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单词 Moody friction factor
释义

Moody friction factor

中文百科

达西–威斯巴哈方程序 Darcy–Weisbach equation

（重定向自Moody friction factor）

达西–威斯巴哈方程序是流体力学中的唯象方程序，得名自物理学家亨利·达西和尤利乌斯·威斯巴哈，此方程序描述固定长度管路内因摩擦力产生的扬程损失（或称为压强损失）和管路中的平均流速的关系。

达西–威斯巴哈方程序中包括一个无因次的摩擦因子，名为达西–威斯巴哈摩擦因子或达西摩擦因子，此摩擦因子是范宁摩擦因子的四倍。

英语百科

Darcy–Weisbach equation 达西–威斯巴哈方程式

（重定向自Moody friction factor）
The Darcy friction factor versus Reynolds Number for 10 < Re < 108 for smooth pipe and a range of values of relative roughness ε/D. Data are from Nikuradse (1932, 1933), Colebrook (1939), and McKeon (2004).
The Darcy friction factor versus Reynolds Number for 103 < Re < 108 for smooth pipe and a range of values of relative roughness ε/D. Data are from Nikuradse (1932, 1933), Colebrook (1939), and McKeon (2004).
A plot of resistance factor fD with the smooth pipe dependency factored out, versus Re √fD. The smooth pipe data lie on a horizontal line with ordinate = 1; the rough pipe data coincide with the smooth for low values of the abscissa, then branch away on parallel trajectories. Data with a given value of ε/D are from Nikuradse,[6][7] smooth pipe data from Princeton[8] are also included.
A plot of resistance factor fD with the smooth pipe dependency factored out, versus R*, the friction Reynolds number. The smooth pipe data correspond to R* = 0, so are out of frame. The rough pipe data fall on a single trajectory when plotted in this way. For a given roughness ratio, ε/D, and for R* large, the Darcy friction factor fD approaches a constant, independent of Re, the Reynolds number. Phenomenological functions attempting to fit these data, including the Colebrook–White relation are shown.

In fluid dynamics, the Darcy–Weisbach equation is a phenomenological equation, which relates the head loss, or pressure loss, due to friction along a given length of pipe to the average velocity of the fluid flow for an incompressible fluid. The equation is named after Henry Darcy and Julius Weisbach.
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更新时间：2025/6/23 23:49:13