基于LBM的部分热活跃边界下多孔腔体内自然对流换热

计算物理 ›› 2017, Vol. 34 ›› Issue (5): 583-592.

基于LBM的部分热活跃边界下多孔腔体内自然对流换热

孙金丛¹, 杜鹏¹, 李培生^1,2, 张莹¹, 李伟¹

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

收稿日期:2016-06-23 修回日期:2016-09-02 出版日期:2017-09-25 发布日期:2017-09-25
通讯作者: 李培生(1969-),博士生导师,教授,E-mail:lipeisheng@ncu.edu.cn;张莹(1970-),博士生导师,教授,E-mail:yzhang2033@163.com
作者简介:孙金丛(1991-),男,硕士生,主要从事多孔介质内传热传质模拟研究,E-mail:wedjion@163.com
基金资助:
国家自然科学基金（51566012），江西省自然科学基金（20151BAB206048）及江西省研究生创新专项资金（YC2015-S011）资助项目

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

SUN Jincong¹, DU Peng¹, LI Peisheng^1,2, ZHANG Ying¹, LI Wei¹

1. School of Mechatronic Engineering, Nanchang University, Nanchang 330031, China;
2. Jiangxi Key Laboratory of Polymer Preparation and Processing, Shangrao Normal University, Shangrao 334001, China

Received:2016-06-23 Revised:2016-09-02 Online:2017-09-25 Published:2017-09-25

摘要/Abstract

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.

关键词: 多孔腔体, 部分热活跃边界, 自然对流, 孔隙度

Abstract: 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.

Key words: porous medium, partially active walls, natural convection, porosity

中图分类号:

TQ021.1

孙金丛, 杜鹏, 李培生, 张莹, 李伟. 基于LBM的部分热活跃边界下多孔腔体内自然对流换热[J]. 计算物理, 2017, 34(5): 583-592.

SUN Jincong, DU Peng, LI Peisheng, ZHANG Ying, LI Wei. Natural Convection Heat Transfer in a Porous Medium with Partially Thermally Active Walls:Lattice Boltzmann Method[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2017, 34(5): 583-592.

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