Limitations and proper use of the Hazen-Williams equation
Limitations and proper use of the Hazen-Williams equation
复制标题
Hazen-Williams 方程的局限性和正确使用
DOI：
10.1061/(asce)0733-9429(1998)124:9(951
复制
发表时间：
1998
影响因子：
2.4
通讯作者：
C. P. Liou
中科院分区：
文献类型：
--
作者：
C. P. Liou
Hazen-Williams方程在给水与卫生工程中应用广泛。该方程使用常数Hazen-Williams C来表示管道内部的粗糙度。由于该公式的经验性质，其适用范围有限。许多教科书和软件手册根据管道类型、条件和使用年限给出C值，但没有给出适用范围。历史的实验数据被用来证明，C是一个强大的功能的雷诺数和管道尺寸和Hazen-Williams方程具有狭窄的适用范围的雷诺数和管道尺寸。当Hazen-Williams方程在其数据范围之外使用时，误差水平是显著的。然而，在特定雷诺数下给定管道的有效C可用于估计管道的相对粗糙度，然后可由有理Darcy-Weisbach方程使用，而不受范围限制。给出了一种实现该功能的方法。
The Hazen-Williams equation is used widely in water supply and sanitary engineering. This equation uses a constant, the Hazen-Williams C, to indicate the roughness of a pipe interior. Because of the empirical nature of the equation, its range of applicability is limited. Many textbooks and software manuals give C values based on pipe type, condition, and age but do not give the range of applicability. Historic experimental data is used to demonstrate that C is a strong function of Reynolds number and pipe size and that the Hazen-Williams equation has narrow applicable ranges for Reynolds numbers and pipe sizes. The level of error when the Hazen-Williams equation is used outside its data ranges is significant. However, a valid C for a given pipe at a specific Reynolds number can be used to estimate a pipe's relative roughness, which then can be used by the rational Darcy-Weisbach equation without the range limitations. A method for doing so is given.