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首页> 外文期刊>International Journal of Heat Exchangers >Heat Transfer and Pressure Drop in Spirally Corrugated Tubes
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Heat Transfer and Pressure Drop in Spirally Corrugated Tubes

机译：螺旋波纹管的传热和压降

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摘要

In shell-and-tube heat exchangers some form of surface roughness of the inner tubes is often used to decrease the thermal resistance of the boundary layer. This results in increased heat transfer and hence a heat exchanger with improved thermal performance. However, the roughness also increases the pressure drop, with a corresponding cost increase as a consequence. A well-established method to produce a surface roughness is to corrugate the tubes in a spiral form. In this study five spirally corrugated tubes have been investigated and compared with a smooth tube. The experiments have been carried out with water in the turbulent region, in a range of Reynolds numbers from about 13,000 to 72,000 on the tube side. The thermal performance has been evaluated in terms of overall heat transfer coefficients and Fanning friction factors. On average, the investigated corrugated tubes show an increase in the overall heat transfer coefficient of about 6 to 40% compared with the smooth tube. The increase in heat transfer is appreciably smaller than the increase in Fanning friction factor, which on average increases about 40 to 360%.
机译：在管壳式热交换器中，通常使用某种形式的内管表面粗糙度来降低边界层的热阻。这导致增加的热传递并且因此导致具有改善的热性能的热交换器。然而，粗糙度也增加了压降，结果导致相应的成本增加。一种公认的产生表面粗糙度的方法是使管子成螺旋形波纹。在这项研究中，对五个螺旋波纹管进行了研究，并将其与光滑管进行了比较。实验是在湍流区域中的水进行的，管侧的雷诺数范围约为13,000至72,000。已根据总传热系数和范宁摩擦系数评估了热性能。平均而言，所研究的波纹管与光滑管相比，总传热系数增加了约6％至40％。传热的增加明显小于范宁摩擦系数的增加，后者平均增加约40％至360％。

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