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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4~14mm。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(sodium dodecyl sulfate)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。
Experimental study of the pool boiling heat transfer performance of the gradient hole density through-hole metal foam. The working fluid is deionized water. The gradient pore density metal foam is made of copper and nickel with a porosity of 0.98 and a foam thickness of 4 to 14 mm. The experimental results show that compared with the single-layer foam, the gradient hole density metal foam significantly enhances the boiling heat transfer capacity, but the degree of enhancement is affected by the pore density gradient, foam thickness and material; The performance decreases with the increasing concentration of sodium dodecyl sulfate (SDS), and the SDS decreases the critical heat flux density of gradient pore density metal foam. Adding Al2O3 nano-particles seriously impairs the pool boiling of gradient pore density copper foam Heat transfer capacity.