表面光洁度
雷诺数
表面粗糙度
粗糙度长度
流动阻力
水力粗糙度
水力阻力
数学
平方(代数)
几何学
对数
材料科学
复合材料
流量(数学)
光学
机械
数学分析
热力学
物理
湍流
风廓线幂律
涡轮机
作者
Donald W. Knight,J. Alasdair Macdonald
出处
期刊:Journal of the Hydraulics Division
[American Society of Civil Engineers]
日期:1979-06-01
卷期号:105 (6): 675-690
被引量:73
标识
DOI:10.1061/jyceaj.0005224
摘要
An experimental study of two-dimensional flow over non-uniform roughness is reported in which artificial strip roughness was employed. The roughness elements were square in cross section and placed at different relative spacings. A six-fold classification system is suggested based upon the ideas of Morris and Adachi. Resistance data from other investigators is also considered, and the variation of resistance coefficient with Reynolds number, relative spacing, and relative depth examined. The general resistance parameter, X, first introduced by Sayre and Albertson is found to be particularly helpful in synthesizing the various sets of resistance data. Logarithmic resistance equations involving X are validated over a wide range of roughness wavelength to height ratio. The relationship between roughness height and Nikuradse's equivalent sand roughness size is also examined.
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