Study on Rapid Boiling Heat Transfer of Non-Azeotropic Immiscible Mixtures in Submicron Cavitated Microchannels at Ultra-high Heat Fluxes
In this paper,a structurally optimized microchannel two-phase heat exchanger with a large number of submicron nucleation sites was proposed,and the subcooled flow boiling charac-teristic of a non-azeotropic immiscible mixture of HFE-7100 and HFE-7100/water was compared at flow rates of 50～150 L/h and heat fluxes of 50～400 W/cm2.The results showed that the mixture of HFE-7100/water had higher boiling heat transfer efficiency in porous microchannels,lower heat exchanger junction temperature,and less wall superheat required for boiling compared to HFE-7100.In addition,the volume ratio of the binary mixture components had a significant effect on the two-phase heat transfer characteristics,and different operating conditions corresponded to an optimal volume ratio based on the principle of thermal resistance-pumping power minimization.
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