Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Enhanced heat transfer"”.
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Oscillatory Flow Mechanism for Enhanced Heat Transfer
… use of an oscillatory flow mechanism to enhance heat transfer. The idea behind this is to induce oscillation of the end wall of one of two connected chambers of a heat exchanger which effectively will induce oscillation of the boundary layer within the connecting duct. The main idea of this …
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Vortex-enhanced heat transfer by a new delta-winglet array
Liquid-to-air and phase-change heat exchanger performance is crucial to meet efficiency standards with low cost and environmental impact in numerous end-use energy applications. Research on performance improvement of heat exchangers often focuses on the air side because transport coefficients are …
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Development of enhanced heat transfer components and heat pump systems for decarbonization
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Wetting and phase-change phenomena on micro/nanostructures for enhanced heat transfer
… extreme wetting properties can influence the heat transfer performance during phase-change which is of great importance in a wide range of applications including thermal management, building environment, water harvesting and power production. In particular, superhydrophilic surfaces have been …
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EHD Enhanced Heat Transfer in a Metallic and a Ceramic, Compact Heat Exchanger
Electrohydrodynamic (EHD) heat transfer enhancement has enormous potential to increase heat transfer rates while minimizing heat exchanger size. The aircraft industry, for one, could benefit using EHD heat transfer enhancement. Engineers can change their design approach and plan for minimal loads, …
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Enhanced Heat Transfer Performance by Shape Optimization of a Non-axisymmetric Droplet Evaporating on a Heated Micropillar
<p>Abstract</p> <p>Enhanced Heat Transfer Performance by Shape Optimization of a Non-axisymmetric Droplet Evaporating on a Heated Micropillar</p> <p>By</p> <p>Haotian Wu</p> <p>Department of Mechanical Engineering and Materials Science</p> <p>Washington University in St. Louis, 2019</p> <p>Research …
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Experimental investigation of leading edge jet impingement with varying jet geometries and inlet supply conditions for turbine cooling applications.
… gas turbine airfoils to combat the extreme heat loads incurred within this region. This experimental investigation employs a transient liquid crystal technique to obtain detailed Nusselt number distributions on a concave, cylindrical surface that models the leading edge of a turbine blade. …
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The Enhancement of Convective Heat Transfer in an Aluminum Oxide Nanoaerosol
… nanoparticles in air on the rate of convective heat transfer. The particle mass loading was varied over a range of flow Reynolds number. The results indicate up to a 36% increase in Nusselt number for a particle mass loading of 0.35% at a Reynolds number of 6,000. The enhanced heat transfer rate …
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Scalable manufacturing of hierarchical nanostructures for thermal management
… to make new kinds of hierarchical coatings with enhanced heat-transfer performance in spray-cooling applications, which include nuclear reactor boiling, continuous casting of metals, and thermal management of electronics.
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Neutron scattering and microscopy studies of the structure and dynamics of water near a nanostructured hydrophilic copper oxide surface
… significantly improve the thermal performance of heat transfer devices known as oscillating heat pipes (OHPs). The origin of this enhanced performance is currently unknown, but it is believed to be attributed to the thin film of interfacial water supported by the nanostructures that coat the OHP's …
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Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications
… and pentanol solution to study the boiling heat transfer enhancement at pressures of 1 ~ 4 bars. Although self-rewetting fluids have been used to enhance the performance of heat pipes, boiling heat transfer characteristics are yet to be fully understood especially at pressures above …
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Performance Evaluation of the Three Dimensional Woven Copper Matrix as Heat Exchanger
… dimensional copper woven matrix is used as a heat exchanger device. The structure of copper mesh is made up of the fill, cross plane and warp yarn. Various geometrical configurations of the mesh are obtained by removing the alternate yarns and by varying the diameter ratio. These variations …
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Characterization of Heat Transfer Enhancement for an Oscillating Flat Plate-Fin
Heat transfer augmentation is of paramount importance in energy transfer and storage systems and the idea of using the inherent vibrations in a system to enhance heat transfer needs to be thoroughly researched upon. The current study numerically investigates an infinitesimally thin plate-fin …
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Experimental Investigation of the Effect of Copper Nanowires On Heat Transfer and Pressure Drop For A Single Phase Microchannel Heat Sink
<p>This thesis experimentally investigates the heat transfer and pressure drop characteristics of a shallow rectangular single phase microchannel heat sink with hydraulic diameter of 0.672 mm and whose bottom wall is coated with Cu nanowires (CuNWs) of 200 nm in diameter and 0.050 mm in length. …
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Lattice Vibration Study Of Silica Nanoparticle In Suspension
… such as water, ethylene glycol. Nanofluids show enhanced heat transfer characteristics compared to the base fluid. The thermal transport properties of nanofluids depend on various parameters e.g. interfacial resistance, Brownian motion of particles, liquid layering at the solid-liquid interface …
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Flat-Plate Solar Collectors for Water Heating with Improved Heat Transfer for Application in Climatic Conditions of the Mediterranean Region
… solar collectors using a novel cost effective enhanced heat transfer technique. The project work focuses on the process of energy conversion from the collector to the working fluid. This is accomplished by employing an aluminium grid placed in the channels of a collector to induce a gradient of …
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Effects of Hot Isostatic Pressing on Copper Parts Additively Manufactured via Binder Jetting
… material properties, which finds use in enhanced heat transfer and electronics applications. Its high thermal conductivity and reflectivity cause challenges in the use of Powder Bed Fusion AM systems that involve supplying high-energy lasers or electron beams. This makes Binder Jetting a …
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Modeling and Control of the Open Plate Reactor
… control of the Open Plate Reactor (OPR), a new heat exchange reactor being developed by Alfa Laval AB. It combines intensified mixing with enhanced heat transfer capacity into one operation. With the novel concept, highly exothermic reactions can be produced using more concentrated reactants, …
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Heat transfer between a supernatant gas and a flowing vibrofluidized bed of solids
A novel concept of recovering heat from hot gases using countercurrently flowing vibrofluldized solids (that is, solids levitated solely by mechanical vibration) has been proposed and tested. Based on a theoretical heat transfer model, the heat transfer coefficient between the air and the solids …
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Stability of Depletion Chamber Edges in Oil Sands Recovery Processes
… an insulative effect in a reservoir to reduce heat loss and consequently raising the thermal efficiency. Solvents most used in oil sands processes are C3 to C7 solvents whereas NCGs typically consist of natural gas (methane) or carbon dioxide. Despite a lot of research on solvent and …
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