Abstract:

The rectangular channel with small-scale vortex generators of different heights was numerically simulated.The value of Reynolds number was from 4000 to 10000.The result showed that the characteristics of convective heat transfer and pressure drop changed because of the difference in heights of small-scale vortex generators.The mechanism of longitudinal vortices and spanwise vortices produced by small-scale vortex generators and their effects on heat transfer enhancement were analyzed.Meantime，the influence of vortices on the pressure in the channel was analyzed.The heat transfer and drag characteristics of small-scale vortex generators were evaluated with a comprehensive criterion that considered both convective heat transfer and flow drag.

摘要：

采用数值模拟方法，对布置有不同高度小尺度涡流发生器的矩形槽道，在Re=4000～10000的范围内进行了模拟计算。结果表明，小尺度涡流发生器由于其高度的不同引起对流换热和压差的变化，分析了小尺度涡流发生器所诱导的流向涡和展向涡对强化传热影响的内在机理，并对所产生的涡旋对槽道中压力分布的变化进行了分析。采用一种综合考虑对流换热和流动阻力的评价标准对不同高度小尺度涡流发生器的传热和流阻特性进行对比评价。