烧结/堆积床多孔介质流动沸腾换热实验研究

Experimental Studies of Flow Boiling Heat Transfer in Sintered/Stacking Porous Media

本文实验对比研究了0.3 mm、0.5mm、0.7 mm三种粒径的铜颗粒烧结与堆积床多孔介质中的流动沸腾换热,主要研究了入口流速、热流密度、加热方位及粒径对流动沸腾换热的影响,以及多孔介质中的沸腾滞后。实验结果表明:大入口流速、低热流密度、下方加热以及小粒径时加热壁面的过热度较低,即有利于沸腾换热;本实验所用烧结多孔介质壁面过热度高于堆积床多孔介质,其原因是内部含有闭孔。

The flow boiling heat transfer in sintered and stacking porous media with the particle diameters of 0.3 mm,0.5 mm,and 0.7 mm,was studied experimentally.The influence of the inlet velocity,the heat flux,the position of heating and the particle diameter on the heat transfer,as well as the boiling delay were investigated.The results showed that higher inlet velocities,lower heat fluxes,bottom heating and smaller diameters could result in a lower wall superheat degree,which means better flow boiling heat transfer.The sintered porous media used in the experiments had a higher wall superheat degree,and the reason is that there are obturator cells in the sintered porous media.