顾娟，黄荣宗，刘振宇，吴慧英

上海交通大学 机械与动力工程学院， 上海 200240

通讯作者:吴慧英，女，教授，博士生导师，电话（Tel.）：021-34205299；E-mail: whysrj@sjtu.edu.cn.
作者简介:顾娟（1989-），女，江苏省南通市人，硕士生，主要研究方向为微尺度气体流动传热特性.
基金资助:国家自然科学基金（51536005, 51521004, 51676124）资助项目

Gaseous Flow and Heat Transfer Characteristic in a Microchannel with Different Thermal Boundary Conditions

GU Juan,HUANG Rongzong,LIU Zhenyu,WU Huiying

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

摘要/Abstract

摘要： 构建了微尺度条件下含黏性热耗散和压力功的总能形式的双分布函数格子Boltzmann (LB)模型，计算并分析了恒壁温与恒热流边界条件下，稀薄效应对速度驱动的平直微通道内气体流动与传热特性的影响.结果表明：在不同的热边界条件下，稀薄效应对微通道内气体流动特性的影响一致，即均使得气体流速增大，通道摩擦系数减小；由于气体温度场分布的差异，使得稀薄效应对气体传热特性的影响截然不同，在恒壁温边界条件下气体传热特性有所提高，而在恒热流边界条件下气体传热特性有所减弱.
关键词: 微通道, 换热特性, 格子Boltzmann方法, 稀薄效应
Abstract: The micro total-energy-based double-distribution-function lattice Boltzmann (LB) model with viscous dissipation and compression work was developed to simulate the gaseous flow and heat transfer in a microchannel with uniform wall temperature boundary condition and uniform heat flux boundary condition. The rarefaction effect on gaseous flow and heat transfer characteristic was studied intensively for different uniform Knudsen numbers. The numerical results show that the rarefaction effects on gaseous flow with these two thermal boundary conditions are similar，which can increase the gaseous flow velocity and reduce the friction coefficient. However, due to the different temperature distributions caused by different boundary conditions, the rarefaction effect will have different influences on the heat transfer characteristics. The heat transfer process is enhanced with uniform wall temperature boundary condition and deteriorated with uniform heat flux boundary condition, respectively.
Key words: microchannel, heat transfer characteristic, lattice Boltzmann (LB) method, rarefaction effect


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