摘要
本文利用FLUENT6.0软件,数值研究了超临界压力下水在光管内作层流流动和换热特性,着重考察了重力引 起的二次流的影响。研究发现垂直管中由于浮力作用,速度曲线不再是抛物线,而成M状,并在壁面附近出现峰值;重 力作用下,物性的剧烈变化在水平管垂直流动方向引起了很强的二次流,从而影响了阻力特性和换热特性。
Because of the rapid variation of fluid properties across the critical point under supercritical pressure, there is strong secondary flow in heated pipe, which will certainly complex the problem of heat transfer of fluid in pipe. In this paper, a numerical study is conducted for the laminar developing mixed convective heat transfer of water flowing in pipe under supercritical pressure. The velocity field and temperature field are given, the influence of different parameters on flow and heat transfer is investigated in detail. The results show that secondary flow has a great influence on velocity and temperature distributions and thus can also remarkably affect the friction factor and the Nusselt number.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第1期76-79,共4页
Journal of Engineering Thermophysics
基金
国家重点基础研究规划(973)资助项目(No.1999022308)
关键词
超临界
拟临界
混和对流
二次流
换热
supercritical
pseudo-critical
mixed convection
secondary flow
heat transfer
