Numerical Modeling Of An Alloy Droplet Deposition With Non-Equilibrium Solidification,
2016
University of Texas at Arlington
Numerical Modeling Of An Alloy Droplet Deposition With Non-Equilibrium Solidification, Vimal Ramanuj
Mechanical and Aerospace Engineering Dissertations - Archive
Droplet deposition is a process of extensive relevance to the microfabrication industry. Various bonding and film deposition methods utilize single or multiple droplet impingements on a substrate with subsequent splat formation through simultaneous spreading and solidification. Splat morphology and solidification characteristics play vital roles in determining the final outcome. Experimental methods have limited reach in studying such phenomena owing to the extremely small time and length scales involved. Fundamental understanding of the governing principles of fluid flow, heat transfer and phase change provide effective means of studying such processes through computational techniques. The present study aims at numerically modeling and …
Enhanced Specific Heat Of Molten Salt Nanofluids,
2016
University of Texas at Arlington
Enhanced Specific Heat Of Molten Salt Nanofluids, Hani Tiznobaik
Mechanical and Aerospace Engineering Dissertations - Archive
Concentrated solar power uses general thermodynamic cycles (such as Rankine or Gas turbine cycle) to produce electricity and thus its efficiency primarily relies on the operating temperature of thermal energy storage. Current thermal energy storage medium is organic material such as synthetic oil or fatty acid. However, these materials are not stable at high temperatures due to their thermal decomposition. Using molten salts as thermal energy storage medium is a very attractive option since they are thermally stable at high temperatures (over 600 °C). They also have very lower vapor pressure (for reducing mechanical stress on structure materials), less reactive, …
Data Engineering In Aerospace Systems Design & Forecasting,
2016
University of Texas at Arlington
Data Engineering In Aerospace Systems Design & Forecasting, Eric Haney
Mechanical and Aerospace Engineering Dissertations - Archive
Although engineers spend the majority of their time finding, managing, and transforming data, the process of how to handle data remains under-educated & under-researched. The alignment of engineering education & proficiency along an analysis-dominated mindset is ill-conditioned for the growing reliance on data-driven processes and holistic decision-making requirements. Although a majority of driving decisions in the aerospace industry rely heavily on utilizing existing organizational data-stores and built-in knowledge bases to make informed decisions, formalized development & implementation of data within existing engineering processes is seldom addressed. The current research defines a complementary discipline, Data-Engineering, which seeks to capitalize on the …
Exergy Analysis Of A Pulse Detonation Engine Linear Power Generator,
2016
University of Texas at Arlington
Exergy Analysis Of A Pulse Detonation Engine Linear Power Generator, Raheem Temitope Bello
Mechanical and Aerospace Engineering Dissertations - Archive
The fuel efficiency of a power generator is a key metric for evaluating its performance. The common engineering practice is to determine the thermal efficiency of the system by applying the conservation of energy also known as the first law of thermodynamics. However, for heat engine power generators, and other thermal systems, the thermal efficiency is not sufficient for detailed system performance analysis. Exergy analysis, which applies both the first and second law of thermodynamics, enables the determination of the directionality of thermal processes, and the system’s available work. This more complete thermodynamic analysis approach is applied to a pulse …
Maximizing Use Of Air-Side Economization, Direct And Indirect Evaporative Cooling For Energy Efficient Data Centers,
2016
University of Texas at Arlington
Maximizing Use Of Air-Side Economization, Direct And Indirect Evaporative Cooling For Energy Efficient Data Centers, Betsegaw Kebede Gebrehiwot
Mechanical and Aerospace Engineering Dissertations - Archive
Data centers house information technology (IT) equipment such as servers and network switches which are vital for our networked modern society by providing digital data storage, data processing and connectivity. Data centers house few hundreds to tens of thousands of IT equipment that consume few kilowatt-hours to multi-megawatt-hours of electrical energy that gets dissipated as heat. IT equipment need to be properly cooled so that they operate reliably for their expected lifetime. For air cooled IT equipment, manufacturers provide heat sinks, cold plates, fans, et cetera to remove heat from the vicinity of heat dissipating components and data centers need …
Human Robot Interaction With 3d-Printed Whole Body Robotic Skin,
2016
University of Texas at Arlington
Human Robot Interaction With 3d-Printed Whole Body Robotic Skin, Fahad Mirza
Mechanical and Aerospace Engineering Theses - Archive
This thesis presents work of a newly developed pressure sensor for robot skin, from fabrication to application. Robot skin similar to human skin meant to have several sensing capabilities including pressure, temperature etc. As the conventional semiconductor manufacturing process is not adequate for multi-modal sensors, a new process, called Electro-Hydro-Dynamic Printing, has been explored in this work. A calibration technique was implemented along with printing parameter fixation by trial and error. A testing methodology was proposed to test these sensors and several commercial robots were used to conduct pHRI experiments with pressure sensing capability.
Finite Element Based Cross-Sectional Buckling Optimization For A Constant Area, Pinned-Pinned Composite Column,
2016
University of Texas at Arlington
Finite Element Based Cross-Sectional Buckling Optimization For A Constant Area, Pinned-Pinned Composite Column, Anirudh Srinivas
Mechanical and Aerospace Engineering Theses - Archive
In archery, dynamic buckling compromises the target accuracy of arrows. For both dynamic and quasi-static buckling, the buckling load depends on the cross-sectional area moment of inertia, which can be increased by modifying the cross-sectional shape of the arrow shaft. Arrows commercially available today are made up of composite materials and have a tubular circular cross-section. In this study an effort has been made to optimize the cross-sectional shape of the composite arrow shaft, using finite element based, quasi-static buckling analysis keeping the length and area of the cross-section constant. The composite column is pinned at both ends and is …
Human Robot Interaction Using Knowledge Base Approach,
2016
University of Texas at Arlington
Human Robot Interaction Using Knowledge Base Approach, Utsav Shah
Mechanical and Aerospace Engineering Theses - Archive
This research investigated Human Robot Interaction modalities. The performance of a robotic prosthetic hand (RPH) was used as a test bed robot. A user wearable glove was fitted with sensors to provide tele-control of the RPH. An open hardware control and easily expandable research platform based on LabVIEW software and myRIO control hardware was developed. LabVIEW graphical programming platform provides the tools for the development to customized interfaces for visualization purposes which is desired in research. The research platform was used to calibrate and control the operation of the artificial hand using various modalities such as open loop, glove master-slave …
E-Learning Modules For Nuclear Reactor Heat Transfer,
2016
University of Texas at Arlington
E-Learning Modules For Nuclear Reactor Heat Transfer, Praveen Bharadwaj Jayaram
Mechanical and Aerospace Engineering Theses - Archive
E learning in engineering education is becoming popular at several universities as it allows instructors to create content that the students may view and interact with at his/her own convenience. Web-based simulation and what-if analysis are examples of such educational content and has proved to be extremely beneficial for engineering students. Such pedagogical content promote active learning and encourage students to experiment and be more creative. The main objective of this project is to develop web based learning modules, in the form of analytical simulations, for the Reactor Thermal Hydraulics course offered by the College of Engineering at UT Arlington. …
Experimental And Numerical Study Of Marangoni Convection In A Sandwiched Droplet,
2016
University of Texas at Arlington
Experimental And Numerical Study Of Marangoni Convection In A Sandwiched Droplet, Ajinkya Shrikrishna Shetye
Mechanical and Aerospace Engineering Theses - Archive
This research studies velocity fields resulted from the marangoni effect in a microscale droplet sandwiched in parallel plates. Surface tension becomes the dominant driving force as opposed to body forces as we move from the macroscale to microscale. Surface tension gradient is required to generate marangoni convection. This could be produced by a temperature gradient along the meniscus of the drop. To study this interfacial phenomenon, indium tin oxide micro thin film heater is utilized to create the necessary temperature gradient. Pure marangoni effect is studied by suppressing the evaporation effect on fluid flow by using an ionic liquid (molten …
Computational Analysis Of Blast Induced Damage On Neurons In Brain During Traumatic Brain Injury,
2016
University of Texas at Arlington
Computational Analysis Of Blast Induced Damage On Neurons In Brain During Traumatic Brain Injury, Divya Swamy Bandaru
Mechanical and Aerospace Engineering Theses - Archive
Concussions are the most common kind of brain injuries, they are also called as mild Traumatic Brain Injuries (mTBI). In recent times, mTBIs are perceived as one of the major health problems faced by millions across the world. TBIs occur when there is a sudden acceleration or deceleration force is applied on the human brain that is encapsulated in the skull. When blasts caused by typical IEDs (induced by explosives) in wars propagate through the head, cavitation bubbles are formed in the brain tissue. When these bubbles collapse, they form cavitation-induced shock wave. It has been found that the strains …
Image Processing Of Triple Shock Wave Evolution,
2016
University of Texas at Arlington
Image Processing Of Triple Shock Wave Evolution, Katherine Yarbrough
Mechanical and Aerospace Engineering Theses - Archive
Shock diamonds occur in over- or under- expanded supersonic flow. They occur in the unsteady jet of a pulse detonation engine, displaying an array of complex features. Due to the highly transient nature of the flow, it must be captured using high-speed cinematography. A study of image processing of shock reflection in unsteady flow is presented. Using a computer-based environment, a method was developed to process images of shock waves to pinpoint where the shock wave starts. Using mathematical methods, such as Abel transforms, a computer code, written in Matlab, was developed to accurately transform the images to detect density …
Experimental Characterization Of Hybrid Cooled Cisco Servers Including The Effect Of Warm Water Cooling,
2016
University of Texas at Arlington
Experimental Characterization Of Hybrid Cooled Cisco Servers Including The Effect Of Warm Water Cooling, Md Malekkul Islam
Mechanical and Aerospace Engineering Theses - Archive
The information technology (IT) owners are experiencing a greater cooling challenge because of the increase in power density due to modern computational needs. The non-uniform power density in each server is forcing the industry to use hybrid cooling technology. Server components of different cooling requirement needs air water hybrid cooling which offers variable design alternatives. Such hybrid cooling technology cools the high heat generating components by using water or water based fluid, whereas, the rest of the components are cooled by air using internal fans. Conventional air cooling is more than sufficient for the components with less thermal demand. Air …
Performance Enhancement Of Raspberry Pi Server For The Application Of Oil Immersion Cooling,
2016
University of Texas at Arlington
Performance Enhancement Of Raspberry Pi Server For The Application Of Oil Immersion Cooling, Dhaval Hitendra H Thakkar
Mechanical and Aerospace Engineering Theses - Archive
The power consumed by Central Processing Unit (CPU) generates the heat which is undesirable and which is further responsible for the damage of Information Technology equipment. Oil Immersion cooling is one of the emerging technology which deals with the high server densities by submersing the servers in mineral oil. The study addresses the CFD analysis of Raspberry Pi computer servers with different cooling techniques and different modes of operating conditions. The thesis gives the explanation on the difference between air cooling and oil cooling with and without use of heat sinks. The study also shows the parametric analysis of heat …
Parametric Cycle Analysis Of Adaptive Cycle Engine,
2016
University of Texas at Arlington
Parametric Cycle Analysis Of Adaptive Cycle Engine, Harinkumar Rajendrabhai Patel
Mechanical and Aerospace Engineering Theses - Archive
One of the main area of research currently in air-breathing propulsion is increasing the fuel efficiency of engines. Increasing fuel efficiency of an air-breathing engine will be advantageous for civil transport as well as military aircraft. This objective can be achieved in several ways. Present design models are developed based on their uses: commercial transport, high range rescue aircraft, military aircraft. One of the main property of military aircraft is possessing high thrust but increasing fuel efficiency will also be advantageous resulting in more time in combat. Today's engine design operates best at their design point and has reduced thrust …
Finite Element Based Weight Reduction Subject To Stability Constraints For An Airship Composite Duct,
2016
University of Texas at Arlington
Finite Element Based Weight Reduction Subject To Stability Constraints For An Airship Composite Duct, Soham M. Umbrajkar
Mechanical and Aerospace Engineering Theses - Archive
The primary functions of High Altitude Long Endurance (HALE) airships are persistent observation and wide area direct line of sight communication. Traditional airships have an ellipsoidal type hull, which is characterized by a large aspect ratio but results in an increase in the weight of the envelope. In order to reduce the weight of an airship, a hull having lower aspect ratio would be preferred. A novel unconventional airship design having a toroidal geometry with a propulsive duct running from the front end to back end was developed by Dancila in an attempt to achieve this objective. The propulsive duct …
A Study Of Electrical Double Layer At An Aluminum Surface In An Automotive Cooling System,
2016
University of Texas at Arlington
A Study Of Electrical Double Layer At An Aluminum Surface In An Automotive Cooling System, Saurabh Deobhankar
Mechanical and Aerospace Engineering Theses - Archive
Electrolytic corrosion is identified as a major problem which adversely affects the performance of a cooling system and hence compromises the performance of automobile with it. Electrolysis corrosion is a chemical reaction process that occurs between a metal surface and electrolyte. Mostly, the radiator tubes and tanks are made of aluminum with a high heat transfer rate. The coolant flows under pressure through the aluminum tubes, which gives rise to erosion-corrosion. The present thesis sheds light on the corrosion mechanism of Al 3003 alloy radiator tubes in contact with 50/50 ethylene glycol water coolant. The main objective is to understand …
Cfd Modelling Of Wet Cooling Media And Design Optimization Of Heat Sink For Data Center Application,
2016
University of Texas at Arlington
Cfd Modelling Of Wet Cooling Media And Design Optimization Of Heat Sink For Data Center Application, Shivang Yogeshkumar Desai
Mechanical and Aerospace Engineering Theses - Archive
Air cooling is most widely used and economical method of currently available cooling technologies in which heat exchanger plays a vital role in facility designs. Evaporative cooling can be energy efficient than mechanical cooling because it uses water’s enthalpy of vaporization. Wet cooling pads can be used as the direct evaporative cooling system in which pad is made of cellulose fibers those gets wet when water injected. When hot and dry air passes through pad surfaces, water evaporates in the air which cools down air adiabatically increasing humidity. These type of cooling units can be installed in these type of …
Design And Parametric Analysis Of Flow Control Device For Dynamic Cold Plate To Optimize The Temperature Fluctuations Of The Multi-Chip Module,
2016
University of Texas at Arlington
Design And Parametric Analysis Of Flow Control Device For Dynamic Cold Plate To Optimize The Temperature Fluctuations Of The Multi-Chip Module, Avinash Veluturla
Mechanical and Aerospace Engineering Theses - Archive
Continuing trends of increasing microprocessor power densities and non-uniform temperature distribution pose a significant challenge to the data center cooling. The most usual approach to data center cooling is air cooling but there are certain limitations to that approach. Major limitation is heat transfer coefficient so in order to overcome those limitations, we came up with liquid cooling using water as coolant. To minimize energy consumption of cooling system the objective is to design a dynamic energy efficient and practical cooling solution for high power equipment. Multi-chip module is used as the base for the liquid cooling solution. The main …
Computational Analysis Of Impact Loading On Wafer Level Chip Scale Packages Mounted On Printed Circuit Boards Of Varying Thickness,
2016
University of Texas at Arlington
Computational Analysis Of Impact Loading On Wafer Level Chip Scale Packages Mounted On Printed Circuit Boards Of Varying Thickness, Anik Mahmood
Mechanical and Aerospace Engineering Theses - Archive
In the electronic industry one of the popular package is Chip Scale Package (CSP) due to its small form factor and low cost. To meet the need of new functionality and portability of the recent devices, CSPs’ have been most favorable choice for a long time. On the other hand, with the miniaturization process of these portable devices there is a growing risk of drop impact failure in day to day use. It’s not only the mechanical loading that is affecting the reliability of these devices but also thermal and thermo-mechanical loads are acting simultaneously. To analyze and ensure the …
