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首页> 外文期刊>International Journal of Heat and Mass Transfer >Aiding and opposing contributions of centrifugal buoyancy on turbulent heat transfer in a two-pass transverse- or angled-rib-roughened channel with sharp 180° turns
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Aiding and opposing contributions of centrifugal buoyancy on turbulent heat transfer in a two-pass transverse- or angled-rib-roughened channel with sharp 180° turns

机译：离心浮力对湍流传热的辅助作用和相反作用，该过程是在180度急转弯的两道横向或斜肋粗糙通道中进行的

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摘要

Centrifugal buoyancy effect on heat transfer in a rotating two-pass rib-roughened channel with 180° sharp turns was numerically investigated by using the large eddy simulation. The effect of the aiding and opposing buoyancy contributions was seen in the suppressed turbulent transport in the radially inward flow, and in larger buoyancy-induced variation of the heat transfer on the pressure surface than that on the suction surface. As the buoyancy increased, the friction factor dominated by the pressure loss of the sharp turn decreased, and Colburn's j factor stayed almost constant. As a result, the heat transfer efficiency index slightly increased by the buoyancy, and it showed almost the same values among the three tested rib arrangements.
机译：通过使用大涡模拟，数值研究了旋转180度急转弯的两通肋粗化通道中离心浮力对传热的影响。在径向向内流中抑制的湍流传输中，以及在浮力导致的压力面上传热的变化大于吸力表面上的传热变化中，可以看到辅助和相反的浮力作用。随着浮力的增加，以急转弯的压力损失为主的摩擦系数减小，而科尔本的j系数几乎保持恒定。结果，传热效率指数由于浮力而略有增加，并且在三个测试的肋结构之间显示出几乎相同的值。

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