基于LBM的部分热活跃边界下多孔腔体内自然对流换热  

Natural Convection Heat Transfer in a Porous Medium with Partially Thermally Active Walls:Lattice Boltzmann Method

作　　者：孙金丛 杜鹏 李培生[1,2] 张莹 李伟[1] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]上饶师范学院江西省塑料制备成型重点实验室,江西上饶334001

出　　处：《计算物理》2017年第5期583-592,共10页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(51566012);江西省自然科学基金(20151BAB206048);江西省研究生创新专项资金(YC2015-S011)资助项目

摘　　要：采用Boltzmann方法模拟部分热活跃边界下的多孔腔体内自然对流,探讨不同热边界布置方案、孔隙度、Da数及Ra数对其流动传热的影响.数值计算表明:Da=10^(-4)时,腔体内中央出现一个循环流模式,只在Ra数很大时孔隙度才对传热有影响;Da=10^(-2)时,腔体内出现两个循环流,在Ra数很小时孔隙度对传热产生强烈的的影响.热活跃边界位置影响腔体内流体对流传热的强度,加热边界布置在底部、而冷却边界布置在顶部(Bottom-Top布置方式),对多孔腔体内对流传热最有利,优于全热边界布置方式的传热效果.Natural convection heat transfer in a porous medium with partially thermally active walls is studied with lattice Boltzmann method.Convective flow heat transfer with different heating and cooling zones,porosity,Darcy number and Rayleigh number is investigated.It reveals that at Da=10^-4 a circulating flow pattern at the middle of the cavity is found,and porosity have great influence on heat transfer at large Rayleigh numbers;As Darcy number is increased to 10^-2,streamlines exhibit a flow pattern with two vortices,and porosity have great influence on heat transfer at low Rayleigh numbers.Location of partially thermally active walls has significant influence on flow pattern and heat transfer in cavity.Bottom-top with bottom heating and top cooling provides a greater heat transfer rate compared with other partial heating.It is better than fully heated wall of cavity.

关 键 词：多孔腔体 部分热活跃边界 自然对流 孔隙度 

分 类 号：TQ021.1[化学工程]