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首页> 外文期刊>Experimental Heat Transfer >EXPERIMENTAL INVESTIGATION OF LOCAL HEAT TRANSFER IN A SQUARE DUCT WITH CONTINUOUS AND TRUNCATED RIBS
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EXPERIMENTAL INVESTIGATION OF LOCAL HEAT TRANSFER IN A SQUARE DUCT WITH CONTINUOUS AND TRUNCATED RIBS

机译：带有连续和截断肋的方形管道中局部传热的实验研究

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摘要

In the present study, the turbulent heat transfer and fiction in a square duct roughened by continuous and truncated ribs on one wall has been investigated experimentally. The ribs are oriented transversely to the main stream in a periodic arrangement. For both cases, the rib height-to-hydraulic diameter ratio is 0.15, the rib pitch-to-height ratio is fixed at 12, and the Reynolds number varies from 8,000-20,000. Liquid crystal thermography is applied to demonstrate detailed distribution of heat transfer coefficient between a pair of ribs. The results show that the horseshoe vortices produced by truncated ribs are quite different from the flow structures altered by continuous ribs. It is noted that continuous ribs give higher heat transfer augmentation and pressure drop than truncated ribs. Moreover, the truncated ribs cannot be employed to eliminate hot spots which occur in the corresponding continuous types.
机译：在本研究中，已经通过实验研究了在一个壁上被连续的和截断的肋所粗糙化的方管中的湍流传热和虚构。肋以周期性布置横向于主流定向。对于这两种情况，肋骨的高度与液压直径之比为0.15，肋骨的间距与高度之比固定为12，雷诺数为8,000-20,000。应用液晶热成像法来证明一对肋之间的传热系数的详细分布。结果表明，截断肋产生的马蹄形涡流与连续肋改变的流动结构完全不同。注意连续的肋比截短的肋提供更高的传热增加和压降。而且，截棱线不能用来消除在相应连续类型中出现的热点。

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