驻点磁流体边界层流动、传热和传质的模拟  

Numerical Simulation of Flow,Heat Transfer and Mass Transfer for Stagnation Point MHD Layer Flow

作　　者：田溪岩[1] 刘玉强[1,2] 雷洪[1] 李本文[3] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819 [2]英特尔半导体(大连)有限公司,辽宁大连116600 [3]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《东北大学学报（自然科学版）》2017年第9期1268-1273,共6页Journal of Northeastern University(Natural Science)

基　　金：教育部青年教师科研创新基金资助项目(N160904003);国家自然科学基金青年基金资助项目(11302047);国家自然科学基金和上海宝钢集团联合资助项目(U1460108)

摘　　要：水平方向放置一无限长高温可渗透多孔介质平板,竖直方向施加稳恒磁场,温度较低的导电流体垂直冲击该平板后,在平板驻点附近会形成很薄的边界层,边界层内将发生流动、传热和传质等物理过程,在此过程中要考虑辐射换热的影响.辐射热源项采用Rosseland假设进行简化处理,采用配置点谱方法进行空间离散求解.讨论了抽吸系数、磁场参数、辐射参数、对流换热参数等对边界层内流动、传热和传质及其壁面摩擦系数、努塞尔数和舍伍德数等的影响.结果表明,抽吸系数和磁场参数的增大使得速度边界层变薄,辐射参数增大使得温度边界层变厚.When a heated infinite permeable flat plate made of porous media lays horizontally in a steady magnetic field and an electrically conducting fluid with lower temperature flows vertically towards the plate, a thin boundary layer can be formed in the vicinity of the stagnation point over the plate. The fluid flow, heat transfer and mass transfer within this boundary layer were investigated numerically and the radiation effect was studied. After using the Rosseland approximation to describe the radiative heat flux, the constitutive equations can be solved by the collocation spectral method （CSM） in the domain discretization. The effects of suction/injection parameter （/w ）,magnetic parameter （M ） , radiation parameter （R ） and convection heat transfer parameter on the flow in the boundary layer, heat transfer, mass transfer, skin friction coefficient, Nusselt number and Sherwood number were discussed. The results indicate that with the increasing of fw and M , the flow boundary layer becomes thicker, while the thermal boundary layer becomes thicker with the increasing of R.

关 键 词：驻点 配置点谱方法 边界层 多孔介质 导电流体 

分 类 号：O361.3[理学—流体力学]