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过程工程学报 ›› 2020, Vol. 20 ›› Issue (7): 852-859.DOI: 10.12034/j.issn.1009-606X.219310

• 材料工程 • 上一篇    下一篇

基于泡沫金属的复合毛细芯的物性测试

汪冬冬*， 刘朋杰， 楚化强， 王金新， 卢厚杨   

  1. 安徽工业大学能源与环境学院，安徽 马鞍山 243002
  • 收稿日期:2019-10-09 修回日期:2019-11-17 出版日期:2020-07-22 发布日期:2020-07-21
  • 通讯作者: 汪冬冬 wangdd526@163.com
  • 基金资助:
    国家自然科学基金;安徽省自然科学基金项目

Physical properties test of a composite porous wick based on foam metal

Dongdong WANG*, Pengjie LIU, Huaqiang CHU, Jinxin WANG, Houyang LU   

  1. School of Energy and Environment, Anhui University of Technology, Ma?anshan, Anhui 243002, China
  • Received:2019-10-09 Revised:2019-11-17 Online:2020-07-22 Published:2020-07-21

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摘要： 为改进毛细芯的传热传质性能，以泡沫金属铜或镍为骨架，在其内部填充树形金属铜粉或镍粉，通过树形金属粉末调控泡沫金属内的孔隙结构及孔径分布，制备出一种以金属泡沫为基底的复合毛细芯，并对制备的复合毛细芯的孔隙率、抽吸性能、有效热导率及蒸发率进行研究。结果表明，这种结构的复合毛细芯孔隙率较高，有效热导率为4.1?9.8 W/(m?K)。从毛细芯毛细抽吸、有效热导率和蒸发率综合来看，以金属泡沫镍为骨架、树形镍粉末与造孔剂质量比为5:5的复合毛细芯性能最好。

关键词: 泡沫金属, 复合毛细芯, 抽吸性, 导热系数, 蒸发率

Abstract: In order to improve the heat and mass transfer performance of porous wicks, a composite porous wick was prepared by using copper or nickel foam as the skeleton and filling with the dendritic copper or nickel powders in this work. The foam metal can provide reliable porous framework and good heat transfer performance. And the dendritic metal powders can regulate the pore structure and pore size distribution inside the foam metal. The physical properties of the composite porous wick, including the porosity, capillary pumping capacity, effective thermal conductivity and evaporating rate, were studied experimentally. The prepared composite porous wicks had high porosity and low effective thermal conductivity in the range of 4.1?9.8 W/(m?K). According to the filling amount of metal powders and the microstructure of samples, the foam nickel and dendritic nickel powder were the most suitable combination for loose sintering of composite porous wick. Porosity had little effect on capillary pumping capacity of the composite porous wicks, but the porous structure and pore size distribution of porous wicks can cause the obvious effect. Due to the use of metal foam as skeleton, partial evaporation can be formed locally on the surface of composite porous wicks, and heat transfer equilibrium can be achieved by surface evaporation at low heat load of 30 W. Increase the heat load to 50 W or 70 W, local temperature on composite porous wick was over 100℃, and heat transfer entered the meniscus evaporation inside composite porous wick. Based on capillary pumping characteristics, effective thermal conductivities and evaporating rates in these porous samples, the composite porous wick with nickel foam as the skeleton and the mass ratio of dendritic nickel powder to the pore former of 5:5 had the best performance. The simple preparing method for the composite porous wick was proposed, and it was expected to be used for further practical application in loop heat pipe.

Key words: foam metal, composite porous wick, capillary pumping, thermal conductivity, evaporating rate