE) and Shear Stress Transport k-omega (SSTKW), areboth two-equation models coupled with Reynolds Averaged governing equations which makeseveral gross physical assumptions and require several empirical values. Hence, the modelsare not expected to provide perfect results. However, very good average values are seen tobe obtained through these simple models. Using RKE in order to model full-coverage filmcooling will yield results with 30% less error than selecting SSTKW.
Show less - Date Issued
- 2012
- Identifier
- CFE0004580, ucf:49221
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004580
- Title
- OPTIMIZATION OF PROCESS PARAMETERS FOR REDUCED THICKNESS CIGSES THIN FILM SOLAR CELLS.
- Creator
-
Pethe, Shirish, Dhere, Neelkanth, University of Central Florida
- Abstract / Description
-
With the advent of the 21st century, one of the serious problems facing mankind is harmful effects of global warming. Add to that the ever increasing cost of fuel and the importance of development of clean energy resources as alternative to fossil fuel has becomes one of the prime and pressing challenges for modern science and technology in the 21st century. Recent studies have shown that energy related sources account for 50% of the total emission of carbon dioxide in the atmosphere. All...
Show moreWith the advent of the 21st century, one of the serious problems facing mankind is harmful effects of global warming. Add to that the ever increasing cost of fuel and the importance of development of clean energy resources as alternative to fossil fuel has becomes one of the prime and pressing challenges for modern science and technology in the 21st century. Recent studies have shown that energy related sources account for 50% of the total emission of carbon dioxide in the atmosphere. All research activities are focused on developing various technologies that are capable of converting sunlight into electricity with high efficiency and can be produced using a cost-effective process. One of such technologies is the CuIn1-xGaxSe2 (CIGS) and its alloys that can be produced using cost-effective techniques and also exhibit high photo-conversion efficiency. The work presented here discusses some of the fundamental issues related to high volume production of CIGS thin film solar cells. Three principal issues that have been addressed in this work are effect of reduction in absorber thickness on device performance, micrononuniformity involved with amount of sodium and its effect on device performance and lastly the effect of working distance on the properties of molybdenum back contact. An effort has been made to understand the effect of absorber thickness on PV parameters and optimize the process parameters accordingly. Very thin (<1 µm) absorber film were prepared by selenization using metallorganic selenium source in a conventional furnace and by RTP using Se vapor. Sulfurization was carried out using H2S gas. Devices with efficiencies reaching 9% were prepared for very thin (<1 µm) CIGS and CIGSeS thin films. It was shown through this work that the absorber thickness reduction of 64% results in the efficiency drop of only 32%. With further optimization of the reaction process of the absorber layer as well as the other layers higher efficiencies can be achieved. The effect of sodium on the device performance is experimentally verified in this work. To the best of our knowledge the detrimental effect of excess sodium has been verified by experimental data and effort has been made to correlate the variation in PV parameter to theoretical models of effect of sodium. It has been a regular practice to deposit thin barrier layer prior to molybdenum deposition to reduce the micrononuniformities caused due to nonuniform out diffusion of sodium from the soda lime glass. However, it was proven in this work that an optimally thick barrier layer is necessary to reduce the out diffusion of sodium to negligible quantities and thus reduce the micrononuniformities. Molybdenum back contact deposition is a bottleneck in high volume manufacturing due to the current state of art where multi layer molybdenum film needs to be deposited to achieve the required properties. In order to understand and solve this problem experiments were carried out. The effect of working distance (distance between the target and the substrate) on film properties was studied and is presented in this work. During the course of this work efforts were taken to carry out a systematic and detailed study of some of the fundamental issues related to CIGS technology and particular for high volume manufacturing of CIGS PV modules and lay a good foundation for further improvement of PV performance of CIGS thin film solar cells prepared by the two step process of selenization and sulfurization of sputtered metallic precursors.
Show less - Date Issued
- 2010
- Identifier
- CFE0003517, ucf:48940
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003517
- Title
- The Decorruption: The Making of a Political Satire.
- Creator
-
Garcia Velasquez, Maria, Mills, Lisa, Harris, Christopher, Peterson, Lisa, University of Central Florida
- Abstract / Description
-
The Decorruption is a feature-length fiction film directed by Mar(&)#237;a Garc(&)#237;a, made as partof the requirements for earning a Master of Fine Arts in Entrepreneurial Digital Cinema from the University of Central Florida. The film is a political satire, which tells the story of a country plagued by corruption, where a rebellious government employee discovers that death is the only solution to the problem, so she sets out on a killing spree against the corrupt.The film was produced on...
Show moreThe Decorruption is a feature-length fiction film directed by Mar(&)#237;a Garc(&)#237;a, made as partof the requirements for earning a Master of Fine Arts in Entrepreneurial Digital Cinema from the University of Central Florida. The film is a political satire, which tells the story of a country plagued by corruption, where a rebellious government employee discovers that death is the only solution to the problem, so she sets out on a killing spree against the corrupt.The film was produced on a microbudget (under $50,000) level, following the program's guidelines. It was shot in Ecuador with non-professional actors and a minimalistic production style. This thesis is a record of the film's progression from development to picture lock, in preparation for distribution.
Show less - Date Issued
- 2013
- Identifier
- CFE0004998, ucf:49556
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004998
- Title
- A Full Coverage Film Cooling Study: The Effect of an Alternating Compound Angle.
- Creator
-
Hodges, Justin, Kapat, Jayanta, Gordon, Ali, Vasu Sumathi, Subith, University of Central Florida
- Abstract / Description
-
This thesis is an experimental and numerical full-coverage film cooling study. The objective of this work is the quantification of local heat transfer augmentation and adiabatic film cooling effectiveness for two full-coverage film cooling geometries. Experimental data was acquired with a scientific grade CCD camera, where images are taken over the heat transfer surface, which is painted with a temperature sensitive paint. The CFD component of this study served to evaluate how well the v2-f...
Show moreThis thesis is an experimental and numerical full-coverage film cooling study. The objective of this work is the quantification of local heat transfer augmentation and adiabatic film cooling effectiveness for two full-coverage film cooling geometries. Experimental data was acquired with a scientific grade CCD camera, where images are taken over the heat transfer surface, which is painted with a temperature sensitive paint. The CFD component of this study served to evaluate how well the v2-f turbulence model predicted film cooling effectiveness throughout the array, as compared with experimental data. The two staggered arrays tested are different from one another through a compound angle shift after 12 rows of holes. The compound angle shifts from ?=-45(&)deg; to ?=+45(&)deg; at row 13. Each geometry had 22 rows of cylindrical film cooling holes with identical axial and lateral spacing (X/D=P/D=23). Levels of laterally averaged film cooling effectiveness for the superior geometry approach 0.20, where the compound angle shift causes a decrease in film cooling effectiveness. Levels of heat transfer augmentation maintain values of nearly h/h0=1.2. There is no effect of compound angle shift on heat transfer augmentation observed. The CFD results are used to investigate the detrimental effect of the compound angle shift, while the SST k-? turbulence model shows to provide the best agreement with experimental results.
Show less - Date Issued
- 2015
- Identifier
- CFE0005626, ucf:50228
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005626
- Title
- Examining the Narcissism Trend in Generation Y Through Digital Narrative Film.
- Creator
-
Ingle, Joshua, Jones, Robert, Peters, Philip, Peterson, Lisa, University of Central Florida
- Abstract / Description
-
This thesis presents an account of the making of 15 Minutes of Faye, a microbudget feature-length film created in partial fulfillment of the requirements for the degree of Master of Fine Arts in Film and Digital Media at the University of Central Florida. It chronicles the motivation behind the creation of the film, the entire creation process, plans for its distribution, and reflections on lessons learned during the creation process. The film itself was designed to challenge its viewers with...
Show moreThis thesis presents an account of the making of 15 Minutes of Faye, a microbudget feature-length film created in partial fulfillment of the requirements for the degree of Master of Fine Arts in Film and Digital Media at the University of Central Florida. It chronicles the motivation behind the creation of the film, the entire creation process, plans for its distribution, and reflections on lessons learned during the creation process. The film itself was designed to challenge its viewers with the gross self-absorption of its fame-seeking protagonist, in order to promote public discourse about Generation Y's sense of entitlement, which has been well-documented in academic literature. It is the author's hope that this document will promote awareness of the film's subject matter, and will also aid others seeking to create microbudget feature-length films.
Show less - Date Issued
- 2014
- Identifier
- CFE0005185, ucf:50643
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005185
- Title
- Testament: Mastering and Transcending the Microbudget Model for a Feature Film.
- Creator
-
Ritter, Timothy, Mills, Lisa, Shults, Katherine, Sandler, Barry, University of Central Florida
- Abstract / Description
-
Testament is a feature film serving as part of Tim Ritter's thesis requirements for earning a Master of Fine Arts in the Entrepreneurial Digital Cinema program at the University of Central Florida. The film follows a bitter former follower of a marginally popular social-justice movement who must keep the movement alive after its mysterious leader is killed violently and publicly. The drama, set in an fictional land known as The Commonwealth, presents a modern-day retelling of the life of St....
Show moreTestament is a feature film serving as part of Tim Ritter's thesis requirements for earning a Master of Fine Arts in the Entrepreneurial Digital Cinema program at the University of Central Florida. The film follows a bitter former follower of a marginally popular social-justice movement who must keep the movement alive after its mysterious leader is killed violently and publicly. The drama, set in an fictional land known as The Commonwealth, presents a modern-day retelling of the life of St. Peter in the years after the death of Jesus, creating a new context for familiar Biblical tales and morals while also examining the high personal costs of changing the world.Testament has been produced for well under $50,000 as part of the microbudget requirements of the UCF Film program. In creating an epic with minimal resources, innovation has filled the void left by most films' higher budgets, with the crew recycling a small number of locations to serve as several different locations and using a large cast sparingly to avoid becoming overly reliant on many actors who aren't getting paid. This document details the theories and methodology behind the preparation and planned production of the film, as well as the approach planned for its distribution.
Show less - Date Issued
- 2015
- Identifier
- CFE0005702, ucf:50145
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005702
- Title
- PROCESSING AND CHARACTERIZATION OF MULTIFUNCTIONAL THERMOPLASTIC NANOCOMPOSITE FILMS.
- Creator
-
Wang, Xin, Gou, Jihua, Challapalli, Suryanarayana, Xu, Yunjun, University of Central Florida
- Abstract / Description
-
Nanoparticles reinforced polymer composite films have been widely studied for their enhanced mechanical, electrical and thermal properties compared with host polymer matrix. However, most research was conducted on incorporation of nanoparticles in polymer films to improve single property and there is a lack of research on the multifunctional polymer nanocomposite films. In this work, a scalable and continuous spray deposition process was developed for the production of nanoparticles...
Show moreNanoparticles reinforced polymer composite films have been widely studied for their enhanced mechanical, electrical and thermal properties compared with host polymer matrix. However, most research was conducted on incorporation of nanoparticles in polymer films to improve single property and there is a lack of research on the multifunctional polymer nanocomposite films. In this work, a scalable and continuous spray deposition process was developed for the production of nanoparticles reinforced multifunctional thermoplastic nanocomposite films. This process is capable of making a thin sheet of thermoplastic nanocomposites with high nanoparticle loadings. The smallest thickness can be 40um.The objective of this study is to design and optimize the thermoplastic nanocomposite films by utilizing nanoclay and helical carbon nanotube for multifunctional application: a) high electrical conductivity and thermal stability. Helical carbon nanotube paper based thermoplastic polyurethane nanocomposite films have been studied. The electrical conductivity and thermal stability of nanocomposite films increase a lot due to the incorporation of helical carbon nanotube paper with high electrical and thermal conductivity. The peculiar helical configuration of carbon nanotubes could greatly improve the interfacial bonding between carbon nanotubes and polymer matrix. b)High wear resistance and thermal stability. A nanoclay reinforced thermoplastic polyurethane nanocomposite coating was applied on the surface of leather. Due to the high hardness and thermal stability of nanoclay, the leather coated with nanocomposite film showed an improvement of wear resistance and thermal stability.
Show less - Date Issued
- 2014
- Identifier
- CFE0005734, ucf:50105
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005734
- Title
- LITTLE WOMEN: STUDY OF FEMALE REPRESENTATIONS IN TEEN FILMS AND HOW THOSE REPRESENTATIONS HAVE AFFECTED GENDER PERCEPTIONS.
- Creator
-
Santiago, Maillim, Gay, Andrew, University of Central Florida
- Abstract / Description
-
Although teen film is littered with tales of young women coming of age, the messages presented in most of these films follow a formula centered on a patriarchal nuclear family ideal, which leads to damaging perceptions regarding gender roles in teenage society. There is the main traditional model of stay at home mother with a father in the role of the breadwinner; the rise of rape culture; and the glass ceiling in the workplace. The young females consuming a mass amount of this media then...
Show moreAlthough teen film is littered with tales of young women coming of age, the messages presented in most of these films follow a formula centered on a patriarchal nuclear family ideal, which leads to damaging perceptions regarding gender roles in teenage society. There is the main traditional model of stay at home mother with a father in the role of the breadwinner; the rise of rape culture; and the glass ceiling in the workplace. The young females consuming a mass amount of this media then reflect negatively on themselves. The research following this conundrum was broken into two parts: the production of a film looking to remedy the many problems of female representation in teen media and then monitoring the reaction to said film against its target audience: young females between the ages of fifteen and twenty-one. The purpose of this thesis is to explore what makes females within the teenage demographic react to certain kinds of media. If they react negatively or positively towards a media representation of themselves, to what extent does this affect the participants' activity in their daily lives? Therefore, through a process of screening three short films focused on teen issues - including the one made by myself for this study - and then conducting a survey focusing on questions regarding the participants' feelings towards the subject matter, their hopes for themselves, and teen media in general, there was an ability to gauge how deeply teen media affects the modern teenager.
Show less - Date Issued
- 2013
- Identifier
- CFH0004382, ucf:45009
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004382
- Title
- Whatever Happened to Blackwater RD.?: A Visual Documentary Concerning Achievement in the Face of Failure.
- Creator
-
Stephenson, Michael, Stoeckl, Ula, Sandler, Barry, Shults, Katherine, University of Central Florida
- Abstract / Description
-
Whatever happened to Blackwater RD.? is a feature length documentary thesis film created and cultivated by Michael E. Stephenson to fulfill the requirements of the Master of Fine Arts degree in Entrepreneurial Digital Cinema while attending the University of Central Florida. Whatever happened to Blackwater RD.? has met these criteria of the School of Visual Arts and Design, in the College of Arts and Humanities, by being a feature length digital film with a budget no larger than $50,000. This...
Show moreWhatever happened to Blackwater RD.? is a feature length documentary thesis film created and cultivated by Michael E. Stephenson to fulfill the requirements of the Master of Fine Arts degree in Entrepreneurial Digital Cinema while attending the University of Central Florida. Whatever happened to Blackwater RD.? has met these criteria of the School of Visual Arts and Design, in the College of Arts and Humanities, by being a feature length digital film with a budget no larger than $50,000. This film is the efforts of the filmmaker to trace the failure of his original narrative thesis film Blackwater RD., attempting to discover where everything went wrong while trying to recover from such a crushing defeat. Assembled from behind the scene videos and interviews, this film represents a collected effort to discover a way to make digital cinema from multiple sources, ranging from digital cameras to smartphones, while still crafting a singular vision. Digital cinema allows for films to be made in a collage-like effort to explore how narrative can be manipulated and how a director may steer it, even in the documentary field. Through the exploration of his own failings the filmmaker has discovered perhaps the most important lesson of both academia and film: failure is always an option. To fail is a life worthy experience that one should learn from and utilize in accomplishing future tasks.
Show less - Date Issued
- 2018
- Identifier
- CFE0007104, ucf:51950
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007104
