Abstract
Due to the progress realised by the semiconductor manufacturers, power electronic components are now able to dissipate heat flux densities that can reach 400 W/cm 2. The use of water two- phase properties seems convenient to evacuate such high heat flux densities. This paper presents a methodology of an evaporator design versus power electronics specificities. After computed total pressure drop, critical heat flux, we determine channel diameter and the flow rate which minimise wall temperature and the required pumping power permitting the flow of water through the channels. Due to low flow rates, the two-phase heat transfer coefficient is obtained with a correlation based on nucleation instead of convection. Then, comparison with an evaporator with the same pressure drop and a pumping power single-phase heat exchanger allows us to show the advantages of the two-phase heat transfer.
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