摘要
分析了微矩形槽道内的不可压缩气体在速度滑移和温度跳跃区的流动和传热过程。在分析模型中 ,假定矩形槽道底面定热流加热 ,其余三面绝热 ,流动和换热均为充分发展 ,且处于滑移流动区。给出了截面上速度分布和温度分布的分析解 ,讨论了阻力特性和换热特性 ,并与实验结果作了比较。二者的吻合程度表明 ,在一定的Knudsen数范围内 ,传统的Navier Stokes方程和能量方程在考虑了速度滑移和温度跳跃影响后可以描述微矩形槽道内的气体流动和传热过程。
This article present the theoretical analysis of gas flow and heat transfer in micro rectangular channels in the regime of velocity slip and temperature jump. The model is built on the assumption that the bottom wall of the channel is in uniform heat flux while the other three walls are adiabatic, and that the flow and heat transfer is of the hydraulic and thermal fully developed laminar flow of the incompressible fluid. Analytic solutions of the cross section distributions of both the velocity and temperature are obtained.The friction and heat transfer performances are discussed. The agreement between analytic solutions and experimental results existed shows that in a definite extension of Knudsen number the traditional Navier Stoks equations and energy equations with the boundary conditions of slip velocity and temperature jump can describe the gaseous flow and heat transfer mechanisms in micro rectangular channels.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第1期99-103,共5页
Journal of Chongqing University
基金
国家自然科学基金"九五"重大资助项目!( 5 9995 5 5 0 3 )
关键词
微矩形槽道
气体
速度滑移
温度跳跃
传热
micro rectangular channel
gas
velocity slip
temperature jump
theoretical analyses
