Prony equation
From Infogalactic: the planetary knowledge core
The Prony equation (named after Gaspard de Prony) is a historically important equation in hydraulics, used to calculate the head loss due to friction within a given run of pipe. It is an empirical equation developed by Frenchman Gaspard de Prony in the 19th century:
where hf is the head loss due to friction, calculated from: the ratio of the length to diameter of the pipe L/D, the velocity of the flow V, and two empirical factors a and b to account for friction.
This equation has been supplanted in modern hydraulics by the Darcy–Weisbach equation, which used it as a starting point.
References
- Lua error in package.lua at line 80: module 'strict' not found.. The Prony equation and its replacement by the Darcy–Weisbach equation are on pp. 11–12.
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