Browsing by Author "Bhavnani, Sushil"

Now showing items 1-18 of 18

Biomass Gasification for Power and Fuel Applications using a Bench-Scale Bubbling Fluidized Bed Gasifier

Kulkarni, Avanti (2015-05-18)

Today fossil fuels are a major source of energy. Coal is used extensively around the world for power applications, while petroleum products are used to fulfill liquid fuel needs. This extensive use of fossil fuels has led ...

Design and Numerical Simulation of an Evaporator for a Compact Vapor Compression Refrigeration System

Kendall, Benjamin (2019-09-12)

A miniature plate-fin heat exchanger was designed for use in a compact Vapor Compression Refrigeration (VCR) system used for cooling electronic components in an Air Transportable Rack (ATR) chassis. The evaporator was ...

Effects of Surface Structure and Wettability Modification on Condensate Mobility and Heat Transfer on Flat and Tubular Surfaces

Duron, Christopher (2017-07-25)

Dropwise condensation has long been known to offer heat transfer coefficients potentially an order of magnitude higher than filmwise condensation as mobile droplets can more readily be removed from condenser surfaces ...

Experimental Evaluation of Immersion-Cooled Strategies for High-Powered Server Modules

Sridhar, Aravind (2012-07-19)

Cooling of server-level high-performance computing equipment is an ongoing challenge. Early approaches, based almost entirely on forced air cooling, resulted in unsustainably high energy usage in the air-conditioning units. ...

Experimental Investigation of a Liquid Immersion Cooled Electronics Module using Two-Phase Heat Transfer for Thermal Management

Gess, Joshua (2015-09-25)

As society’s demand for constant connectivity to one another grows, both from an economic and social perspective, the requirements on high performance data centers throughout the world will as well. The expeditious transfer ...

Experimental Investigation of Flow Boiling Characteristics of an Immersion Cooled Server Model

Chandrasekaran, Sriram (2017-07-27)

The meteoric growth of global communication and networking infrastructure has resulted in demand for high-performance data centers. With the increase in power capacity of server electronics, thermal management of data ...

Experimental Investigation of Flow Boiling in Saw-Toothed Silicon Microchannels

Gao, Le (2018-07-20)

Modern-day microprocessors consist of over one billion integrated circuits on silicon chips as small as a human fingernail. Normal operation of this circuitry produces an enormous amount of heat on a very small footprint. ...

Experimental Methods for the Analysis of Frost Nucleation and Frost Growth on Hydrophilic and Hydrophobic Coated Flat Plate Surfaces in Forced Convection Channel Flows

Adanur, Burak (2019-12-09)

An experimental system was designed and built to explore the effect of coated surfaces on frost formation. The experimental system consists of a wind tunnel test apparatus, dew point sensors, thermocouples for temperature ...

Experimental Study of Renewable Energy Implementation in Cement Kilns through Industrial-Scale Downdraft Gasification of Poultry Litter

Hains, Bryant (2011-08-17)

Waste biomass, most notably poultry litter, is a potential source of energy that is widely available and cheap, especially in the southeast. Using poultry litter as an energy source provides a year-round outlet for this ...

Investigation of Al2O3 Nanoparticle Laden Lubricants and Refrigerant Mixtures During Two-Phase Flow Boiling

Bigi, Andrea A. M. (2018-04-27)

In space conditioning and in cooling systems for high power density electronics, vapor compression cycles provide cooling. The working fluid is a refrigerant and oil mixture. A small amount of oil is needed to lubricate ...

Liquid Jet Impingement on Mesoscale Modified Surfaces for Power Electronics Cooling

Smith, Aaron (2023-10-25) ETD File Embargoed

In each vehicular generation, active safety and comfort features are added and enhanced, increasing the power draw required to operate every feature. As a result, heat generation in the power electronics is increasing, ...

Next-Gen Thermal Management for Electronics in Space – Asymmetric Sawtooth and Cavity-Enhanced Nucleation-Driven Transport (ASCENT)

Sridhar, Karthekeyan (2023-08-29) ETD File Embargoed

Nucleate pool boiling in microgravity is characterized by stagnant vapor bubble dynamics, leading to early dryout of the heated surface compared to terrestrial conditions. The Asymmetric Sawtooth and Cavity-Enhanced ...

Numerical Simulation Using Transition SST Model to Analyze Effects of Expanding Manifold Angle and Jet Spacing for Submerged Liquid Jet Impingement

Reid, Kayla (2018-07-23)

Increasing numbers of under-hood sensors and power electronics modules are becoming standard in both commercial and military vehicles. In order to function reliably, these technologies require a dedicated and dynamic cooling ...

Spray Evaporation on Enhanced-Surface Tube Bundles with Low-GWP Refrigerants

Rothe, Joshua (2023-05-04) ETD File Embargoed

With the development of new low-GWP HFO refrigerants and increasingly stringent regulation of existing HVAC&R systems, the heat transfer performance of these refrigerants and the effects of various enhancement techniques ...

Staggered and In-line Submerged Jet Arrays for Power Electronics Using Variable Area Discharge Manifolds

Henry, Michael (2018-07-03)

Power electronics packages in electric and hybrid vehicles require dedicated and dynamic cooling to perform reliably. Generally, such packages are designed to spread heat to a large surface area, and employing the radiator ...

Terrestrial Investigation of Vapor Bubble Characteristics in Nucleate Pool Boiling of a Dielectric Fluid on an Asymmetric Microstructured Metal Heat Sink (Pre-cursor to Microgravity ISS Experiments)

Sridhar, Karthekeyan (2020-07-08)

This experimental, terrestrial study is part of a larger effort to dissipate increased heat fluxes through enhanced pool boiling in spacecraft electronics prior to an extensive study to be conducted on the International ...

Thermal Modeling and Simulation of Metals Additive Manufacturing

Paudel, Basil (2019-12-05)

Additive manufacturing (AM) enables a layer-wise approach to near-net shape fabrication of three-dimensional computer aided designs. In powder-metal-based AM processes, such as directed energy deposition (DED) and laser-powder ...

Thermodynamic Model and Initial Experimental Investigation of Air Dehumidification through Electrically Charged Vapor Capturing Electrostatic Droplets

Morcelli, Stefano (2022-04-18) ETD File Embargoed

The removal of water vapor from the air to reduce relative humidity is a well known indoor environmental comfort requirement. Common dehumidification approaches require a substantial amount of energy and usually involve ...