单侧带有周期性分布纵向涡发生器的矩形窄通道内传热强化的实验研究

Heat Transfer Enhancement in Rectangular Narrow Channel with Periodically Mounted Longitudinal Vortex Generators on One Sidewall

在换热表面上周期性地安装粗糙元可以使流动区域产生漩涡从而增强换热。对单侧带有周期性分布纵向涡发生器的矩形窄通道内的强化传热进行了实验研究,得出了Re在3×103～2×104的范围内不同流动方向(顺流、逆流)条件下纵向涡发生器对流动与换热特性的影响规律。结果表明:纵向涡发生器对换热有较好的强化作用,同时通道的阻力略有增加。在3种不同比较准则(相同泵功率、相同压降及相同流量)条件下,顺流强化效果均略好于逆流。

Repeated ribs mounted on sidewall in channels are often used to enhance convective heat transfer. In this paper, the heat transfer and fluid flow in a rectangular narrow channel with periodically mounted Longitudinal Vortex Generators （LVGs） on one sidewall was investigated experimentally in the range of Re=3×10^3 and Re=2×10^4. The effect of flow direction on the heat performance was also conducted. It was found that the LVGs are able to greatly improve the comprehensive heat transfer performance.And under three kinds of comparison criterion （Identical Mass Flow-IMF, Identical Pressure Drop-IPD, Identical Pumping Power-IPP）, the heat transfer performance of parallel-flow was a little better than that of counter-flow.