网站首页  情感咨询  情感美文  情感百科  情感生活  学习充电  旧版美文

请输入您要查询的词汇：

　

词汇 Darcy Friction factor
分类 英语词汇 英语翻译词典
释义

Darcy Friction factor

中文百科

达西–威斯巴哈方程序 Darcy–Weisbach equation

（重定向自Darcy 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Darcy 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.
随便看

　

依恋情感网英汉例句词典收录3870147条英语例句词条，基本涵盖了全部常用英语单词的释义及例句，是英语学习的有利工具。

　

Copyright © 2004-2024 Yiyi18.com All Rights Reserved
京ICP备2021023879号 更新时间：2025/8/5 6:24:39