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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study on heat transfer behavior of wavy channel supercritical CO_2 printed circuit heat exchangers with different amplitude and wavelength parameters
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Numerical study on heat transfer behavior of wavy channel supercritical CO_2 printed circuit heat exchangers with different amplitude and wavelength parameters

机译：不同幅度和波长参数的波浪通道超临界CO_2印刷电路板换热器传热行为的数值研究

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摘要

Performance enhancement of printed circuit heat exchanger (PCHE) is of great importance to the thermal efficiency improvement of supercritical CO_2 Brayton cycle. In this paper, the heat transfer performance and flow characteristics of a sinusoidal wavy channel PCHE are numerically investigated. The effects of the amplitude and wavelength parameters are discussed under different mass flow conditions with inlet Re = 5210.8-13026.9 on the hot side. It's found that the increase of amplitude and decrease of wavelength result in larger flow length and heat transfer area of the wavy channel, as well as higher heat transfer rate. The use of wavy channel instead of straight channel enhances heat transfer. Because of the complicated flow fields in the wavy channels affected by thermophysical property changes and centrifugal forces, the shapes and locations of high heat flux zones shift with different configurations. The secondary flow and heat transfer area change both contribute to the change of heat transfer characteristics. The resulting complicated heat transfer performance variation of different configurations are illustrated and discussed. Based on the overall performance evaluation results, the best performance is obtained with an amplitude of 3 mm and a wavelength of 50 mm or 75 mm.
机译：印刷电路换热器（PCHE）的性能提高对于超临界CO_2布雷顿循环的热效率提高至关重要。本文对正弦波状通道PCHE的传热性能和流动特性进行了数值研究。讨论了在不同质量流量条件下，热端入口Re = 5210.8-13026.9时振幅和波长参数的影响。研究发现，振幅的增加和波长的减小会导致较大的流动长度和波状通道的传热面积，以及更高的传热速率。使用波浪形通道代替直线形通道可增强热传递。由于受热物理性质变化和离心力影响的波浪通道中的流场复杂，因此高热通量区域的形状和位置会以不同的配置发生变化。二次流和传热面积的变化均有助于传热特性的变化。说明并讨论了不同配置所导致的复杂的传热性能变化。根据总体性能评估结果，以3 mm的振幅和50 mm或75 mm的波长可获得最佳性能。

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