泡沫金属结构对填充泡沫金属的小间隙通道内流动沸腾特性的影响  

Influence of Metal Foam Structure on Flow Boiling Characteristics in Minigap Channels Filled With Metal Foams

作　　者：朱禹 周瑞东 刘运佳 MUBARAK SALISU 王世学[1] ZHU Yu;ZHOU Ruidong;LIU Yunjia;MUBARAK SALISU;WANG Shixue(School of Mechanical Engineering,Tianjin University,Tianjin 300350,China;National Industry-Education Platform of Energy Storage(Tianjin University),Tianjin 300350,China)

机构地区：[1]天津大学机械工程学院,天津300350 [2]天津大学国家储能技术产教融合创新平台,天津300350

出　　处：《工程热物理学报》2025年第4期1337-1342,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51876138)。

摘　　要：实验研究了去离子水工质在较宽热流密度范围下在填充泡沫金属的水平微小间隙通道内的流动沸腾特性。泡沫金属的材料是铜,孔密度为20和40 PPI,孔隙率为0.95,间隙高度为0.5、1和2 mm。水的质流密度为200∼400 kg·m^(−2)·s^(−1),热流密度最高300 W·cm^(−2)。实验结果表明:在低热流密度下,填充泡沫金属明显增强传热。在高热流密度下,泡沫金属增强传热的效果减弱;泡沫金属延迟了核态沸腾起始点所需要的热流密度;填充泡沫金属通道和平面通道传热系数随质流密度的增大呈现出相同的趋势。填充泡沫金属通道高度对传热系数有影响:低热流密度下,填充泡沫金属的通道和平面通道的传热系数都随着通道高度的减小而增大,在高热流密度下,填充泡沫金属通道的传热系数随通道高度的增大而增大。The flow-boiling characteristics of a deionized water fluid in a horizontal minigap chan-nels filled with metal foams were experimentally investigated over a wide range of heat fluxes.The metal foams are made of copper with the PPI of 20 or 40 and the porosity of 0.95.The working conditions include the mass flux of 200∼400 kg·m^(−2)·s^(−1),the gap height of 0.5∼2 mm and the heat flux up to 300 W·cm^(−2).The experimental results showed that:at low heat fluxes,heat transfer was significantly enhanced by the filled metal foam.At high heat fluxes,the effect of the metal foam in enhancing heat transfer is weakened;the metal foam delays the heat flux required for the onset of nucleation boiling;the heat transfer coefficients of the channels filled with metal foam and the planar channels show the same trend with increasing mass flux.The height of the channels filled with metal foam has an effect on the heat transfer coefficient:at low heat fluxes,the heat transfer coefficient of both the channels filled with metal foam and the planar channels increases with decreasing channel height,and at high heat fluxes,the heat transfer coefficient of the channels filled with metal foam increases with increasing channel height.

关 键 词：流动沸腾 泡沫金属 两相 传热系数 

分 类 号：TK123[动力工程及工程热物理—工程热物理]