- References
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
- {{citation|contribution=Henry Darcy (1803–1858): Immortalised by his scientific legacy|first=Craig|last=Simmons|pages=3–24|title=Aquifer Systems Management: Darcy’s Legacy in a World of Impending Water Shortage: Selected Papers from the International Association of Hydrogeologists (IAH) Dijon Symposium, Dijon, France, 30 May–1 June 2006|editor-first=Laurence|editor-last=Chery|publisher=Taylor & Francis / Balkema|location=Leiden, The Netherlands|year=2007|isbn=9780415443555}}. The Prony equation and its replacement by the Darcy–Weisbach equation are on pp. 11–12.
1 : Equations of fluid dynamics
- Rho Aquarii
- Rho Aquilae
- Rho Arietis
- Rho Aurigae
- RhoB
- RHOB
- Rhobell Fawr
- Rho Bootis
- Rho Boötis
- Rhobuck
- Rhoca-Gil
- Rho Calculus
- Rho calculus
- Rho Capricorni
- Rho Centauri
- Rho Coronae Borealis b
- Rhoda B. Billings
- Rhoda Billings
- Rhoda Bryan Billings
- Rhoda Bubendey Métraux
- Rhoda Bulter
- Rhoda Butler
- Rhoda (Cairo)
- Rhodacanthis
- Rhodacanthis flaviceps