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首页> 外文OA文献 >Effects of Centrifugal Buoyancy and Reynolds Number on Turbulent Heat Transfer in a Two-Pass Angled-RIB-Roughened Channel with Sharp 180° Turns Investigated by Using Large Eddy Simulation
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Effects of Centrifugal Buoyancy and Reynolds Number on Turbulent Heat Transfer in a Two-Pass Angled-RIB-Roughened Channel with Sharp 180° Turns Investigated by Using Large Eddy Simulation

机译：离心浮力和雷诺数对双通角度 - 肋粗糙通道中湍流传热的影响，采用大涡仿真研究了尖锐的180°变动

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摘要

The effects of the centrifugal buoyancy and the Reynolds number on heat transfer in a rotating two-pass rib-roughened channel with 180° sharp turns were numerically investigated by using the large eddy simulation. The effect of the Reynolds number was seen in the finer flow structure. The effect of the aiding/opposing buoyancy contributions was seen more vigorously on the pressure surface than that on the suction surface, though the details depended on the Reynolds number, the rotation number, and the existence of the ribs. As the buoyancy increased, the friction factor dominated by the pressure loss of the sharp turn decreased, and the decreasing rate is smaller for the higher rotation speed case. The Colburn's j factor stayed almost constant irrespective of the rotation speed. As a result, the heat transfer efficiency index slightly increased by the buoyancy, and it became smaller for the higher rotation speed and higher Reynolds number cases.
机译：通过使用大涡流模拟，在数值上研究了离心浮力和雷诺数对旋转双通肋粗糙化通道中的热传递的影响。在更精细的流动结构中看到了雷诺数的效果。在压力表面上更剧烈地剧烈地看到辅助/相反的浮力贡献的效果，但是细节依赖于雷诺数，旋转数和肋的存在。随着浮力的增加，由急转弯的压力损失为主的摩擦因子降低，并且对于较高的旋转速度壳体，降低速率较小。 Colburn的J因子与转速无关紧要。结果，通过浮力略微增加传热效率指数，对于较高的旋转速度和更高的雷诺数案例变小。

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