摘要
本文针对微环缝槽道采用速度滑移和温度跳跃边界条件求解了不可压缩气体的Ｎ－Ｓ方程和能量方程，理论分析了微环缝槽道在单侧或双侧不同热流密度加热条件下的流动与层流换热特性，讨论了Ｋｎ数、内外径比对流动阻力及换热特性的影响。结果表明：滑移流区微环继通道内的流阻和Ｎｕｓｓｅｌｔ数明显低于连续流区；且随着Ｋｎ数的增加，流阻和Ｎｕｓｓｅｌｔ数均减小；但其随内外径比ｒ＊的变化趋势与连续流区相似。
In this article, the momentum and energy equations with the boundary conditions of slip velocity and temperature jump are solved for the hydraulic and thermal fully developed laminar flow of the incompressible fluid in micro-annular channel. A theoretical analysis is conducted for flow and heat transfer characteristics in this microchannel on the condition of one wall heated alone with uniform heat flux and two walls heated with different heat flux in slip flow regime. The influences of the Kn number, the ratio of inner diameter to outer diameter and the heat flux ratio on the flow and heat transfer characteristics are discussed, respectively. The results show that the friction coefficient and Nusselt number in the micro-annular channel are smaller than that in the macrochannel, and decrease with the increase of Kn number.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2001年第2期203-206,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金"九五"重大资助项目!(No.59995550-3)
关键词
微环缝槽道
滑移流区
等热流加热
层流换热
层流流动
micro-annular channel
slip flow regime
uniform heat flux
friction coefficient
heat transfer
