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首页> 外文期刊>International Journal of Heat and Mass Transfer >Axisymmetric numerical investigation of the heat transfer enhancement from a heated plate to an impinging turbulent axial jet via small vortex generators
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Axisymmetric numerical investigation of the heat transfer enhancement from a heated plate to an impinging turbulent axial jet via small vortex generators

机译：通过小型涡流发生器对从加热板到冲击湍流轴向射流的传热增强的轴对称数值研究

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摘要

The consequences of installing one or two vortex generators on a flat plate under axisymmetric conditions are presented in this work in order to analyse if heat transfer from the plate can be enhanced. Two different configurations have been considered to optimise the radial location of the vortex generators which can improve the heat transfer in comparison with a flat plate without them. To that end, we have conducted several numerical simulations of a turbulent jet impinging against a plate with one or two small tabs and the heat transfer from the plate quantified in terms of the Nusselt number. A jet Reynolds number of 23,000 and a nozzle-to-plate distance of 2 nozzle diameters were used throughout the study. Thanks to a parametric study, with the tab positions as parameters, we obtain different response surfaces which will help us to identify the optimal tab configurations. After that optimization process, we shall show that, for certain radial locations of the tabs, the averaged heat transfer on the tabbed plate can be improved up to around 4.5% with just a 2% of more pumping power due to pressure losses on the tabs. Furthermore, it is even more remarkable the fact that the averaged heat transfer can even be enhanced with around 25% of less pumping power requirements than when the plate is completely flat. We shall show that this effect is due to the fact that the tabs reduce the friction losses on the tabbed plate and, consequently, the pumping power needs. On the contrary, the heat transfer at the stagnation point cannot be ever increased.
机译：在这项工作中介绍了在轴对称条件下在平板上安装一台或两台涡流发生器的后果，以便分析是否可以增强从平板传热。已经考虑了两种不同的构造来优化涡流发生器的径向位置，与没有它们的平板相比，这可以改善传热。为此，我们对湍流射流撞击有一个或两个小凸耳的平板进行了数个数值模拟，并根据努塞尔特数对平板的传热进行了量化。在整个研究过程中，使用的雷诺数为23,000，喷嘴到板的距离为2喷嘴直径。由于进行了参数研究，以制表符位置作为参数，我们获得了不同的响应面，这将有助于我们确定最佳的制表符配置。经过优化过程后，我们将表明，对于凸片的某些径向位置，由于凸片上的压力损失，在凸片板上的平均热传递可以提高到大约4.5％，而抽水功率仅增加2％。 。此外，更为显着的事实是，与板完全平整时相比，平均热传递甚至可以以少25％的泵送功率要求来增强。我们将表明，这种效果是由于突舌减少了突舌板上的摩擦损失，从而降低了泵送功率的需求。相反，停滞点处的热传递永远不会增加。

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