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Convective thermal fluxes in unsteady nonhomogeneous flows

机译:不稳定的非均匀流动中的对流热通量

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摘要

In this paper we describe a novel experimental apparatus consisting of a thermoelectric driven heating and cooling device that could be used in didactic laboratories and research. Is possible to model common environmental flows by means of convective cooling and/or heating. We describe here a four cell device, in a 3D enclosure, but furthermore, it is possible to generate a convective flow of complex profiles using an array of thermoelectric devices (Peltier/Seebeck cells) controlled by a thermal proportional-integral-derivative controller generating a multisource buoyant flux. When convective heating and cooling takes place the combination of internal waves and buoyant turbulence is much more complicated if the Rayleigh and Reynolds numbers are high in order to study entrainment and mixing. The experiments made by our thermoelectric driven device could be used to analyze complex mixing, in either low or high Prandtl numbers, using scalar or heat transport in different liquids. From the varied experiments carried out with our device, we can compute and visualize the fields of velocity, vorticity, density and their gradients, here just a few configurations and the corresponding flows will be shown.
机译:在本文中,我们描述了一种新的实验装置,其由热电驱动加热和冷却装置组成,可用于教学实验室和研究。可以通过对流冷却和/或加热来模拟常见的环境流。我们在这里描述了一种四个单元设备,在3D外壳中,但此外,可以使用由热比例积分 - 衍生控制器产生的热电装置(Peltier / Seebeck单元)阵列产生复杂曲线的对流流程多源浮力通量。当对流加热和冷却发生内部波和浮力湍流的组合,如果瑞利和雷诺数数量高,以便研究夹带和混合,则更加复杂。通过我们的热电驱动装置制成的实验可用于分析在不同液体中的标量或热传输的低或高prandtl号中的复​​杂混合。从使用我们的设备进行的各种实验中,我们可以计算和可视化速度,涡旋,密度和梯度的领域,这里只需示出一些配置和相应的流量。

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