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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer and flow characteristics in a rectangular channel with combined delta winglet inserts
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Heat transfer and flow characteristics in a rectangular channel with combined delta winglet inserts

机译：结合三角形小翼插件的矩形通道中的传热和流动特性

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Flow and heat transfer characteristics in a rectangular channel with combined delta winglet vortex generators are studied using numerical simulations and experiments. This is undertaken for Reynolds numbers ranging between 500 and 1500 based on channel characteristics. The effects of four cases of different arrangements of delta winglets, their spacing between a delta winglet and the centre of the combined delta winglet, and rotation angles of the combined delta winglet for Case 1, on heat transfer and flow performance are numerically investigated. Experimental test of similar configurations for Case 1 highlights a good agreement with numerical results, indicating the simulations to be a good representation of the heat transfer and fluid flow. The numerical study shows that there is a general increase in the Nusselt number of the system with the inclusion of the combined winglet. The maximum Nusselt number of the channel is enhanced by 92%, however the friction factor is increased by 178% compared to that of a smooth rectangular channel. Both of the Nusselt number and friction factor first decrease and then increase with the rotation angle. The Nusselt number and friction factor are also observed to decrease with spacing between a winglet and the centre of the combined winglet as the number of the vortices is reduced leading to the disturbance of the combined winglet on fluid weakening. The best observed heat transfer performance is obtained when the spacing is equal to zero with a rotation angle of 60 degrees. This work indicates that the longitudinal vortices play a significant role leading to the enhancement of heat transfer in consequence of the addition of winglet configurations, however optimization of the winglet configuration is needed to achieve maximum performance. Crown Copyright (C) 2019 Published by Elsevier Ltd. All rights reserved.
机译：利用数值模拟和实验研究了结合三角翼小涡流发生器的矩形通道内的流动和传热特性。根据通道特性，雷诺数在500到1500之间。数值研究了案例1中4种不同的三角翼小翼布置，三角翼小翼与组合三角翼小翼的中心之间的间距以及三角翼组合翼的旋转角度对传热和流动性能的影响。案例1的类似配置的实验测试突出显示了与数值结果的良好一致性，表明模拟可以很好地表示热传递和流体流动。数值研究表明，随着组合小翼的加入，系统的Nusselt数普遍增加。通道的最大Nusselt数增加了92％，但是与平滑矩形通道相比，摩擦系数增加了178％。努塞尔数和摩擦系数都随旋转角度而先减小然后增大。随着涡旋数的减少，还观察到努塞尔数和摩擦因数随着小翼和组合小翼的中心之间的间隔的减小而减小，从而导致组合小翼对流体减弱的干扰。当间距等于零且旋转角度为60度时，可以获得最佳的观察到的传热性能。这项工作表明，由于增加了小翼构型，纵向涡流在导致传热增强方面起着重要作用，但是需要对小翼构型进行优化以实现最佳性能。 Crown版权所有（C）2019，由Elsevier Ltd.出版。保留所有权利。

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