摘要
对等热流和等壁温边界条件下圆管内层流脉冲流动对流换热问题进行了数值模拟。在等热流边界条件下的数值计算结果与理论解吻合很好。计算结果表明:在等热流和等壁温边界下脉冲流动可引起速度、温度以及努塞尔数随时间波动,振幅越大,脉冲频率越小,波动越大。但它们的时均值均等于在相同雷诺数下稳态流动的值,脉冲流动不能强化换热。
Numerical analysis on convection heat transfer of laminar pulsating flow in a circular tube with constant heat flux and constant wall temperature is investigated. The results for constant heat flux boundary condition are in agreement with the analytical solutions very well. The numerical results show that the pulsating flow in a circular tube under constant heat flux or constant wall temperature can result in the fluctuation of the velocity, temperature and Nusselt number around the steady ones, the larger pulsating amplitude and the smaller pulsating frequency, the larger fluctuation will be. But their time-averaged values are equal to the steady ones at the same Renolds number; the pulsating flow can not enhance the heat transfer.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第2期319-321,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展规划项目(No.G2000026301)
关键词
层流脉冲流动
对流传热
数值分析
laminar pulsating flow
convection heat transfer
numerical simulation
