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首页> 外文期刊>International Journal of Heat and Mass Transfer >Vortex dynamics and heat transfer of longitudinal vortex generators in a rectangular channel
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Vortex dynamics and heat transfer of longitudinal vortex generators in a rectangular channel

机译：矩形通道中纵向涡流发生器的涡流动力学和传热

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This paper reports a numerical investigation of fluid flow and heat transfer in a rectangular channel with delta-shaped winglet longitudinal vortex generators (LVGs) under different configurations. In addition to the conventional common-flow-down configuration and the common-flow-up configuration, a unique mixed configuration is suggested. The "method of images" is successfully adopted to analyze the dynamics of the longitudinal vortices due to wall interference. The Nusselt number, friction factor and overall performance coefficient for the three configurations are compared at various Reynolds numbers (all less than 2200), LVG row numbers, channel heights, and LVG aspect ratios. It is found that the channel height and LVG aspect ratio are the two most critical factors influencing the effectiveness of the different LVG configurations, which may explain why inconsistent conclusions have been presented by previous studies comparing the performance of the common-flow-down and common-flow-up configurations. When the channel height is relatively small, the unique mixed configuration is found to be the most effective at enhancing fluid mixing (and therefore improving heat transfer) at streamwise cross sections. When the LVG aspect ratio becomes large, the common-flow-down configuration outperforms the common flow-up configuration. This paper sheds some insight on how to design the optimal LVG configuration for enhancing heat transfer performance. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文报道了在三角洲小翼纵向涡流发生器（LVG）在不同的配置下的矩形通道中的流体流动和传热的数值研究。除了常规的通用流向下配置和通用流向上配置之外，还建议了一种独特的混合配置。成功地采用“图像方法”来分析由于壁干扰引起的纵向涡旋的动力学。在各种雷诺数（均小于2200），LVG行数，通道高度和LVG长宽比下，比较了三种配置的Nusselt数，摩擦系数和整体性能系数。发现通道高度和LVG纵横比是影响不同LVG配置有效性的两个最关键因素，这可以解释为什么以前的研究比较了普通流和普通流的性能时得出了不一致的结论。 -向上配置。当通道高度相对较小时，发现独特的混合构造在增强沿流向横截面的流体混合（从而改善热传递）方面最有效。当LVG宽高比变大时，通用向下流动的配置胜过通用向上流动的配置。本文对如何设计最佳LVG配置以增强传热性能提供了一些见识。 （C）2018 Elsevier Ltd.保留所有权利。

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