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首页> 外文期刊>Heat Transfer Engineering >Experimental and Numerical Investigation on a Water-Filled Cavity Natural Convection to Find the Proper Thermal Boundary Conditions for Simulations
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Experimental and Numerical Investigation on a Water-Filled Cavity Natural Convection to Find the Proper Thermal Boundary Conditions for Simulations

机译：充水腔自然对流寻找合适热边界条件的实验和数值研究

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摘要

In this study, the laminar natural convection flow inside a water-filled cavity with differentially heated vertical walls is investigated experimentally and numerically. Both of the walls are heated and cooled by two special heat exchangers that are attached to the walls and the rest are insulated. The main purpose of each test is to reach a uniform constant temperature on both of the heated and cooled walls. Early tests for an air-filled cavity showed that a uniform temperature on the walls is feasible, while a different trend was observed for a water-filled cavity with a nonuniform distribution of temperature. ANSYS FLUENT 15 employed four approaches in terms of boundary conditions for computational purposes. None of the three-dimensional (3D) and two-dimensional (2D) models of the cavity with a uniform wall temperature (the wall average temperature from the experiment) were suitable for predicting the Nusselt number. Therefore, it was essential to use the full model to properly predict the real distribution of temperature and Nusselt number on the walls. The 3D model of the cavity with a nonuniform wall temperature, which was borrowed from the experiment, also provided good results for the Nusselt number, but a measured temperature was still needed from the experiments. The 2D simulation's findings showed a weakness in properly capturing the streamlines for all ranges of Rayleigh numbers.
机译：在这项研究中，实验和数值研究了带有垂直加热壁的充水腔内部的层流自然对流。两个壁都通过连接到壁上的两个特殊的热交换器进行加热和冷却，其余的则被绝缘。每个测试的主要目的是在加热和冷却的壁上均达到均匀的恒定温度。对充气腔的早期测试表明，在壁上均匀加热是可行的，而对于温度分布不均匀的充水腔则观察到了不同的趋势。 ANSYS FLUENT 15在边界条件方面采用了四种方法进行计算。具有均匀壁温（实验中的壁平均温度）的空腔的三维（3D）和二维（2D）模型均不适用于预测Nusselt数。因此，必须使用完整的模型来正确预测墙壁上温度和Nusselt数的实际分布。从实验中借用了壁温不均匀的腔体3D模型，也为Nusselt数提供了很好的结果，但是实验中仍然需要测量温度。 2D模拟的结果表明，在正确捕获所有瑞利数范围的流线时，存在一个缺陷。

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  • 来源
    《Heat Transfer Engineering》 |2018年第4期|359-373|共15页
  • 作者

    Mostafa Mahdavi; Mohsen Sharifpur; Hadi Ghodsinezhad; Josua P. Meyer;

  • 作者单位

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa;

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa;

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa;

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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