梯度孔密度金属泡沫的池沸腾传热性能研究

实验研究了梯度孔密度通孔金属泡沫的池沸腾传热性能。工质为去离子水，梯度孔密度金属泡沫材质为铜和镍, 孔隙率为0.98,泡沫厚度为4-14 mm。实验结果表明：相比于单层泡沫,梯度孔密度金属泡沫显著的增强了沸腾传热能力,但增强程度受孔密度变化梯度、泡沫厚度和材料的影响；梯度孔密度泡沫的池沸腾传热性能随着表面活性剂SDS浓度的增大而减小,而且SDS降低了梯度孔密度金属泡沫的临界热流密度; 添加Al2O3纳米颗粒严重的削弱了梯度孔密度铜泡沫的池沸腾传热能力。

Investigation on pool boiling heat transfer of metal foams with gradient pore densities

Pool boiling heat transfer performances of metal foams with gradient pore densities have been experimentally investigated in saturated deionized water at atmospheric pressure. Foam materials are copper and nickel. Foam porosity is 0.98, and foam thickness ranges from 4 mm to 14 mm. Experimental results show that, compared to single-layer foam, metal foams with gradient pore densities significantly increase pool boiling heat transfer, but the enhancement degree is affected by the foam thickness and material; pool boiling heat transfer performance of metal foam with gradient pore densities decreases with increasing SDS concentration, and adding the surfactant SDS into water makes the CHF reach earlier. Adding Al2O3 nanoparticles severely weakens the pool boiling heat transfer of copper foam with gradient pore densities.