梯度孔密度金属泡沫的池沸腾传热性能研究  

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

作　　者：徐治国[1] 王美琴 赵长颖[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]中国石油集团川庆钻探工程有限公司长庆井下技术作业公司,陕西西安710018

出　　处：《热科学与技术》2015年第2期106-113,共8页Journal of Thermal Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(2013CB228303);上海市自然科学基金资助项目(15ZR1423400)

摘　　要：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。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 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.

关 键 词：梯度孔密度 金属泡沫 池沸腾 材料 表面活性剂 纳米颗粒 

分 类 号：TK02[动力工程及工程热物理]