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Correlations for Natural Convective Heat Transfer From Vertical and Inclined Cylinders

机译：垂直和倾斜圆柱体自然对流传热的相关性

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摘要

Natural convective heat transfer from the exposed top surface of an inclined isothermal cylinder, with a circular cross section, mounted on a flat adiabatic base plate, has been numerically investigated. The cylinder is mounted normal to the flat adiabatic base plate. The numerical solution has been obtained by solving the dimensionless governing equations, subject to boundary conditions, using the commercial finite-volume method-based code FLUENT. The flow has been assumed to be symmetrical about the vertical center-plane through the cylinder. Results have only been obtained for Prandtl number of 0.7, which is the value existing in the application that originally motivated this study. The simulations consider Rayleigh numbers between 10~3 and 10~7, inclination angles between 0° and 180°, and dimensionless cylinder diameters between 0.25 and 1. The effects of dimensionless diameter, Rayleigh numbers, and inclination angles on the mean Nusselt number for the top exposed surface of the cylinder have been studied. Empirical correlations for the heat transfer rates from the top exposed surface of the cylinder have been derived.
机译：已经对安装在平坦绝热基板上，具有圆形横截面的倾斜等温圆柱体的暴露顶部表面的自然对流传热进行了数值研究。圆柱体垂直于绝热底板安装。通过使用基于商业有限体积方法的代码FLUENT，在边界条件下求解无量纲的控制方程，从而获得了数值解。假定流动相对于通过气缸的垂直中心平面对称。仅当Prandtl值为0.7时才获得结果，这是最初激发该研究的应用程序中存在的值。模拟考虑了10〜3至10〜7之间的瑞利数，0°至180°之间的倾角以及0.25至1之间的无量纲圆柱体直径。无量纲直径，瑞利数和倾斜角对平均Nusselt数的影响已经研究了圆柱体的顶部暴露表面。已经得出了从圆柱体顶部暴露表面传热速率的经验相关性。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|75-86|共12页
  • 作者

    Abdulrahim Kalendar; Sayed Karar; Ahmad Kalendar; Patrick Oosthuizen;

  • 作者单位

    Department of Mechanical Power and Refrigeration, College of Technological Studies-PAAET, Shuwaikh, Kuwait;

    Department of Mechanical Power and Refrigeration, College of Technological Studies-PAAET, Shuwaikh, Kuwait;

    Department of Mechanical Power and Refrigeration, College of Technological Studies-PAAET, Shuwaikh, Kuwait;

    Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario, Canada;

  • 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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