通道内矩形涡对涡发生器强化换热的数值研究

用数值模拟方法研究了在矩形通道底壁安装矩形涡产生器对(RWP)时纵向涡对层流换热的影响.在雷诺数变化范围为500~7 000,通道底壁安装RWP和不安装RWP两种情况下,比较了流体流动和换热性能.同时对涡产生器的高度和攻角对表面换热性能的影响也做了研究.结果表明:通道的底壁安装RWP可以显著提高换热性,雷诺数越大,换热性越强.随着涡产生器高度的增大,换热性增强,但阻力系数会急剧增加.当攻角为29°时,强化换热效果是最强的.

Numerical Study of Heat Transfer Enhancement by Rectangular Winglet Vortex Generator Pair in a Channel

A numerical simulation is performed to investigate the effect of longitudinal vortices on the heat transfer enhancement of the laminar flow in a rectangle duct mounted with rectangular winglet pair（RWP）on the bottom wall.Reynolds number is defined in two times of channel height ranges from 500 to 7 000.The comparison of the fluid flow and heat transfer characteristics with RWP or without RWP is made.The effect of the height of vortex generator pair and its attack angle on heat transfer performance of channel surface is investigated.The results show that the case with RWP on the bottom wall of the channel can significantly enhance heat transfer.The larger Reynolds number is,the stronger heat transfer enhancement is.With increasing height of RWP,heat transfer is enhanced,but drag coefficient is sharply increased.The heat transfer enhancement is the strongest when the angle of attack is 29 deg.