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采用电沉积法制备了纳米级树枝状结构与微米级孔穴结构复合的多孔表面,分析了电镀时间对多孔表面结构的影响,制备的多孔表面孔隙率最高可达94.4%,且具有超亲水特性。建立了多孔表面的去离子水池沸腾换热实验系统,对比研究了多孔表面与平表面的池沸腾换热性能,结果表明,多孔表面的临界热流密度239 W/cm~2,最高对流换热系数5.9W/(cm~2K),分别比平表面提高了100%和120%。
The porous surface with nano-scale dendritic structure and micron-scale hole structure was prepared by electrodeposition method. The influence of electroplating time on the porous surface structure was analyzed. The prepared porous surface porosity was up to 94.4% with superhydrophilic character . The experimental system of boiling water in a deionized water tank with porous surface was established. The characteristics of pool boiling heat transfer between porous surface and flat surface were compared. The results showed that the critical heat flux density of porous surface was 239 W / cm ~ 2, the maximum convective heat transfer coefficient 5.9W / (cm ~ 2K), respectively, than the flat surface increased by 100% and 120%.