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首页> 外文期刊>Journal of enhanced heat transfer: Theory and application in high performance heat and mass transfer >EXPERIMENTAL INVESTIGATION OF THE INFLUENCES OF FLUID PROPERTIES ON HEAT TRANSFER FOR SPRAY COOLING
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EXPERIMENTAL INVESTIGATION OF THE INFLUENCES OF FLUID PROPERTIES ON HEAT TRANSFER FOR SPRAY COOLING

机译：EXPERIMENTAL INVESTIGATION OF THE INFLUENCES OF FLUID PROPERTIES ON HEAT TRANSFER FOR SPRAY COOLING

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With electrification of the power train, spray cooling becomes more and more important for automobile applications and its electronic components; this investigation focuses on heat transfer performance of spray cooling under automobile boundary conditions. These conditions include wall temperatures below boiling temperature of the fluid, small nozzle-to-target distances, low nozzle pressures, and a vertically positioned target. In order to enable direct contact of the fluid with the electronic components, electrically insulating fluids need to be used. The properties of these dielectric fluids vary in a wide range. Hence this investigation puts special emphasis on the influence of fluid properties on spray cooling. As a working medium, water and two water-glycerol mixtures at different temperatures were used to imitate viscosities of exemplary dielectric fluids. The investigated Prandtl numbers range between 5 and 283. To measure heat transfer, an experimental setup based on a steady-state measurement principle was used. A Nusselt correlation, depending on Prandtl and Reynolds number, is proposed. The measurement results of heat transfer showed an almost linear dependency on mass flow rate, if spray droplets were impinging on the target. For lower Reynolds numbers, where no spray forms, but an impinging jet sustains, lower heat transfer is observed and the linear dependency does not hold. The level of atomization of the filament, whether it is fully atomized or still in tulip stage, seems to have a negligible influence on the heat transfer dependency under the boundary conditions considered in this investigation.

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