Evaluation of fully developed turbulent friction coefficient in polygonal section ducts and ducts with corner angle 0° by new characteristic lengths

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-11-06 DOI:10.1016/j.nucengdes.2024.113663

Son Nam-Jin, Kim RyongIl, Kim Hyo-Song, Yun Kumchol, O. Ju-Sung

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Abstract

In estimating the friction coefficient of fully developed turbulent flow in a circular duct, the Blasius equation is often used. The hydraulic diameter is the characteristic length of the Re number used when mapping the non-circular duct section to the circular pipe section. We have newly defined the characteristic length of the Re number of the Blasius equation. The newly proposed characteristic length is wetted perimeter equivalent round diameter and the modified hydraulic diameter with minimum change of area and perimeter. Based on the new diameters, a method to estimate the turbulent friction coefficient of a fully developed isosceles.

triangular duct, regular polygon duct, and a duct with an edge angle of 0° is proposed and its accuracy is evaluated. The new characteristic lengths we propose are easy to calculate, provided that certain accuracy is achieved. Therefore, it is easily applicable to the estimation of friction coefficient of isosceles triangular ducts, regular polygonal ducts and corner angle 0° section ducts.

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用新的特征长度评估多边形截面风道和转角角为 0°的风道中完全展开的湍流摩擦系数

在估算圆形管道中充分发展的湍流的摩擦系数时，通常使用布拉修斯方程。水力直径是将非圆形管道截面映射到圆形管道截面时使用的 Re 值的特征长度。我们重新定义了布拉修斯方程的 Re 值特征长度。新提出的特征长度是润湿周长等效圆直径以及面积和周长变化最小的修正水力直径。根据新直径，提出了一种估算完全展开的等腰三角形风管、规则多边形风管和边缘角为 0° 的风管的湍流摩擦系数的方法，并对其精度进行了评估。在达到一定精度的前提下，我们提出的新特征长度易于计算。因此，它很容易应用于等腰三角形风管、正多边形风管和边角为 0°截面风管的摩擦系数估算。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.