多孔金属和方柱复合结构池沸腾数值模拟研究

Numerical simulation of nucleate boiling in porous metallic foam and square column composite structure

中文关键词: 多孔金属  方柱  复合结构  池沸腾  LBM模拟

英文关键词: Porous Metallic Foam  Square Column  Composite Structure  Nucleate Boiling  Lattice Boltzmann Method

中文摘要:

      本文针对一种多孔金属和方柱复合结构,采用双粒子分布函数格子Boltzmann方法对其池沸腾传热进行数值模拟研究。分别调整了下部方柱的柱宽/槽宽(W/D)、柱高H和上部多孔层的厚度,分析了不同结构的沸腾换热曲线和传热机理。流场和温度场分别用密度分布函数和温度分布函数来描述,底部固体采用定压边界条件。研究发现,方柱-多孔层复合结构可以有效的强化沸腾换热。结果表明,低热流密度下,具有较小的W/D的结构换热表现更好,高热流密度下,较大的W/D换热表现更好；换热效果随结构柱高H的增大而增加；多孔层厚度的变化对整体结构的强化效果影响不大。

英文摘要:

      In this paper, the boiling mechanism of a composite structure of porous metal and square column is studied by lattice Boltzmann method. The effects of W/D, H, and n of the metallic foam on boiling heat transfer curves and bubble behaviors were further investigated. We found that the composite structure can enhance the boiling heat transfer effectively. The results show that the a smaller W/D has stronger heat transfer ability at low heat flux and a larger W/D behaves better at high heat flux; structure can achieve better heat transfer performance as the H increases; the change of n has little influence on the heat transfer ability of the overall structure.