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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal performances of enhanced smooth and spiky twisted tapes for laminar and turbulent tubular flows
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Thermal performances of enhanced smooth and spiky twisted tapes for laminar and turbulent tubular flows

机译：增强的光滑而尖锐的扭曲胶带的热性能，适用于层流和湍流的管状流

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摘要

This experimental study investigates the heat transfer properties over developing and developed flow regimes, the pressure drop coefficients and the thermal performance factors (TPF) of tubular flows with the continuous and spiky twist tapes enhanced by perforated, jagged and notched winglets. The axial distributions of Nusselt number (Nu) and the mean Fanning friction factors (f) of the tubular flows at Reynolds numbers (Re) ranging from 500 to 40000 are comparatively examined for five different types of twisted tapes with three twist ratios (y) of 1.875,2.186 and 2.815 for each type of twisted tapes. Through this comparative study, the favorable types of twisted tapes which generate the higher degrees of HTE impacts over the developing and developed flow regimes are respectively identified. These newly devised twist tapes enrich the varieties of passive heat transfer enhancement (HTE) devices, especially for retrofit applications. A set of selective Nu and f results illustrates the thermal characteristics of the enhanced tubular flows by these twisted tapes. The HTE and TPF properties for all the present types of twisted tapes are subsequently compared with those reported for other types of twisted tapes in the literature. Among these comparative groups, the present V-notched spiky twisted tape generally offers the highest HTE impacts with favorable TPF performances. Empirical correlations that evaluate the averaged Nu over the developing and developed flow regimes; as well as and tube-wise averaged/for the enhanced tubular flows fitted with all the present types of twisted tapes are generated.
机译：这项实验研究调查了在连续流动和尖刺捻转带的带孔，锯齿状和带缺口小翼增强的条件下，在发展和发展的流动状态下的传热特性，管流的压降系数和热性能因子（TPF）。对于具有三种扭曲比（y）的五种不同类型的扭曲带，比较检查了努氏数（Nu）的轴向分布和雷诺数（Re）在500至40000范围内的管状流体的平均范宁摩擦因子（f）。每种类型的扭曲带分别为1.875、2.186和2.815。通过这项比较研究，分别确定了在发展中和发展中的流动方式中产生较高程度的HTE影响的扭曲带。这些新设计的缠绕带丰富了无源传热增强（HTE）设备的种类，特别是用于翻新应用。一组选择的Nu和f结果显示了这些扭曲带增强的管状流动的热特性。随后将所有当前类型的扭曲带的HTE和TPF特性与文献中其他类型的扭曲带所报告的HTE和TPF特性进行比较。在这些比较组中，目前的V形尖刺扭曲带通常提供最高的HTE影响，并具有良好的TPF性能。经验相关性，用于评估发展中和发达流动状态下的平均Nu值；以及生成与所有当前类型的扭曲带相匹配的增强管流动的管平均和管平均。

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