Numerical study of the effect of cylindrical fin diameter on flow boiling
Microchannel heat sinks are widely used in microelectronic systems.This article proposed three different gradient reduction microchannels with different diameters of cylindrical fins,and used numerical simulation methods to study the flow boil-ing heat transfer characteristics of different microchannels at a heat flux of 100～500 W/cm2.The results show that when the gra-dient is reduced in cylindrical fins,the channel section temperature is the lowest and the heat transfer enhancement effect is the best.As the heat flux increases,the starting point of boiling moves upstream,the rate of bubble formation on the bottom wall in-creases,the convective heat transfer coefficient increases,and the pressure drop also increases;According to the comparison of comprehensive heat transfer coefficient and pressure drop,GF has the best comprehensive enhanced heat transfer effect,followed by BF,SF,UF,and RF.
Cylindrical finsBoiling heat transferHeat transfer performanceFin gradient arrangement
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