板翅换热器入口位置不同翅片排列方式对流体流动与换热的影响（英文）  

Influence of fin arrangement on fluid flow and heat transfer in the inlet of a plate-fin heat exchanger

作　　者：Jing-cheng LIU Shu-you ZHANG Xin-yue ZHAO Guo-dong YI Zhi-yong ZHOU 

机构地区：[1]State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University [2]Design Institute of National Technology Research Center,Hangzhou Hangyang Co., Ltd.

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2015年第4期279-294,共16页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Basic Research Program(973)of China(No.2011CB706506);the National Natural Science Foundation of China(No.51375438);the Zhejiang Provincial Natural Science Foundation of China(No.LQ13F030003)

摘　　要：目的:研究板翅换热器入口位置(入口段、导流段以及换热段)在不同翅片排列方式下,换热器流道内流体流动以及温度变化情况,期望得到能够实现最优传热效果的板翅换热器入口位置合理的翅片排列方式。方法:1.构建7种不同入口翅片排列(入口段:导流段:换热段分别为5:8:11,5:8:6,5:8:21,5:4:11,5:16:11,9:8:11和3:8:11),研究不同翅片排列下换热器入口位置流场以及温度场变化。2.分析板翅换热器入口位置6种不同网格划分结果(网格数分别为11962,39344,2120,207998,90738和54496)对计算误差的影响,验证网格收敛性。结论:通过分析板翅换热器入口位置不同翅片排列方式下换热器入口位置流场与温度场变化可以看出,相比入口段与换热段,导流段翅片排列对换热器温度场影响较大。强化导流段翅片排列可以使换热器获得更好的传热效果。Fin arrangement, which can cause temperature to be distributed non-uniformly and decrease heat exchange efficiency, can also affect fluid flow and distribution in different channels of a plate-fin heat exchanger. To reduce fluid maldistribution, the fluid flow and distribution should be investigated systematically. However, there is as yet no research reported on the fin arrangement effect. We investigated fluid flow and heat transfer at the inlet of a plate-fin heat exchanger by numerical calculation combined with simulation analysis. We simulated the fluid flow under seven kinds of fin arrangement, and analyzed the effects. The distribution of fluid parameters in four monitor positions among three sections was examined when the inlet flow velocity was 1 m/s with an inlet structure arranged with different numbers of fins. Denser fin arrangements among inlet, diversion, and heat exchange sections all intensify the turbulence at the outlet. With increase of arrangement density, the fluid flow direction will be changed and the fluid distribution inside the exchanger will be intensified to equalize the fluid temperature in different channels of the same layer. Furthermore, the effects of 18 combinations of fins in different sections on fluid flow were studied. Fin arrangements in different sections have more significant effect on turbulence than flow velocity and pressure; in comparison with the inlet and heat exchange sections, the diversion section has a significant effect on turbulence at the outlet of the heat exchanger.

关 键 词：翅片排列 板翅换热器 传热 湍流 温度均衡 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TK172[动力工程及工程热物理—热能工程]