矩形通道内层流对流换热的最优速度场  

OPTIMAL VELOCITY FIELD FOR LAMINAR CONVECTIVE HEAT TRANSFER IN RECTANGULAR CHANNEL

作　　者：宋伟明[1] 孟继安[1] 李志信[1] 

机构地区：[1]热科学与动力工程教育部重点实验室,清华大学航天航空学院,北京100084

出　　处：《工程热物理学报》2011年第1期133-136,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划资助项目(No.2007CB206901)

摘　　要：针对矩形通道内的层流对流换热问题,通过数值求解速度场协同方程,得到了给定黏性耗散条件下通道内的最优速度场为多纵向涡的流动结构,表明多纵向涡流型可在流阻增加不多的情况下使换热显著强化。通过在通道壁面布置不连续双斜肋,在通道内产生了接近于最优速度场的多纵向涡流动,数值计算结果表明,在Re=1000时,与光滑通道相比,不连续双斜肋通道的平均努谢尔数增加61.3%,阻力系数增加79.2%。The optimal velocity field for a given viscous dissipation was numerically obtained by solving the field synergy equation for laminar convective heat transfer in rectangular channel.The results show that the optimal velocity field is a multiple longitudinal vortex flow,which significantly enhances the heat transfer with lower flow resistance increment.The multiple longitudinal vortex flow close to the optimal velocity field could be generated by the discrete double inclined ribs arranged in the rectangular channel.The numerical results show that the averaged Nusselt number in the rectangular channel with discrete double inclined ribs increases by 61.3%and the frictional factor increases by 79.2%for Re=1000 compared with the plain channel.

关 键 词：(火积)耗散极值原理 纵向涡 不连续双斜肋 

分 类 号：TK124[动力工程及工程热物理—工程热物理]