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Free Convection Heat Transfer from Vertical Slender Cylinders: A Review

机译:垂直细长气缸的自由对流传热:综述

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摘要

The effect of transversal curvature of a vertical cylinder becomes important where the thermal boundary layer thickness is comparable or thicker then the radius of cylinder. The cylinder slenderness criterion for laminar free convection for fluids of Prandtl numbers from 0.01 to 100 is presented. The classical analysis of the laminar free convection heat transfer from vertical cylinders is shown. Some results of numerical calculations of the turbulent boundary layer on a vertical cylinder using modified integral method are given. Experimental data concerning the laminar-turbulent transition suggest that the critical Grashof number for a vertical flat plate is Gr_(cr) ≈ 10~9 and for a vertical cylinder is Gr_(cr) ≈ 4 × 10~9. Theoretical, numerical, and experimental data for free convection heat transfer from vertical slender circular cylinders are surveyed. A separate section of the paper is devoted to the presentation of the list of selected correlation equations. Some of them are compared graphically. In the laminar region, the correlation equation based on the numerical calculations is validated with the recent experimental results for Prandtl number of 0.71 and for the cylinder height to diameter ratio from 1 to 60. In the turbulent region, few experimental data are available, and some results indicate that the effect of transversal curvature on the average convective heat transfer is very weak.
机译:当热边界层厚度等于或大于圆柱体的半径时,垂直圆柱体的横向曲率的影响就变得很重要。提出了Prandtl数为0.01到100的流体的层流自由对流的圆柱细长准则。显示了对垂直圆柱体的层流自由对流传热的经典分析。给出了利用改进的积分方法对垂直圆柱上的湍流边界层进行数值计算的一些结果。关于层流湍流的实验数据表明,垂直平板的临界Grashof数为Gr_(cr)≈10〜9,而垂直圆柱的临界Grashof数为Gr_(cr)≈4×10〜9。考察了垂直细长圆柱体自由对流传热的理论,数值和实验数据。本文的另一部分专门介绍所选相关方程的列表。其中一些以图形方式进行了比较。在层流区域中,基于数值计算的相关方程已得到最近的实验结果验证,Prandtl值为0.71,圆柱高度与直径的比为1至60。在湍流区域,很少有实验数据可用,并且一些结果表明,横向曲率对平均对流换热的影响很弱。

著录项

  • 来源
    《Heat Transfer Engineering》 |2008年第6期|521-536|共16页
  • 作者

    CZESLAW O. POPIEL;

  • 作者单位
  • 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
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:19:45

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