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首页> 外文期刊>International Journal of Heat and Fluid Flow >A note on the flow and heat transfer enhancement in a channel with built-in winglet pair
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A note on the flow and heat transfer enhancement in a channel with built-in winglet pair

机译：关于内置小翼对的通道中流动和传热增强的注意事项

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摘要

Counter rotating longitudinal vortices produced by winglet in a channel are known to enhance heat transfer. In the present investigation the flow structure and heat-transfer enhancement by a winglet pair of non-zero thickness has been studied. A delta winglet pair type vortex generator is placed in a hydrodynamically developed and thermally developing laminar channel flow. Computations are done by solving the unsteady, three-dimensional, incompressible Navier-Strokes equations and energy equation using a modified Marker-and-Cell (MAC) method. The flow structure is complex and consists of main, corner and induced vortices. It is observed that as compared to a channel without winglets, the heat transfer is enhanced by 33% when single winglet is used and by 67% when a winglet pair is employed. Effects of thickness of the winglets and Reynolds number on the heat transfer augmentation are presented.
机译：由小翼在通道中产生的反向旋转的纵向涡流已知可增强热传递。在本研究中，已经研究了非零厚度的小翼对的流动结构和传热增强。三角翼小翼对型涡流发生器放置在流体动力学发展和热发展的层流通道中。通过使用改进的Marker-and-Cell（MAC）方法求解不稳定的三维不可压缩的Navier-Strokes方程和能量方程，可以完成计算。流动结构很复杂，由主旋涡，拐角和诱发涡旋组成。观察到，与没有小翼的通道相比，当使用单个小翼时，传热提高了33％，而当使用小翼对时，传热提高了67％。提出了小翼的厚度和雷诺数对传热增加的影响。

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