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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer enhancement of transverse ribs in circular tubes with consideration of entrance effect
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Heat transfer enhancement of transverse ribs in circular tubes with consideration of entrance effect

机译：考虑入口效应的圆管横肋传热增强

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摘要

The heat transfer enhancement of transverse ribs in circular tubes with a length-to-diameter ratio of 87 was experimentally investigated. The mean heat transfer and friction data were obtained for the air flow started from the entrance. An isothermal surface condition was considered. The rib pitch-to-tube diameter ratio (p/d) was in the range 0.304- 5.72; the rib height-to-tube diameter ratio (e/d) was in the range 0.015-0.143; the considered Reynolds number (Re) was in the range 4608-12,936. The mean Nusselt number (Nu) and friction factor (f) were individually correlated as a function of p/d, e/d and Re. A critical e/d, equal to 0.057, was found. For e/d < 0.057, the f is proportional to e/d; for e/d ≥ 0.057, the f is proportional to (e/d)~(2.55). A performance map, indicating the corresponding heat transfer enhancement index (r_1) and efficiency index (r_2) for various p/d and e/d, was constructed. This performance map clearly indicates the ranges of p/d and e/d with a high r_2.
机译：实验研究了长径比为87的圆管中横向肋的传热增强。从入口开始获得气流的平均传热和摩擦数据。考虑了等温表面条件。肋节距与管径之比（p / d）在0.304-5.72范围内；肋骨高度与管子直径之比（e / d）为0.015至0.143。考虑的雷诺数（Re）在4608-12,936范围内。平均努塞尔数（Nu）和摩擦系数（f）分别与p / d，e / d和Re的函数相关。发现临界e / d等于0.057。当e / d <0.057时，f与e / d成正比；当e / d≥0.057时，f与（e / d）〜（2.55）成正比。绘制了一个性能图，该图表明了各种p / d和e / d的相应的传热增强指数（r_1）和效率指数（r_2）。该性能图清楚地表明了具有较高r_2的p / d和e / d范围。

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