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Analysis of the convective heat transfer and flow behavior around two counter-rotating side-by-side cylinders

机译：两个反向旋转并排气缸周围的对流传热和流动特性分析

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This study presents details of the heat and fluid flow around two counter-rotating cylinders. For this goal, three different nondimensional gap spaces such as G/D = 1.5, 2.0, and 3.0 are examined in the constant Reynolds number of 200 and Prandtl number of 7.0. In addition, computations are carried out at various nondimensional rotating speeds (R.S) in the range from 0 to 4. The obtained results are validated against the available data in the open literature for stationary cases. The results showed that the flow structure, vortex shedding process, and exerted forces on the cylinders strongly depended on the R.S and G/D. Reductions of the drag coefficients are observed for both cylinders with increasing the R.S due to suppression of the wake downstream of the cylinders at low R.S and eliminating the vortex shedding process at high R.S. Finally, it is demonstrated that, regardless of the G/D value, increasing the R.S diminishes dramatically the convective heat exchange rate between the cylinders and fluid flow.
机译：这项研究详细介绍了两个反向旋转气缸周围的热量和流体流动。为了这个目标，在恒定的雷诺数200和普朗特数7.0中检查了三个不同的无量纲间隙空间，例如G / D = 1.5、2.0和3.0。此外，在0到4范围内的各种无量纲旋转速度（R.S）下进行计算。针对公开情况，针对公开文献中的可用数据验证了所得结果。结果表明，流动结构，涡旋脱落过程以及作用在气缸上的力在很大程度上取决于R.S和G / D。由于在低R.S下抑制了汽缸下游的尾流，并在高R.S​​下消除了涡旋脱落过程，因此随着R.S的增加，两个气缸的阻力系数均减小了。最后，证明了无论G / D值如何，R.S的增加都会显着降低气缸与流体流之间的对流热交换率。

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