矩形窄通道内带纵向涡发生器的传热强化

Heat transfer enhancement in rectangular narrow channel with longitudinal vortex generators

对带有纵向涡发生器的水平矩形窄通道内水的强化传热与阻力特性进行了实验研究，得出了Re在3000～20000（过渡区和湍流区）范围内纵向涡发生器不同安装形式对水的流动与换热特性的影响规律．结果表明：带纵向涡发生器（LVGs）的通道比光通道的传热因子j提高了25％～55％，同时阻力有所增加．在3种不同比较准则（相同泵功、相同压降及相同质量流量）条件下，两侧安装有交叉方向LVGs的通道换热效果较好，顺流方向换热效果略好于逆流方向．

The heat transfer and fluid flow in a horizontal rectangular narrow channel with longitudinal vortex generators （LVGs） mounted on side-walls were studied experimentally. The effect of the form of mounting LVG on heat transfer and fluid flow performance was also investigated with Reynolds number ranging from 3000 to 20000. The LVGs were able to improve the Colburn factor j by 25%-55% at the expense of increased pressure drop. A comparison of thermal performance was made under three constraints （identical mass flow-IMF, identical pressure drop-IPD and identical pumping power-IPP）. The heat transfer performance of the channel with different direction LVGs mounted on two sidewalls was better than that of other tested channels, and the heat transfer performance of parallel-flow was a little better than that of counter-flow.