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Articles 481 - 510 of 962
Full-Text Articles in Mechanical Engineering
Experimental Characterization Of Hybrid Cooled Cisco Servers Including The Effect Of Warm Water Cooling, Md Malekkul Islam
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, Dhaval Hitendra H Thakkar
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, Harinkumar Rajendrabhai Patel
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, Soham M. Umbrajkar
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, Saurabh Deobhankar
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, Shivang Yogeshkumar Desai
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, Avinash Veluturla
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, 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 …
Evaluation Of Cooling Architectures And Control Strategies In Airflow Provisioning A Modular Data Center, Jaykishankumar Kunjbihari Patel
Evaluation Of Cooling Architectures And Control Strategies In Airflow Provisioning A Modular Data Center, Jaykishankumar Kunjbihari Patel
Mechanical and Aerospace Engineering Theses - Archive
To achieve energy efficiency and reduce operational costs in data centers with modularized Information Technology and cooling infrastructure there is an ongoing trend to minimize the use of mechanical cooling and instead use outdoor air in favorable environmental conditions for cooling purposes. The cooling module can comprise of evaporative cooling systems which use direct, indirect or a combination of direct/indirect evaporative cooling units to provide adequate cooling. The degree of cooling achieved in the IT module depends on the effective airflow provisioned and the air distribution methods employed. In this study, a modular data center which is equipped with a …
Cfd Based Design And Optimization Of Louver Blade Angles To Enhance Better Air Flow Distribution And Improve Thermal Efficiency Of It Equipment In Data Centers, Avinash Kumar Ray
Cfd Based Design And Optimization Of Louver Blade Angles To Enhance Better Air Flow Distribution And Improve Thermal Efficiency Of It Equipment In Data Centers, Avinash Kumar Ray
Mechanical and Aerospace Engineering Theses - Archive
A data center is a depository which stores, processes and distribute large amounts of data and information using computer systems and associated components for power supplies, cooling systems. Modular data center is a portable method of deploying traditional large data center capacity into a small portable unit. According to the Uptime Institute, the amount of heat generated inside IT equipment has been increasing significantly. Data centers are using nearly 60% of their power in employing expensive cooling techniques. In addition, the cost of cooling has necessitated a need to reduce or eliminate mechanical cooling. As such, Air Economization, Direct and …
Development Of Paraffin Wax As A Phase Change Material For Thermal Management In Electronic Systems, Aditya Pinto
Development Of Paraffin Wax As A Phase Change Material For Thermal Management In Electronic Systems, Aditya Pinto
Mechanical and Aerospace Engineering Theses - Archive
Increasing development in electronic technologies has improved functionality and reduced physical constraints, while managing to impart higher power and performance in smaller and compact devices. As a result of this size reduction, there is also a reduction in the surface area required for heat dissipation. Due to this the thermal management problem has been further intensified. The end result is that the power density continues to rise even with improved thermal management strategies incorporated into the system. Thermal management hence plays an important aspect especially when the design of compact electronic devices is concerned. For most electronic applications thermal loads …
Design Consideration And Steady State Study Of Thrust Bearings In High Speed Subsonic Applications, Arvind Prabhakar
Design Consideration And Steady State Study Of Thrust Bearings In High Speed Subsonic Applications, Arvind Prabhakar
Mechanical and Aerospace Engineering Theses - Archive
Thrust bearings are required to perform at high speeds in various turbomachinery applications causing the nature of fluid flow within the bearings to be in high subsonic as well as supersonic regimes. The motivation of this research is to develop a bearing performance prediction model tailored for high subsonic speeds and large Reynolds numbers. The prime fluid characteristics studied in the thin film for predicting the bearing performance has been achieved by carefully considering inertial, viscous as well as compressible effects within the thin film fluid flow. Fluid inertia is a vital physical phenomenon that plays an important role in …
Computational Study And Error Analysis Of An Integrated Sampling-Probe And Gas-Analyzer For Mixing Measurements In Supersonic Flows, Wenbo Zhu
Mechanical and Aerospace Engineering Theses - Archive
Concentration probes are employed in supersonic flow mixing experiments for binary gas mixture composition measurements. These measurements are fundamental for the advancement of the scramjet technology. While non-intrusive laser-based methods (such as planar laser-induced fluorescence and filtered Rayleigh scattering) have been developed greatly over the past few decades, intrusive methods (such as concentration probes) still play an essential role in the measurement of mixture composition due to the fact that, with correct application, they do not require further assumptions on the aerothermodynamic states of the investigated mixture, which are often difficult to corroborate. Conversely, such assumptions are essential to the …
Investigation Of Additive Manufacturing Using Industrial Robots, Matt Heuser
Investigation Of Additive Manufacturing Using Industrial Robots, Matt Heuser
Mechanical and Aerospace Engineering Theses - Archive
Conventional additive manufacturing platforms are controlled using G-code, a numerical control language used to define the process parameters and move- ment of the print head. First, a digital model of the desired shape is created using 3-D computer graphics software. Then the model is analyzed by software tools that generate the necessary G-code instructions to be used by a 3-D printer to produce the desired object. The goal of this research is to lay the foundation and develop the necessary tools to 3-D print custom objects based on the viscous extrusion process using industrial robots. The first task is to …
Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor, Pranav Milind Phadtare
Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor, Pranav Milind Phadtare
Mechanical and Aerospace Engineering Theses - Archive
Energy crisis is one of the most pressing problems that the world is facing. It involves a number of issues to be addressed in energy sources, transportation, storage, etc. Novel ways of energy storage are being actively explored. Electrical energy is stored by using devices such as batteries, capacitors, supercapacitors, etc. Supercapacitor seems to be a promising technology for this purpose. Traditionally, batteries have high energy densities but low power delivering density. On the other hand, conventional capacitors are capable of delivering high power densities but possess low energy storage density. Supercapacitors are a bridge between the two devices. Of …
A Comparative Study Of The Thermo-Mechanical Behavior Of Wcsp Assembly Due To Difference In Pcbs’ Layer Thickness, Trina Barua
A Comparative Study Of The Thermo-Mechanical Behavior Of Wcsp Assembly Due To Difference In Pcbs’ Layer Thickness, Trina Barua
Mechanical and Aerospace Engineering Theses - Archive
The reliability of Chip Scale Package assembly is of great concern for the electronic industry. Due to multiple function integration of the present devices there is a high demand of ultra-miniaturization of the integrated parts to build the inside circuit assembly. Wafer Level Chip Scale Packages (WLCSP) are used in the industry to meet the challenges of these miniaturization due to its form factor, not so high cost and packaging efficiency which is also very high despite the known and unknown reliability issues. WLSCPs use packaging technology at the wafer level which is an extension of the wafer fab process …
Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images, Aditya Ramani
Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images, Aditya Ramani
Mechanical and Aerospace Engineering Theses - Archive
Introduction of UAV (Unmanned Aerial Vehicles) into the NAS (National Air Space) requires the detect-and-avoid capability. That is, an aircraft should be able to detect other aircraft flying in the same airspace volume and make evasive maneuvers if there is potential conflict. One potential methods currently investigated for detection of an intruder aircraft is to process digital images taken by onboard cameras. When and if intruder aircraft detection is successful through image processing, avoidance algorithms can greatly benefit from the relative position information. This thesis research investigates methods to compute the position of an intruder aircraft relative to an observer …
Numerical Study On Morphology And Solidification Characteristics Of Successive Droplet Depositions On A Substrate, Vimalan Adaikalanathan
Numerical Study On Morphology And Solidification Characteristics Of Successive Droplet Depositions On A Substrate, Vimalan Adaikalanathan
Mechanical and Aerospace Engineering Theses - Archive
Successive droplet impingement finds extensive applications in additive manufacturing technologies such as 3D printing, Liquid Metal Jetting and Net Form Manufacturing. Deposition, deformation and solidification of droplets are the constitutive stages in the process which determine the final outcome. Detailed knowledge about the flow behaviour, phase transformation and free surface deformation is required to have a complete understanding and optimization of the process parameters. Experimental research in this field is only limited to imaging techniques and post solidification analysis which only provide superficial information while overlooking most of the governing phenomenon. Knowledge of the physics governing the fluid and thermal …
Cfd Analysis Of Vapor Chamber With Micro Pillars As Heat Spreader For High Power Electronic Devices, Yasir Aziz Modak
Cfd Analysis Of Vapor Chamber With Micro Pillars As Heat Spreader For High Power Electronic Devices, Yasir Aziz Modak
Mechanical and Aerospace Engineering Theses - Archive
The recent trend in electronic industry shows that there is large power dissipation from the electronic devices and at the same time their sizes are getting smaller. This large power dissipation takes place in the form of releasing heat energy. It is observed that heat dissipation from the electronic devices is high and source size is small. The high device temperatures result in decreased reliability and increased failure rates. This difficulty can be addressed by controlling the temperatures at the source of heat generation. In chip scale package chip is the major source of heat generation. Thus our priority is …
Experimental And Computational Board Level Reliability Assessment Of Thick Board Qfn Assemblies Under Power Cycling, Sumanth Krishnamurthy
Experimental And Computational Board Level Reliability Assessment Of Thick Board Qfn Assemblies Under Power Cycling, Sumanth Krishnamurthy
Mechanical and Aerospace Engineering Theses - Archive
Quad Flat No-Lead Package (QFN) is one of the latest cutting edge technologies that took the industry by storm due to its excellent electrical and thermal performance, compact size and low cost. Due to its compact size, QFN package is an ideal choice for handheld portable applications and where package performance is required. In QFN packages, the electrical contact to the Printed Circuit Board (PCB) is made through soldering of the lands underneath the package body rather than the traditional leads formed along the perimeter. However, using thick PCBs can be detrimental to the reliability of the package. The motivation …
Effect Of Structural Variations On Thermal Deformation Of Single Curvature Composite Sandwich Panels, Brady C. Lotz
Effect Of Structural Variations On Thermal Deformation Of Single Curvature Composite Sandwich Panels, Brady C. Lotz
Mechanical and Aerospace Engineering Theses - Archive
Composite structures cured at a high temperature in a contoured female mold have a tendency to deform or spring-in when brought down to room temperature from cure temperature. This thesis investigates the effects of various structural parameters on the spring-in of the curved shape of a composite sandwich panel due to thermal deformation. A finite element model of a single curved composite sandwich panel is developed using 3D shell elements and validated against other published articles and classical lamination theory. Using a control structure of AS4/3501-6 carbon/epoxy with half inch Nomex honeycomb core with a layup of [0°/90°/0°/90°/Core/90°/0°/90°/0°]T, structural parameters …
Performance Evaluation Of Plate-Fin And Pin-Fin Heat Sinks For The Application Of Oil Immersion Cooling And Design Optimization Of Dynamic Cold Plate For The Application Of Warm Water Cooling, Parth Jayeshkumar Soni
Performance Evaluation Of Plate-Fin And Pin-Fin Heat Sinks For The Application Of Oil Immersion Cooling And Design Optimization Of Dynamic Cold Plate For The Application Of Warm Water Cooling, Parth Jayeshkumar Soni
Mechanical and Aerospace Engineering Theses - Archive
In IT industries, to keep server rooms and data centers cool is a constant challenge for hardware developers and the cooling solution providers. Air cooling is the most widely used approach for thermal management of servers in data centers from many years. However, the scenario is changing gradually as the computational ability of data center is increasing exponentially. Because of increasing computational ability, the heat generated by the servers is increased in such amount that air cooling is not as efficient as it was before. Hence, alternative cooling system is required. In 1970’s the idea of liquid cooling was introduced. …
Control Strategies For Air-Side Economization, Direct And Indirect Evaporative Cooling And Artificial Neural Networks Applications For Energy Efficient Data Centers, Abhishek Guhe
Mechanical and Aerospace Engineering Theses - Archive
The skyrocketing growth in data centers, facilities that house information technology (IT) equipment for storage, management and distribution of data while striving for 24/7/365 operation with 100% up-time, has accounted for 1.3% of global energy use. A significant portion of data center energy is dedicated to removing the heat generated by IT equipment to maintain safe operating conditions and optimum computing performance. Energy efficient cooling of data center is of vital importance. One of the options for significantly cutting the cooling cost is the use of air side economization (ASE), Indirect evaporative cooling (IEC) and Direct evaporative cooling (DEC) without …
Optimization Of Air Cooled Portion In A Server With Water Cooled Micro-Processors, Neha Inamdar
Optimization Of Air Cooled Portion In A Server With Water Cooled Micro-Processors, Neha Inamdar
Mechanical and Aerospace Engineering Theses - Archive
A Data center is the heart of our associated world. It is a facility that houses computer systems and related components. According to IDC, because of enormous increment in pattern of IoT (Internet of Things) and distributed computing the introduced limit of server farm workloads will increment by around 750% around 2014 and 2019. Data center spaces can consume up to 100 to 200 times as much power as standard office spaces. With such huge influence utilization, they are prime focuses for vitality proficient outline measures that can spare cash and lessen power use. In a regular Data center with …
A Study Of Electrical Double Layer Structure Over A Corroding Steel Surface In Sea Water, Pratik Babanrao Kale
A Study Of Electrical Double Layer Structure Over A Corroding Steel Surface In Sea Water, Pratik Babanrao Kale
Mechanical and Aerospace Engineering Theses - Archive
Corrosion is a natural deterioration phenomenon that throws profound adverse effects on the performance of structural steel in marine applications. Seawater consists of various corrosive components such as chlorine ions, sulphate ions and many more. These chemical components are mainly responsible for the corrosion phenomenon. Even though their bulk concentrations are known, their local concentrations and distribution in the vicinity of a steel surface where the corrosion occurs are yet unclear. Without the knowledge, would any approach to deal with the corrosion be empirical, at best. The main objective of the present thesis is to investigate the interfacial structure of …
Analysis Of An Artificial Tailplane Icing Flight Test Of A High-Wing, Twin-Engine Aircraft, Shehzad Maksudahmad Shaikh
Analysis Of An Artificial Tailplane Icing Flight Test Of A High-Wing, Twin-Engine Aircraft, Shehzad Maksudahmad Shaikh
Mechanical and Aerospace Engineering Theses - Archive
The US Air Force Flight Test Center (AFFTC) conducted a civilian, Federal Aviation Administration (FAA) sponsored, evaluation of tailplane icing of a twin-turboprop business transport at Edwards Air Force Base. The flight test was conducted to evaluate ice shape growth and extent of ice on the tailplane for specific weather conditions of Liquid Water Content (LWC), droplet size, and ambient temperature. This work analyzes the flight test data comparing the drag for various tailplane icing conditions with respect to a flight test verified calibrated aircraft model. Although less than a third of the test aircraft was involved in the icing …
A Mesh Based Boom To Stop Oil Spread, Bharathram Visweswaran
A Mesh Based Boom To Stop Oil Spread, Bharathram Visweswaran
Mechanical and Aerospace Engineering Theses - Archive
In this work, we develop a new boom to separate oil and water. In a commonly used boom, a membrane that has no pores is normally used to block oil spread. Since this membrane also blocks water flow, high pressure is easy to build on such a membrane to break or damage it. To solve this problem, in the new boom, the membrane is replaced with a hydrogel-coated mesh. The hydrogel-coated mesh has dual properties of superhydrophilicity and superoleophobicity. Accordingly, water can still go through the mesh, while oil cannot. Subsequently, liquid pressure on the mesh is reduced. In this …
Analysis Of Electric Double Layer Structure Formed During Corrosion Of Steel Pipes Carrying Potable Water, Tanmay Sanjeev Gupte
Analysis Of Electric Double Layer Structure Formed During Corrosion Of Steel Pipes Carrying Potable Water, Tanmay Sanjeev Gupte
Mechanical and Aerospace Engineering Theses - Archive
Corrosion of steel pipes carrying drinking water is a universal issue. It affects human health as the corrosion sediments in these pipes can be toxic and unfit for consumption. Further, the amassing of the corrosion products can lead to operational difficulties. Drinking water consists of anions like carbonate, hydroxides and chloride ions which are responsible for the corrosion process. In such types of aqueous corrosion, there is an interfacial region formed between the corroding metal and the bulk of the aqueous environment. This interfacial region is called the Electrical Double Layer. In this article, we direct to study the effects …
Reliability Challenges In Airside Economization And Oil Immersion Cooling, Jimil Manojbhai Shah
Reliability Challenges In Airside Economization And Oil Immersion Cooling, Jimil Manojbhai Shah
Mechanical and Aerospace Engineering Theses - Archive
The Datacom facility which comprises rooms or closets used for communication, computers/servers or electronic equipment requires cooling unit which consumes 31% (23% HVAC cooling + 8% HVAC fans) of overall energy. The ASHRAE TC9.9 subcommittee, on Mission Critical Facilities, Data Centers, Technology Spaces, and Electronic Equipment, has suited the data center’s executives by permitting brief period outings of the environmental conditions outside the prescribed temperature-humidity range, into passable extents A1-A4. To comprehend the expanding server densities and the required cooling vitality costs, data center operators are falling back on cost cutting measures. For instance, they are not firmly controlling the …
Harvesting Of Water From Fog Using Sponges, Jae Jun Lee
Harvesting Of Water From Fog Using Sponges, Jae Jun Lee
Mechanical and Aerospace Engineering Theses - Archive
Supervising Professor: Cheng Luo A sponge has porous structures. It is capable of both storing and transmitting water. In this work, we explored the possibility of applying three different types of sponges to collect fog. We also compared their fog-collection efficiencies with that of a typical Raschel mesh that is widely used in the field to collect fog. We found that, for three different fog speeds, the fog-collection efficiencies of three tested sponges were 39% to 93% those of the typical Raschel mesh, indicating that the sponges could serve as alternative fog collectors when well-developed collectors were not available. Sponge …