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首页> 外文期刊>International Journal of Heat and Mass Transfer >3D Numerical Study of Conical and Fusiform Turbulators for Heat Transfer Improvement in a Double-Pipe Heat Exchanger
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3D Numerical Study of Conical and Fusiform Turbulators for Heat Transfer Improvement in a Double-Pipe Heat Exchanger

机译：双管热交换器传热改进锥形和纺锤形湍流器的3D数值研究

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摘要

This study demonstrated the effect of conical and fusiform turbulators placed in double-pipe heat exchanger (DPHE) on the heat transportation and turbulent flow designs. A total of 21 configurations including conical and fusiform turbulator inserts are simulated in a double-pipe heat exchanger with circular and rectangular tube configurations at four Reynolds number levels (Re = 4000, 7000, 10000, and 13000) on the tube side. Utilizing Fluent software, the finite-volume scheme is implemented to discretize the turbulence flow equations using the realizable k-ε model. The results demonstrate that the maximum convective heat transfer coefficient is achieved when using a heat exchanger having a circular inner pipe. Further, the performance index of the heat exchanger (HE) is found to increase by modifying the shape of conical turbulators to fusiform. The DPHE with circular inner pipes and 12 mm fusiform turbulators is found to be the optimal configuration in-terms of thermal performance. At Re = 4000, the configuration with fusiform 9 mm inserts and a rectangular inner pipe with a 0.72 aspect ratio offered the highest coefficient of performance (approximately 27.74) with the overall heat transfer coefficient increased by 4.58% compared to the plain rectangular tube and by 4.68% compared to the circular tube without turbulators.
机译：本研究表明，锥形和纺锤形湍流器在热传输和湍流设计中放置在双管热交换器（DPHE）中的效果。总共21个配置包括锥形和轴承型湍流件插入件，在管侧的四个雷诺数水平（Re = 4000,7000,10000和13000）中，在双管热交换器中模拟在双管热交换器中。利用流畅的软件，实现了有限卷方案以使用可实现的K-ε模型离散湍流流程方程。结果表明，当使用具有圆形内管的热交换器时，实现了最大的对流传热系数。此外，通过将锥形湍流器的形状改变为Fusiform来发现热交换器（HE）的性能指数增加。发现具有圆形内管和12mm Fusiform湍流器的DPHE是热性能的最佳配置。在RE = 4000，用丝状9mm插入物和具有0.72纵横比的矩形内管的配置提供了最高的性能系数（约27.74），总传热系数与普通矩形管相比增加了4.58％，并通过4.68％与无湍流器的圆形管相比。

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