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首页> 外文期刊>International Journal of Rotating Machinery >Effects of Centrifugal Buoyancy and Reynolds Number on Turbulent Heat Transfer in a Two-Pass Angled-RIB-Roughened Channel with Sharp180∘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 Sharp180∘Turns Investigated by Using Large Eddy Simulation

机译：利用大涡模拟研究离心力和雷诺数对Sharp180∘Turns两道带角度RIB粗化通道内湍流传热的影响

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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 with180∘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'sjfactor 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：通过大涡模拟，数值研究了离心浮力和雷诺数对旋转的180度急转弯两通肋粗化通道内传热的影响。在更精细的流动结构中可以看到雷诺数的影响。尽管在细节上取决于雷诺数，转数和肋的存在，但在压力表面上比在抽吸表面上更能看到辅助/相反的浮力作用。随着浮力的增加，由急转弯的压力损失决定的摩擦系数减小，并且对于较高转速的情况，减小率较小。无论旋转速度如何，科尔本的因子几乎保持恒定。结果，由于浮力，传热效率指数略有增加，并且对于更高的转速和更高的雷诺数情况，传热效率指数变小。

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