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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow and heat transfer around a diamond-shaped cylinder at moderate Reynolds number
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Flow and heat transfer around a diamond-shaped cylinder at moderate Reynolds number

机译：雷诺数适中的菱形圆柱体周围的流动和热传递

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Hydrodynamics and heat transfer around a diamond-shaped cylinder in a stationary flow have been investigated using direct numerical simulation. Simulations were carried out for a steady flow with a Reynolds numbers ranging from 1 to 70 and for a Prandtl number corresponding to a gas (Pr = 0.7). The study focuses on the influence of the diamond apex angle a (33 <= alpha <= 120 degrees) on the evolution of drag, wake length and Nusselt number. A comparison with the case of a circular cylinder is performed. It is shown that the drag coefficient of a diamond-shaped cylinder remains very close to the one of a circular cylinder (+/- 10%) for Re < 10 and that it is reduced by decreasing the apex angle for Re > 10. In the same time, compared to the circular cylinder case, the reduction of the apex angle postpones significantly the Reynolds corresponding to the wake recirculation onset. When the Reynolds reference velocity is, as often, taken as the far field velocity, the corresponding Nusselt numbers are found to decrease with the apex angle a. However, it is found that when the reference velocity is based on the maximal vorticity near the equator, the Nusselt number of diamond-shaped cylinders seems to collapse on a single master curve. This may indicate that the relevant velocity scale to describe Nusselt variation, and thus the heat transfer, is dependant on the interfacial vorticity intensity rather than on the far field velocity. (C) 2019 Elsevier Ltd. All rights reserved.
机译：使用直接数值模拟研究了固定流动中菱形圆柱体周围的流体动力学和热传递。对雷诺数为1至70的稳定流以及与气体相对应的普朗特数（Pr = 0.7）进行了模拟。该研究的重点是钻石顶角α（33 <= alpha <= 120度）对阻力，尾流长度和努塞尔数的演变的影响。与圆柱体的情况进行比较。结果表明，对于Re <10，菱形圆柱体的阻力系数保持非常接近圆柱之一的阻力系数（+/- 10％），并且对于Re> 10，通过减小顶角减小阻力系数。同时，与圆柱体情况相比，顶角的减小明显延迟了与尾流再循环开始相对应的雷诺。通常将雷诺参考速度视为远场速度时，发现相应的努塞尔数随顶角a减小。但是，发现当参考速度基于赤道附近的最大涡度时，菱形圆柱的努塞尔数似乎在一条主曲线上坍塌。这可能表明描述Nusselt变化以及因此传热的相关速度标度取决于界面涡度强度，而不是远场速度。 （C）2019 Elsevier Ltd.保留所有权利。

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