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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Effect of rib spacing on heat transfer and friction in a rotating two-pass square channel with asymmetrical 90-deg rib turbulators
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Effect of rib spacing on heat transfer and friction in a rotating two-pass square channel with asymmetrical 90-deg rib turbulators

机译：肋骨间距对带有不对称90度肋骨湍流的旋转两通方槽中传热和摩擦的影响

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摘要

Effect of rib spacing on heat transfer and friction in a rotating two-pass square channel is experimentally investigated. The Reynolds numbers and rotation numbers vary from 20000 to 50000 and 0 to 0.8, respectively. The 90-deg ribs are arranged on leading and trailing surfaces asymmetrically with height-to-hydraulic diameter (e/D-h) ratio of 0.1. The rib pitch-to-height (p/e) ratio on the pressure side varies from 3.8 to 14.4 at positive rotational direction, while keeps the constant value of 10 on the suction side. The results indicate that the rib spacing effect is more pronounced in the first radially outward flow passage than the second passage. Rotation reduces rib spacing effect and p/e = 10 has the best surface average heat transfer enhancement except for the trailing wall of the first passage. As more ribs are added, the channel friction increases until p/e down to 5. But rotation cause lower pressure drop at low rotation number for most cases. The very close rib spacing of p/e = 3.8 has the best thermal performance for positive rotational direction. For negative direction, p/e = 10 turns to be the best rib spacing ratio. (C) 2015 Elsevier Ltd. All rights reserved.
机译：实验研究了肋间距对旋转两通方槽中传热和摩擦的影响。雷诺数和旋转数分别从20000到50000和0到0.8。 90度肋不对称地布置在前表面和后表面上，高度与液压直径（e / D-h）之比为0.1。压力侧的肋节距高度（p / e）在正向旋转时从3.8变为14.4，而在吸力侧则保持为10的恒定值。结果表明，肋的间隔效应在第一径向向外流动通道中比第二通道更明显。旋转减小了肋间距效应，并且p / e = 10具有最佳的表面平均传热效果，除了第一通道的后壁。随着添加更多的肋，通道摩擦会增加，直到p / e降至5。但是在大多数情况下，旋转会导致较低的转数下较低的压降。 p / e = 3.8的非常紧密的肋骨间距在正向旋转方向上具有最佳的热性能。对于负方向，p / e = 10圈是最佳的肋骨间距比。 （C）2015 Elsevier Ltd.保留所有权利。

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