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Determination of Forced Convective Heat Transfer Coefficients on an Array of Disks
Heat Transfer Engineering ( IF 2.3 ) Pub Date : 2021-09-29 , DOI: 10.1080/01457632.2021.1975978
Petros Demissie Tegenaw 1 , Ashmore Mawire 2 , Pieter Verboven 3 , Maarten Vanierschot 1
Affiliation  

Abstract

Forced convection heat transfer due to airflow across an array of thin disks is encountered in various engineering applications. In this work, a three-dimensional steady Reynolds-Averaged Navier-Stokes computational fluid dynamics (CFD) simulation is performed to investigate the phenomenon at the surfaces of an array of disks. A computational grid comprising of a solid domain representing the array of disks and a fluid domain denoting the airflow is set up. A two-step solution procedure is employed whereby first the airflow across the disks is simulated till convergence and then the heat transfer is calculated. The temperature of the air before the array of disks, that of each surface of the disks, and the wall heat flux are monitored to calculate average convective heat transfer coefficients (CHTCs). The CFD model is validated using a wind tunnel experiment and it is shown that both are in close agreement with each other based on the surface temperatures and average CHTC predictions. The CHTCs are found to be significantly higher on the upwind face of the disks compared to the downwind side. Finally, based on the simulations, a correlation based on the non-dimensional average Nusselt number versus Reynolds and Prandtl numbers is derived.



中文翻译:

磁盘阵列上强制对流传热系数的确定

摘要

在各种工程应用中都会遇到由于气流穿过薄盘阵列而导致的强制对流热传递。在这项工作中,执行三维稳态雷诺平均纳维-斯托克斯计算流体动力学 (CFD) 模拟,以研究磁盘阵列表面的现象。建立了一个计算网格,包括一个表示磁盘阵列的实体域和一个表示气流的流体域。采用两步求解程序,首先模拟穿过圆盘的气流直到收敛,然后计算热传递。监测磁盘阵列之前的空气温度、磁盘每个表面的温度和壁热通量,以计算平均对流传热系数 (CHTC)。使用风洞实验验证 CFD 模型,结果表明两者基于表面温度和平均 CHTC 预测彼此非常一致。与顺风面相比,圆盘的上风面的 CHTCs 明显更高。最后,基于模拟,导出了基于无量纲平均努塞尔数与雷诺数和普朗特数的相关性。

更新日期:2021-09-29
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