微通道内滑移区气体-颗粒流动传热数值模拟  

Numerical Simulation of Gas-particle Flow and Heat Transfer in Slip flow Regime in a Microchannel

作　　者：周俊[1] 刘振宇[1] 吴慧英[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《工程热物理学报》2017年第3期581-586,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目资助(No.51536005;No.51676124);国家基金委创新群体项目(No.51521004)

摘　　要：本文针对微通道内气粒间流动传热过程开展数值研究,所建模型中气体处理为可压缩/变物性流体,并在气固交界处采用速度滑移和温度跳跃边界条件以考虑其微尺度效应。在数值研究基础上,分析了微通道受限空间、克努森数、气体流速以及颗粒表面温度对微通道内气粒换热的影响。研究结果表明,受限空间结构将强化气粒间换热过程,颗粒表面平均传热努赛尔数随微通道气体流量增大而增大,克努森数增大以及颗粒表面温度升高都将导致颗粒表面平均传热努赛尔数减小。In this paper,a numerical model considering the compressibility and variable properties of gas fluid was established to simulate the gas-particle flow and heat transfer in the microchannel.The velocity slip and temperature jump boundary conditions were implemented at the gas-particle interface in the numerical modeling.The influences of microchannel confined space,Knudsen number,gas velocity and particle surface temperature on the heat transfer between gas and particle were studied based on the numerical predictions.The results show that the heat transfer is enhanced due to the confined space of microchannel.Moreover,the average Nusselt number increases with increasing gas flow rate,while it decreases with the increases of Knudsen number and particle surface temperature.

关 键 词：微尺度传热 气粒两相流 数值模拟 微通道 

分 类 号：TK124[动力工程及工程热物理—工程热物理]