Empirical Analysis of Two-Phase Confined Impinging Jet Heat Transfer Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/0r967558x

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  • Advances in electronics fabrication, coupled with the demand for increased computing power, have driven the demand for innovative cooling solutions to dissipate waste heat generated by these devices. To meet future demands, research and development has focused on robust two-phase heat transfer devices. A confined impinging jet is explored as a means of utilizing two-phase heat transfer. How this technology may be applicable to desalination is highlighted. The test configuration consists of a 4 mm diameter jet of water, at a subcooled temperature of 10 degrees Celsius, which impinges on a 38 mm diameter heated aluminum surface. Experimental parameters include inlet mass fluxes ranging from 200 to 400 kg/m²-s, confinement gap height to nozzle diameter ratios from 0.125 to 0.5, and input heat fluxes from 5 to 50 W/cm². The influence of the testing parameters on the heat transfer performance is assessed. Conditions of the heater surface strongly influence heat transfer performance. Procedures were established to prepare an aluminum heating surface with repeatable surface characteristics. Existing confined impinging jet heat transfer correlations based on two-phase inlet conditions were modified for single-phase inlet conditions with two-phase flow within the confinement region.
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