不连续冷源布局多孔介质内热流耦合LBM数值模拟  

Lattice Boltzmann Numerical Simulation of Heat-Flow Coupling in a Square Cavity Filled with Porous Media with Partially Colding Wall Layout

作　　者：万启坤 罗松 尚文强 张莹[1] 刘昊天 朱宝杰 WAN Qikun;LUO Song;SHANG Wenqiang;ZHANG Ying;LIU Haotian;ZHU Baojie(School of Mechanical and Electrical Engineering,Nanchang University,Nanchang,Jiangxi 330031,China;Jianglian Energy Environmental Protection Limited Company of Jiangxi,Nanchang,Jiangxi 330096,China;School of Energy Engineering,Zhejiang University,Hangzhou,Zhejiang 310027,China)

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]江西江联能源环保有限公司,江西南昌330096 [3]浙江大学能源工程学院,浙江杭州310027

出　　处：《计算物理》2020年第4期431-438,共8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(20181BAB206031)资助项目。

摘　　要：为研究不连续冷源边界对内置发热体多孔介质方腔内传热及流动的影响,采用格子Boltzmann方法对REV尺度下多孔介质方腔内的自然对流进行计算,并研究瑞利数(Ra)、达西数(Da)、孔隙度对多孔介质方腔内传热流动的影响.发现Da对方腔内的流体流型影响很大,Da为10^-4时,多孔介质方腔内只有一个涡流,而Da为10^-2时,方腔内有两个涡流.增大Ra、Da、孔隙度可以提高冷源壁面的平均努赛尔数(Nu),增强散热效果,孔隙率对平均Nu影响程度和Da的大小有关.当冷源布置在壁面上方,壁面的平均Nu随Ra的增加剧烈变化,方腔处于高Ra条件下时,将冷源布置在边界的上方可以提高散热效果.6种布置方案中Case 6的散热效果最好.Lattice Boltzmann method is used to simulate natural convection in a cavity fill with porous medium under REV scale.Effects of Rayleigh number,Darcy number and porosity on heat transfer and flow in a square enclosure were studied.It is found that Darcy number has a great influence on fluid flow pattern in the cavity.Increasing Rayleigh number,Darcy number,and porosity enhance the heat dissipation effect.Effect of porosity on average Nusselt number is related to Darcy number.As Darcy number is small,porosity has little effect on average Nusselt number.As Darcy number is great,porosity has a great influence on average Nusselt number.As cold source is placed above the wall,average Nusselt number changes dramatically with the increase of Rayleigh number.Under high Rayleigh number condition,cooling effect is improved by arranging the cold source above the boundory.Among the six schemes,Case 6 has the best heat dissipation effect.

关 键 词：LBM 多孔介质 自然对流 NUSSELT数 不连续冷源 

分 类 号：TB611[一般工业技术—制冷工程]