Numerical simulation study on the flow and heat transfer characteristics of asymmetrical corrugated channels

被引：0
|
作者：
Han H. [1 ]
Yu R. [1 ]
Liao W. [2 ]
机构：
[1] School of Chemical Engineering, Sichuan University, Chengdu
[2] College of Power and Energy Engineering, Harbin Engineering University, Harbin
来源：
Han, Huaizhi (hanhz@scu.edu.cn) | 1600年 / Editorial Board of Journal of Harbin Engineering卷 / 41期
关键词：
Asymmetrical; Corrugated channel; Enhanced heat transfer; Flow characteristics; Heat transfer mechanism; Numerical simulation; Plate heat exchanger; Turbulent flow;
D O I：
10.11990/jheu.201811033
中图分类号：
学科分类号：
摘要：
To explore the influence of corrugated channels' chamfer connection on the flow and heat transfer performance, in this study, numerical simulations are carried out on asymmetrical corrugated channels with large corrugated trough radius (rl) located upstream and downstream. Then, the numbers of average and local characteristics of the wall surface between the symmetrical and asymmetrical corrugated channels are compared under different Reynolds numbers. The results show that the average (Nu) and local Nusselt (Nux) numbers of the wall surface increase as the Reynolds number (Re) increases, and the growth rate of Nu of the symmetrical corrugated channel is greater than that of the asymmetrical corrugated channel. The average friction coefficient (f) and local friction coefficient (fx) of the wall surface decrease as Re increases, and f of the asymmetrical corrugated channel declines below that of the symmetrical one. The Nu of the asymmetrical corrugated channel is slightly smaller than that of the symmetrical corrugated channel, but its f declines significantly. Comparing these two asymmetrical corrugated channels, when large corrugated trough radius (rl) is located upstream, the flow velocity and vortex scale are relatively small, the temperature boundary layer is slightly thicker, the conversion of the pressure gradient is relatively small, and the kinetic energy of turbulence is comparatively low, overall. Based on the aforementioned research, it is recommended that, in the heat exchanger design, rl is selected to locate downstream of the corrugated channel to increase the overall thermal performance. © 2020, Editorial Department of Journal of HEU. All right reserved.
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页码：998 / 1004
页数：6
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