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PIV measurement and simulation of turbulent thermal free convection over a small heat source in a large enclosed cavity

机译：大封闭腔体中小热源上湍流热自由对流的PIV测量和模拟

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摘要

To investigate the mechanism of natural convection in an enclosed cavity with a small horizontal heated plate (200 x 300 mm(2)) in the middle of the bottom and a cool plate at the top, an enclosed cavity (1960 x 980 x 800 mm(3)) is established. The working fluid is air at atmospheric pressure, and the Rayleigh number is of the order of 10(9). Temperature measurements were obtained on the centerline over the plate using thermocouples (d = 0.1 mm), and velocity fields of the central plane over the plate were measured with Ply. Through utilizing some techniques, including the background-elimination technique and overlapping-joint technique in the experiment, accurate experiment data have been established. Three turbulence models are adopted and compared to the experimental data. The result shows that the numerical result of the RNG k-epsilon model best fits the experiment data at the centerline of the cavity. Analysis of simulation results enabled us to understand that the period of cycle swing is about 60s. Detailed information was obtained by illustrating the iso-surfaces and elucidating how streamlines associate with those surfaces. Because of the border effect of a small heat source, the streamlines moved to the center of the cavity from four main border directions, rose to the top, and then spread to four corners and moved downward, finally forming a complete cycle. Ultimately, the analysis of buoyancy and inertia force helps us to achieve a better understanding of the nature of flow. (C) 2015 Elsevier Ltd. All rights reserved.
机译：要研究封闭腔中的自然对流机理，在封闭腔的底部中间有一个小的水平加热板（200 x 300 mm（2）），在顶部有一个冷却板，一个封闭腔（1960 x 980 x 800 mm （3））成立。工作流体是大气压下的空气，瑞利数约为10（9）。使用热电偶（d = 0.1 mm）在板上的中心线上获得温度测量值，并使用Ply测量板上的中心平面的速度场。通过在实验中利用背景消除技术和交叠技术，建立了准确的实验数据。采用了三种湍流模型并将其与实验数据进行比较。结果表明，RNGk-ε模型的数值结果最适合腔体中心线处的实验数据。对仿真结果的分析使我们能够理解，周期摆动的周期约为60s。通过说明等值面并阐明流线与这些表面的关联方式获得了详细的信息。由于小的热源的边界效应，流线从四个主要边界方向移到腔体的中心，上升到顶部，然后扩展到四个角并向下移动，最终形成完整的循环。最终，对浮力和惯性力的分析有助于我们更好地了解流动的本质。 （C）2015 Elsevier Ltd.保留所有权利。

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