空气横掠叉排三维外肋管束换热及流阻特性的实验研究

对由重庆大学研制开发的新型三维外肋管叉排管束的换热及流动特性进行正交优化实验研究。实验结果表明：与光管管束相比，在Re=2900-14000范围内，三维外肋管束的换热系数增大了1.5-2.5倍，阻力增大了1－3.5倍。对实验数据进行逐步回归，得出了实验条件下的换热及流阻的准则方程式，并对肋几何参数对换热及流阻的影响进行了分析。

Heat Transfer and Friction Characteristics for Cross-flow over Staggered External Three-dimensional Finned Tube Banks

In this paper, the heat transfer and friction characteristics for cross-flow over staggered new external three-dimensional finned tube banks developed by the Chongqing University of China are investigated by means of cross optimization experiment. The results of experiment show that the rate of heat transfer is enhanced from 1.5 to 2.5 and the ratio of pressure drop is increased from 1 to 3.5 compared to the bare tubes in the range of Reynolds numbers Re=2 900-14 000. The heat transfer and friction factor correlations are obtained through step by step regression and then, the influence of geometric parameters of fins on the characteristics of heat transfer and friction is analyzed.