Thermal Design Of Lithium Bromide-Water Solution Vapour Absorption Cooling System For Indirect Evaporative Cooling For It Pod,
2014
University of Texas at Arlington
Thermal Design Of Lithium Bromide-Water Solution Vapour Absorption Cooling System For Indirect Evaporative Cooling For It Pod, Digvijay Ramkrishna Sawant
Mechanical and Aerospace Engineering Theses - Archive
Supervising Professor: Dereje Agonafer Nowadays with increase use of internet, mobile there is increase in heat which ultimately increases the efficient cooling system of server room or IT POD. Use of traditional ways of cooling system has ultimately increased CO? emission and depletion of CFC's are serious environmental issues which led scientific people to improve cooling techniques and eliminate use of CFC's. To reduce dependency on fossil fuels and 4environmental friendly system needed to be design. For being utilizing low grade energy source such as solar collector and reducing dependency on fossil fuel vapour absorption cooling system has shown a …
Finite Element Based Methodology For Prediction Of Matrix-Dominated Failure In Composites,
2014
University of Texas at Arlington
Finite Element Based Methodology For Prediction Of Matrix-Dominated Failure In Composites, Guillaume Seon
Mechanical and Aerospace Engineering Dissertations - Archive
The objective of this work is to develop a computational failure prognosis methodology applicable to virtual testing of composites. The major motivation for the establishment of virtual testing is the ability to reduce actual testing of composite structures, which is oftentimes expensive and time consuming, by numerical simulations. A successful virtual test methodology should be applicable to monotonic and fatigue loading, account for strong anisotropy of composite materials and capture the effects of manufacturing irregularities. This work proposes to use three-dimensional finite element modelling for predicting the onset and progression of matrix-dominated failures modes, such as matrix cracks and delaminations, …
Improving Ducting To Increase Cooling Performance Of High-End Web Servers Subjected To Signicant Thermal Shadowing -An Experimental And Computational Study,
2014
University of Texas at Arlington
Improving Ducting To Increase Cooling Performance Of High-End Web Servers Subjected To Signicant Thermal Shadowing -An Experimental And Computational Study, Divya Mani
Mechanical and Aerospace Engineering Theses - Archive
Ensuring that all the critical components like CPU's receive sufficient amount of flow as per their requirement is an vital importance in implementing air cooling for IT equipments. In addition to that the overall system resistance varies with the component location with in the chassis. In this study, parametric improvement in chassis ducting system is made to counteract the effects of thermal shadowing in a open compute air cooled server in which a CPU thermally shadows the other. Commercially available computational fluid dynamics codes have permitted simulation of server models to predict efficiency of the servers with every changes made …
Analytical And Experimental Investigation Of Thermal Transport In Three-Dimensional Integrated Circuits (3d Ics),
2014
University of Texas at Arlington
Analytical And Experimental Investigation Of Thermal Transport In Three-Dimensional Integrated Circuits (3d Ics), Leila Choobineh
Mechanical and Aerospace Engineering Dissertations - Archive
Thermal management of three-dimensional integrated circuits (3D ICs) is recognized to be one of the foremost technological and research challenges currently blocking the widespread adoption of this promising technology. The computation of steady-state temperature fields in a 3D IC is critical for determining the thermal characteristics of a 3D IC and for evaluating any candidate thermal management technology. An analytical solution for the three-dimensional temperature field in a 3D IC based on solution of the governing energy equations using Fourier series expansion for steady-state temperature fields is studied. Comparison of the predicted temperature fields with finite-element simulation shows excellent agreement. …
Effect Of Warm Water Cooling For An Isolated Hybrid Liquid Cooled Server,
2014
University of Texas at Arlington
Effect Of Warm Water Cooling For An Isolated Hybrid Liquid Cooled Server, Alekhya Addagatla
Mechanical and Aerospace Engineering Theses - Archive
Data center cooling strategies have changed overtime due to increases in power densities and ever increasing server cooling power requirement. Traditionally, most data centers adopt air cooling where the Computer Room Air Conditioning (CRAC) units pump volumes of chilled air to cool information technology (IT) equipment and dispose the heat from the servers to the ambient. With demand for energy-efficient and cost-effective data centers growing, alternative methods to both provide electrical power and cooling systems are the subject of active investigation. As data centers increase in size and current air-cooling systems reach their limitations, cooling technology will inevitably evolve towards …
A New Multiscale Approach For Dynamic Modeling And Simulation Of Micro-Nano Biomolecular Systems Characterized By A Low Reynolds Number,
2014
University of Texas at Arlington
A New Multiscale Approach For Dynamic Modeling And Simulation Of Micro-Nano Biomolecular Systems Characterized By A Low Reynolds Number, Mahdi Haghshenas-Jaryani
Mechanical and Aerospace Engineering Dissertations - Archive
In this dissertation, a new multiscale computational framework was developed in order to model and simulate motility of micro-nano-sized objects in fluid environments, characterized with a low Reynolds number. Especially, it has been used for studying the dynamic behavior of biomolecular systems such as motor proteins inside cells.Long simulation run time is one of the most important issues in modeling of cellular and biomolecular systems at the nanoscale due to the multiple time and length scales involved in the dynamics of these systems. These multiscale features are caused by either structure-structure (e.g. flexibility in biological structure or contact) or structure-fluid …
Factors Affecting The Performance Characteristics Of Wet Cooling Pads For Data Center Applications,
2014
University of Texas at Arlington
Factors Affecting The Performance Characteristics Of Wet Cooling Pads For Data Center Applications, Vishnu Sreeram
Mechanical and Aerospace Engineering Theses - Archive
The energy consumption of data centers in the current US market is fast growing in large numbers by every day. It was reported that in 2013, US data centers almost consumed 91 billion kilowatt-hours of electricity significant enough to power the whole of New York city twice a year [1]. Ever since the explosion of cloud computing, digital content and others the energy consumed by data centers has taken a steep increase and will continue in the coming years.As a result, there is a growing need to reduce the energy consumption of data centers by employing different cooling techniques which …
Experimental And Computational Study Of An It Pod And Its Cooling System,
2014
University of Texas at Arlington
Experimental And Computational Study Of An It Pod And Its Cooling System, Suhas Sathyanarayan
Mechanical and Aerospace Engineering Theses - Archive
Conventional data centers are extremely large buildings that have complex power distribution and cooling systems. These data centers employ relatively expensive cooling systems which are inefficient. These inefficiencies of traditional data centers can be overcome by partitioning the server load into modular sections which can be deployed, powered and cooled depending on availability and requirement. Modular data centers are increasingly being developed instead of using large data centers to save huge amount of capital investment. High energy efficiency is a priority and measures have been taken to increase it. Cooling techniques such as air-side economization and evaporative cooling are proving …
Elimination Of Surface Tension Effect On A Small Plate By Developing Superwetting Surfaces,
2014
University of Texas at Arlington
Elimination Of Surface Tension Effect On A Small Plate By Developing Superwetting Surfaces, Varun Garg
Mechanical and Aerospace Engineering Theses - Archive
In this work, we explored the possibility of creating superwetting surfaces, which are defined here as the ones with apparent contact angles less than 5°, using roughness structures for the purpose of eliminating surface tension effect on a floating small plate. It is often considered that the ratio of the actual roughness surface over the projected one plays a critical role in generating superwetting surfaces. However, we found that the ratio of the top surfaces of roughness structures over the projected one had more influence on apparent contact angles. As this ratio was less than 0.013, the resulting apparent contact …
Design And Multifidelity Analysis Of Dual Mode Scramjet Compression System Using Coupled Npss And Fluent Simulation,
2014
University of Texas at Arlington
Design And Multifidelity Analysis Of Dual Mode Scramjet Compression System Using Coupled Npss And Fluent Simulation, Nandakumar Vijayakumar
Mechanical and Aerospace Engineering Theses - Archive
Hypersonic airbreathing engines provide many potential opportunities for future aerospace applications and immense efforts have been taken in gaining knowledge in them for the past decades .The physical phenomenon occurring in the hypersonic flow regime makes the design and performance prediction of a scramjet engine difficult. Though the cutting edge simulation tool development fights its way towards accurate prediction of the environment, the time consumed by the entire process in designing and analyzing a scramjet engine and its component, can be excessive. A multi-fidelity approach for designing a scramjet with a cruising Mach number of 6 is detailed in this …
Computational Study Of Behavior Of Gas Absorption In Data Center Equipment And Its Effects On The Rate Of Corrosion/Contamination,
2014
University of Texas at Arlington
Computational Study Of Behavior Of Gas Absorption In Data Center Equipment And Its Effects On The Rate Of Corrosion/Contamination, Tejeshkumar Vasantrao Bagul
Mechanical and Aerospace Engineering Theses - Archive
The reliability of the data center equipment is being compromised as the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendable psychrometric limits are stretched outside the recommendable zones. When the ambient conditions are conducive enough the humidity and the gaseous contaminants present in the data centers react with the elements of Printed Circuit Boards (PCB) at various temperatures. The products of the reaction may lead to short circuit or extra resistance to the passage of current. This poses an increased threat to the reliability of the PCB.Contamination has become a serious problem in the developing nations like …
Interaction Of Growing Cracks In Hydraulic Fracturing,
2014
University of Texas at Arlington
Interaction Of Growing Cracks In Hydraulic Fracturing, Li Wei Lo
Mechanical and Aerospace Engineering Theses - Archive
Recently, hydraulic fracturing has been utilized to extract natural gas and oil from low-permeability shale rocks. This technique has been studied in hundreds of papers. A deep understanding of the fracture network formation in hydraulic fracturing is essential to advancing the technology, e.g., to enhance the quality of fracking, and to keep aquifers from being contaminated. In the present study, the Linear Elastic Fracture Mechanics (LEFM) is applied to approach the crack extension behaviors in brittle rocks under hydraulic loading. The boundary element method is used to carry out the simulation where numerical treatment is only needed upon the cracks …
Influence Of Variation In Cpu Utilization On The Rack Level Fan Configuration As A Cooling Technique For High End Servers,
2014
University of Texas at Arlington
Influence Of Variation In Cpu Utilization On The Rack Level Fan Configuration As A Cooling Technique For High End Servers, Shreyas Nagaraj
Mechanical and Aerospace Engineering Theses - Archive
The data center industry has experienced significant growth over the past decade with the introduction and explosion of online banking, social networking and entertainment services. As a result, power consumption of such facilities continues to grow at a rapid pace. It has become imperative that energy savings and efficiencies be pursued in these components at various levels within the data center facility. This project aims to achieve the same by replacing internal server fans with larger, more-efficient fan units at the rear face of the rack. This study will be conducted by using a cluster of 1.5U Intel based Open …
Microwave-Based Navigation Of Femtosatellites Using On-Off Keying,
2014
University of Texas at Arlington
Microwave-Based Navigation Of Femtosatellites Using On-Off Keying, Namrata J. Kamte
Mechanical and Aerospace Engineering Theses - Archive
The objective of this research is to validate that a custom-built microchip-scale satellite transmitting a signal modulated with a Pseudo Random Noise code using On-Off Keying, can be tracked. The weak GPS satellite signal is modulated with a Pseudo Random Noise (PRN) code that provides a mathematical gain. Our signal is modulated with the same PRN code using On-Off Keying (OOK) unlike Phase Shift Keying used in GPS satellites. Our goal is to obtain timing and positioning information from the microchip-scale satellite via a ground station using the concepts of PRN encoding and the OOK modulation technique.Decimeter scale satellites, with …
Use Of Nanoparticle Enhanced Phase Change Material (Nepcm) For Data Center Cooling Application,
2014
University of Texas at Arlington
Use Of Nanoparticle Enhanced Phase Change Material (Nepcm) For Data Center Cooling Application, Harshal Gujarathi
Mechanical and Aerospace Engineering Theses - Archive
This study attempts to take advantage of nanoparticles with high thermal conductivity and the latent heat capacity of phase change materials together to enhance heat transfer rate. The main difficulty in using PCM for energy application is its low thermal conductivity in solid state. So, when solidification starts it makes it hard for evacuation of energy. A paraffin-based nanoparticle containing various volume fractions of Cu was applied. The suspended nanoparticles caused an increase in thermal conductivity of nanoparticles enhanced phase change material (NEPCM) compared to conventional PCM, resulting in heat transfer enhancement and a higher melting rate. The higher temperature …
Improving Air Cooling Efficiency Of 2ou High-End Web Server By Using Bigger Rack Level Fans And Controlling Flow Using Bimetallic Strips,
2014
University of Texas at Arlington
Improving Air Cooling Efficiency Of 2ou High-End Web Server By Using Bigger Rack Level Fans And Controlling Flow Using Bimetallic Strips, Ravi Teja Mutyala
Mechanical and Aerospace Engineering Theses - Archive
Due to the doubling of processing power ever so often, designing an efficient thermal management system for database centers is becoming more and more difficult. Two studies have been done, one on air cooling using bigger rack level fans and another in liquid cooling minimizing the size of flow control devices. Fans are one of the most inefficient and power hungry devices used in an air cooled database center. Study has been done to improve the air cooling efficiency using larger rack level fans on 2OU open compute server. Simulations have been done using commercial computational fluid dynamic (CFD) software …
Composite Materials Equivalent Properties In Lamina, Laminate, And Structure Levels,
2014
University of Texas at Arlington
Composite Materials Equivalent Properties In Lamina, Laminate, And Structure Levels, Kamran Tavakoldavani
Mechanical and Aerospace Engineering Theses - Archive
Increasing use of thick composite structures requires a large model for structural analysis. In the analysis, equivalent properties of composites are often used. The equivalent properties of a composite are defined as the properties of a homogeneous orthotropic composite to representative an anisotropic heterogeneous composite material.A set of equations for equivalent mechanical and thermal properties in lamina and laminate as well as structures was developed. The developed model for lamina and laminate of composite was based upon the equivalent structural characteristics of 0? lamina and homogenized 0? laminate for lamina and laminate level, respectively. The concept of narrow beam was …
Evaluating Heat Sink Performance In An Immersion-Cooled Server System,
2014
University of Texas at Arlington
Evaluating Heat Sink Performance In An Immersion-Cooled Server System, Trevor Dean Mcwilliams
Mechanical and Aerospace Engineering Theses - Archive
As operating power within server systems continues to increase in support of increased data usage across networks worldwide, it is necessary to explore options outside of traditional air-cooled systems. In this study, a specific server will be immersed and cooled using circulated mineral oil. The challenges associated with an emerging cooling technology are numerous. Trying to adapt existing air-cooled systems into oil-cooled systems has its difficulties. The viscous properties of oil make it resistive to traveling through the narrow fins of a conventional heat sink, and thermal mixing is not easy to achieve as it is in air due to …
Optimal Design Variable Considerations In The Use Of Phase Change Materials In Indirect Evaporative Cooling,
2014
University of Texas at Arlington
Optimal Design Variable Considerations In The Use Of Phase Change Materials In Indirect Evaporative Cooling, Ankit Paul Chilakapaty
Mechanical and Aerospace Engineering Theses - Archive
The demand for sustainable, energy efficient and cost effective heating and cooling solutions is exponentially increasing with the rapid advancement of computation and information technology. Use of latent heat storage materials also known as phase change materials (PCMs) for load leveling is an innovative solution to the data center cooling demands. These materials are commercially available in the form of microcapsules dispersed in water, referred to as the microencapsulated phase change slurries and have higher heat capacity than water. The composition and physical properties of phase change slurries play significant role in energy efficiency of the cooling systems designed implementing …
Modeling And Simulation Of Nanofluid For Heat Storage,
2014
University of Texas at Arlington
Modeling And Simulation Of Nanofluid For Heat Storage, Yatish Nagaraj
Mechanical and Aerospace Engineering Theses - Archive
This work models the dynamic behavior of molten nitrate salt mixture to investigate the formation of interfacial nanostructures in ionic liquid nano-fluids which is responsible for increase of heat capacity of the mixture. A key application of these fluids is in heat storage in solar collector where the heat capacity determines the amount of energy storage and therefore the efficiency of a solar collector system. The heat capacity can be significantly increased by the addition of a small amount of nanoparticles, of radius 1 to 100 nanometers in a concentration of approximately 1 by weight. This increase appears to be …
