Abstract This study investigates the effects of corner radius variation on thermohydraulic parameters around two equal isothermal square cylinders in tandem and side-by-side arrangements. In particular, a two-dimensional numerical study of unsteady laminar-forced convective heat transfer was conducted for a Reynolds number of 100. The Prandtl number was held constant at 0.71. The ratio of cylinder diameter over corner radius was varied from 0.0 to 0.5 with an increment of 0.1. The thermohydraulic parameters such as Strouhal number, drag coefficient, lift coefficient, and Nusselt number were discussed for various spacing ratios. In side-by-side arrangement, the Nusselt number increased for all corner radii with increasing distance between cylinders. However in tandem arrangement, as distance increased from the wake length of upstream circular cylinders, heat transfer was improved for both bodies. Moreover, the mean Nusselt number for the upstream cylinder approached a single cylinder value, while mean Nusselt number for the downstream cylinder was lower than that of a single cylinder. Furthermore, the flow induced vibration was coupled, which enhanced the heat transfer of a single square cylinder.

中文翻译：

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具有角半径变化的圆柱结构的流动和传热特性：串联、并排和流动引起的振动

摘要 本研究研究了角半径变化对串联和并排布置的两个等温方形圆柱体周围热工水力参数的影响。特别是，对雷诺数为 100 的非定常层流强制对流传热进行了二维数值研究。普朗特数保持恒定为 0.71。圆柱直径与拐角半径之比从 0.0 变化到 0.5，增量为 0.1。讨论了各种间距比的热工水力参数，例如 Strouhal 数、阻力系数、升力系数和 Nusselt 数。在并排布置中，随着圆柱之间距离的增加，所有角半径的努塞尔数都增加。然而在串联安排下，随着与上游圆柱体尾流长度的距离增加，两个物体的传热得到改善。此外，上游气缸的平均努塞尔数接近单个气缸的值，而下游气缸的平均努塞尔数低于单个气缸。此外，流动引起的振动是耦合的，这增强了单个方柱的传热。