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首页> 外文会议>WSEAS International Conference on Fluid Mechanics >Numerical Investigation of Heat Transfer Enhancement and Pressure Drop in Heat Exchanger Tube fitted with Dual Twisted Tape Elements
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Numerical Investigation of Heat Transfer Enhancement and Pressure Drop in Heat Exchanger Tube fitted with Dual Twisted Tape Elements

机译：具有双绞带元件的热交换器管中传热增强和压降的数值研究

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摘要

This study presents a numerical investigation on heat transfer and fluid flow characteristics of a tube fitted with dual twisted tape elements in turbulent flow regime. The commercial software, FLUENT 13, is chosen as the CFD tool for this work. The numerical analyses are performed with three different diameter ratios defined as the ratio of twisted tape diameter to the inside diameter of the tube (d/D=0.2, 0.3, and 0.4) at a constant twist ratio (TR) of 5. Uniform heat flux is applied to the external surface of the tube and Reynolds numbers varied from 3920 to 28268 in the numerical calculations. The numerical results obtained from a plain tube are compared with those from the studies in literature for validation of numerical technique. The use of twisted tape elements leads to a considerable increase in heat transfer and pressure drop over the plain tube. The highest overall enhancement efficiency of 27% is achieved for the case d/D = 0.2 at a Reynolds number of 3920. Consequently, the numerical results reveal that the best operating regime of all twisted tape elements was found at low Reynolds number, leading to more compact heat exchanger.
机译：这项研究提出对传热和管的流体流动特性的数值研究装有在湍流状态双扭带元件。商业软件，FLUENT 13，被选为CFD工具对这项工作。数值分析与在5均匀的热的不变的扭转比率（TR）定义为扭转的磁带直径与管的内部直径的比值三个不同的直径比（d / d = 0.2，0.3和0.4）中进行焊剂被施加到管的外表面和雷诺数从3920在数值计算变化至28268。从一个普通的管获得的数值计算结果与那些从文献中研究用于数字技术的验证比较。使用扭曲的带元件导致普通管的传热和压力下降相当大的增加。的27％的最高整体提高效率的情况下实现的d / d = 0.2在3920的雷诺数。因此，计算结果表明，所有扭转的磁带元件的最好的操作状态在低雷诺数发现，导致更紧凑式换热器。

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