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A Historical Misperception on Calculating the Average Convection Coefficient in Tubes With Constant Wall Heat Flux

机译:关于计算恒定壁热通量的平均对流系数的历史误解

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摘要

The historical approach to averaging the convection coefficient in tubes of constant wall heat flux leads to quantitative errors in short tubes as high as 12.5% for convection into fully developed flows and 33.3% for convection into hydrodynamically developing flows. This mistake can be found in teaching texts and monographs on heat transfer, as well as in major handbooks. Using the correctly defined relationship between local and average convection coefficients, eight new correlations are presented for fully developed and developing flows in round tubes and between parallel plates for the constant wall heat flux condition. These new correlations are within 2% of exact solutions for fully developed flows and within 6% of first principle calculations for hydrodynamically developing flows.
机译:对恒定壁热通量的管子中的对流系数求平均值的历史方法导致短管中对流到完全展开的流中的定量误差高达12.5%,而对流到水力发展流中的对流高达33.3%。这个错误可以在传热的教科书和专着以及主要手册中找到。使用正确定义的局部对流系数和平均对流系数之间的关系,对于恒定的壁热通量条件,提出了八个新的相关性,用于圆管中以及平行板之间完全展开和展开的流动。这些新的相关性在完全开发的流量的精确解的2%之内,在流体动力学开发的流量的第一原理计算的6%之内。

著录项

  • 来源
    《Journal of Heat Transfer》 |2019年第6期|061702.1-061702.9|共9页
  • 作者

    Bennett Ted D.;

  • 作者单位

    Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93117 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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