Numerical study on heat transfer of dry ice sublimation spray cooling on the surface of micro-ribbed plate
Aiming at the temperature control problem of highly integrated and micro-modular electronic components with high heat load,based on CFD two-phase solver,the heat transfer characteristics of dry ice sublimation spray cooling on the surface of micro-ribbed plate were studied by numerical experiments.The results show that the temperature,heat transfer coefficient and cooling heat flux on the surface of micro-ribbed plate and the upper surface of heat source are basically annular distribution.The closer to the center,the more dry ice particles,the lower the temperature and the higher the cooling performance.The center temperature on the center line of the upper surface of the heat source is the lowest,and its cooling heat flux and heat transfer coefficient are M-shaped.When the inlet velocity of the nozzle and the proportion of dry ice increase,the heat transfer coefficient and cooling heat flux on the surface of the simulated heat source also increase,while the temperature decreases as a whole.The optimal cooling heat flux of 170 W/cm2 and the optimal heat transfer coefficient of 12500 W/(m2·K)were obtained when the nozzle inlet speed was 20 m/s and the dry ice ratio was 40%.
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