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首页> 外文期刊>International Journal of Heat and Mass Transfer >Comparison of winglet-type vortex generators periodically deployed in a plate-fin heat exchanger - A synergy based analysis
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Comparison of winglet-type vortex generators periodically deployed in a plate-fin heat exchanger - A synergy based analysis

机译：定期在板翅式换热器中部署的小翼型涡流发生器的比较-基于协同作用的分析

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摘要

The objective of the present investigation is to assess the performance of a plate-fin heat exchanger with an emphasis on acquiring fundamental understanding of the relation between local flow behavior and heat transfer augmentation mechanism. Numerical simulations are performed in a rectangular channel containing built-in longitudinal vortex generators on the bottom wall arranged periodically both in the streamwise and spanwise directions. Two types of vortex generators, namely, rectangular winglet pair (RWP) and delta-winglet pair (DWP) with two different flow arrangements, common-flow-up (CFU) and common-flow-down (CFD) have been explored to assess the influence of shape and flow arrangements on heat transfer enhancement. The basic mechanisms of flow structure and heat transfer characteristics have been examined with the help of secondary velocity vectors, streamlines, and temperature contours. Additionally, the mechanism of the local heat transfer augmentation has been explained using a novel concept called the field synergy principle. The performance of the vortex generators has been compared based on integral quantities such as Nusselt number, pressure loss, performance evaluation factor and domain averaged synergy angle. The computations reveal enhanced mixing of fluid between the wall layer and the core due to strong secondary flows produced by vortex generators. The performance analysis indicates that the RWP is more effective in terms of heat transfer enhancement as compared to DWP. The field synergy analysis has shown that the sites with higher Nusselt number are associated with smaller synergy angle or better coordination between the velocity vector and the temperature gradient.
机译：本研究的目的是评估板翅式热交换器的性能，重点是获得对局部流动行为与传热增强机制之间关系的基本了解。在矩形通道中进行数值模拟，该矩形通道在底壁上包含内置的纵向涡流发生器，该涡流发生器在流向和展向都定期排列。已经研究了两种类型的涡流发生器，即矩形小翼对（RWP）和三角翼小翼对（DWP），它们具有两种不同的流动布置，即共流（CFU）和共流（CFD）。形状和流动安排对强化传热的影响。借助次级速度矢量，流线和温度等高线，研究了流动结构和传热特性的基本机理。另外，已经使用称为场协同原理的新颖概念解释了局部传热增加的机理。涡流发生器的性能已根据诸如Nusselt数，压力损失，性能评估因子和域平均协同角之类的整数进行了比较。计算结果表明，由于涡流发生器产生的强大的二次流，壁层与芯层之间的流体混合得到了增强。性能分析表明，与DWP相比，RWP在传热增强方面更为有效。场协同分析表明，具有较高努塞尔特数的位点与较小的协同角或速度矢量和温度梯度之间的较好协调性相关。

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