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首页> 外文期刊>International Journal of Heat and Mass Transfer >New friction factor equations developed for turbulent flows in rough helical tubes
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New friction factor equations developed for turbulent flows in rough helical tubes

机译：为粗糙螺旋管中的湍流开发了新的摩擦系数方程

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摘要

Helical tubes are widely used and there lacks friction factor equations for turbulent flows in rough helical tubes. Turbulent flows in rough helical tubes were investigated theoretically in this paper. Friction factor equations for transitionally and fully rough regime turbulent flows in rough helical tubes were derived based on the logarithmic velocity distribution law. The parameters of the equations were obtained by regression analysis of experimental data of Clancy (1949) and verified by experimental data of McElligott (1948). The characteristics of the friction factors in rough helical tubes were discussed based on the equations. Friction factors of helical tubes are influenced by Reynolds numbers, relative roughnesses and curvature ratios. The friction factors of rough helical tubes can also be divided into a transitionally rough regime and a fully rough regime according to the roughness height and the Reynolds number like that for straight tubes. Roughnesses have greater effects on the transition from the transitionally rough regime to the fully rough regime than that of curvature ratios. Roughness effects on friction factors increase with the increasing of the curvature ratio and the Reynolds number.
机译：螺旋管被广泛使用，并且缺乏用于粗糙螺旋管中湍流的摩擦系数方程。本文从理论上研究了粗糙螺旋管中的湍流。基于对数速度分布定律，推导了在粗糙螺旋管中过渡态和完全粗糙态湍流的摩擦因子方程。通过对Clancy（1949）的实验数据进行回归分析获得方程式的参数，并通过McElligott（1948）的实验数据进行验证。基于这些方程，讨论了粗糙螺旋管中摩擦系数的特性。螺旋管的摩擦系数受雷诺数，相对粗糙度和曲率比的影响。像直管一样，根据粗糙高度和雷诺数，粗糙螺旋管的摩擦系数也可以分为过渡粗糙状态和完全粗糙状态。粗糙度对从过渡粗糙状态到完全粗糙状态的过渡的影响大于曲率比。粗糙度对摩擦系数的影响随着曲率比和雷诺数的增加而增加。

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  • 作者

    Houjian Zhao; Xiaowei Li; Xinxin Wu;

  • 作者单位

    Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

    Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

    Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

  • 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

    Helical tube; Curvature ratio; Friction factor; Relative roughness; Turbulent flow;

    机译：螺旋管曲率比摩擦系数;相对粗糙度湍流;

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