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Showing 1 to 9 of 9 for “"Leidenfrost temperature"”.
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The evaporation of drops from super-heated nano-engineered surfaces
In pool boiling and spray cooling the Leidenfrost point marks the transition from nucleate boiling, in which the evaporating liquid is in contact with the surface, and film boiling, in which a layer of vapor separates the fluid from the surface. For a single evaporating drop, the Leidenfrost point …
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Passive and active approaches to sustained turbulent hydrodynamic drag reduction using superhydrophobic surfaces
… approach, a submerged body is heated past its Leidenfrost temperature to form a thick, continuous film of steam between itself and the water. I continue to employ superhydrophobic surfaces, but now exploit their unique heat transfer properties (i.e. the insulation to heat transfer provided by …
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Three-Phase and Unidirectional Heat Transfer
… and nuclear reactor safety. Above a critical temperature referred to as the ``Leidenfrost temperature'', the highly effective nucleate boiling is completely replaced by insulating film boiling, causing a dramatic decrease in the essential cooling rate of water pool boiling and spray quenching. …
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Heat transfer during spray water cooling using steady experiments
… heat transfer rates and obtain desired surface temperature distributions, a deeper understanding of fundamental spray cooling dynamics and more accurate estimation of spray heat transfer rates is needed. In this thesis, a new technique combining experiment and computational modeling has been …
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Flow characteristics and phase interactions of evaporating sprays in gas-solid suspensions
… mixing, solids concentration, gas/solids temperature and gas/solids velocity acceleration. The complex interactions mechanism of phase change, three phase interaction, heat and mass transfer of gas, solids and evaporating droplets dominate the process efficiency and product quality. In …
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Tailoring hydrodynamics of non-wetting droplets with nano-engineered surfaces
… Another class of non-wetting droplet, the Leidenfrost drop, is studied with textured super-wetting surfaces. The liquid drop loses its contact to the solid by its own vapor, created by a large superheat from the solid. The Leidenfrost effect is undesirable in cooling applications as the …
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Droplet-based Two-phase Thermal Management
… transfer is reduced by 5.6% and 7.1% at surface temperatures of 50℃ and 65℃, respectively, as the entrapped bubble reduces the total liquid-solid interface area. After studying the droplet impact under non-boiling conditions, I continue to explore the droplet impact on a heated post in the …
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The Influence of Water Purity and Subcooling on the Minimum Film Boiling Temperature
Made available in DSpace on 2017-07-06T18:42:11Z (GMT). No. of bitstreams: 2 Adler_Mark_R_MS.pdf: 31275816 bytes, checksum: 99c2040effaee627b9d35beede8dc348 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1979
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CFD Modelling of Down-Sized GDI Engines: Fuel Injection, In-Cylinder Phenomena and Correlation to Engine-Out PN Emissions
… CA-resolved intake and exhaust pressure and temperature boundary conditions for the CFD simulations. In-cylinder surface temperatures were proven by this study to be an essential input to accurately predict the dynamics of liquid film formation and, in turn, of gas-phase mixture quality. …