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- W775577263 abstract "This thesis discusses the production and use of laser-machined boiling gridsthat provide controlled nucleate boiling and enhanced heat transfercharacteristics for application primarily to IC engine cooling systems.The surface features of heated plates are known to have a significant effect onnucleate boiling heat transfer and bubble growth dynamics. Nucleate boilingstarts from discrete bubbles that form on surface imperfections, such ascavities or scratches. The gas or vapours trapped in these imperfections serveas nuclei for the bubbles. After inception, the bubbles grow to a certain sizeand depart from the surface. The bubble departure process significantlyincreases heat transfer rates compared to pure convection. In this work, special heated surfaces were manufactured by laser machiningcavities into polished aluminium plates. This was accomplished with anNd:YAG laser system, which allowed drilling of cavities of a knowndiameter. The size range of cavities was 25 to 300 micrometers. The resultingnucleate pool boiling was analysed using a high-speed imaging systemcomprising an infrared laser and high resolution CCD camera. This systemwas operated up to a 2 kHz frame rate and digital image processing allowedbubbles to be analysed statistically in terms of departure diameter, departurefrequency, growth rate, shape and velocity. Data were obtained for heatfluxes up to 150 kW.m'2. Bubble measurements were obtained working withwater at atmospheric pressure. The surface cavity diameters were selected tocontrol the temperature at which vapour bubbles started to grow on thesurface. The selected size and spacing of the cavities was also explored toprovide optimal heat transfer. Insights into the interaction and interseedingmechanism were obtained.The research has demonstrated that nucleate boiling can be controlled byoptimally sized and spaced laser-machined cavities in heated metal surfaces." @default.
- W775577263 created "2016-06-24" @default.
- W775577263 creator A5030270139 @default.
- W775577263 date "2004-01-01" @default.
- W775577263 modified "2023-09-27" @default.
- W775577263 title "Control of nucleate boiling with micro-machined surface features." @default.
- W775577263 hasPublicationYear "2004" @default.
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