CAJ | 학술논문

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(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 Al2 O3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。
실험연구료제도공밀도통공금속포말적지비등전열성능。공질위거리자수,제도공밀도금속포말재질위동화얼,공극솔위0.98,포말후도위4~14 mm。실험결과표명：상비우단층포말,제도공밀도금속포말현저적증강료비등전열능력,단증강정도수공밀도변화제도、포말후도화재료적영향；제도공밀도포말적지비등전열성능수착표면활성제 SDS(sodium dodecyl sulfate)농도적증대이감소,이차 SDS강저료제도공밀도금속포말적림계열류밀도；첨가 Al2 O3납미과립엄중적삭약료제도공밀도동포말적지비등전열능력。
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 Al2 O3 nanoparticles severely weakens the pool boiling heat transfer of copper foam with gradient pore densities.