窄间隙矩形通道内纵向涡有效作用距离初步研究

EFFECTIVE INFLUENCE DISTANCE OF LONGITUDINAL VORTEX IN NARROW RECTANGULAR CHANNEL

由于纵向涡发生器(LVG)作用距离远、结构简单、安装高度低,对于一些具有窄间隙通道的换热结构,纵向涡(LV)强化传热有着较强的应用价值。在窄间隙矩形通道水介质条件下应用这种技术时,LV的有效作用距离直接关系到传热强化效率和是否具有推广应用的价值。本文采用数值模拟方法对这一问题进行了模拟,并采用旋涡强度剩余率作为判别依据,结果表明在本文参数范围内,纵向涡有效作用距离为LVG高度的68.3～77.4倍,并且这一范围与Re数关系不大。

With relative long influence distance and simple structure,the longitudinal vortex generators（LVGs） can be used in narrow channels with flat surface in order to enhance heat transfer. The influence distance of longitudinal vortex（LV） is very important to extend this kind of technology in narrow rectangular channel with water as the working fluid.In this paper,this problem is numerically studied and based on the residual rate of vortex intensity,the effective influence distance of LV is 68.3～77.4 times of LVG height,which is independent on the Reynolds numbers.