Henry Darcy
Henry Philibert Gaspard Darcy (born June 10, 1803 in Dijon , France , † January 3, 1858 in Paris ) was a French engineer who dealt with the flow of porous media and found a linear relationship for laminar flow , Darcy's law . It is of great importance for groundwater and seepage flows , but also applies to the seepage flows of other liquids such as petroleum in the soil.
Life
In 1821 Darcy entered the Polytechnic School, then in 1823 the famous École Nationale des Ponts et Chaussées . In 1828 he married the Englishwoman Henriette Carey.
Activity as an engineer
As a hydraulic engineer, he also dealt with the hydraulics of pipelines and with currents in gravity channels. He is said to have developed the Darcy-Weisbach equation together with Julius Weisbach in Freiberg , with which the pressure and energy losses in pipes due to friction are described. Apparently this formula was only mistakenly ascribed to Darcy; instead it is from Jean François d'Aubuisson de Voisin and Weisbach.
The Darcy unit is named after him.
From 1856 onwards, the pitot tube developed by Pitot was decisively further developed by Henry Darcy by installing valves, applying a vacuum over the tubes, moving the inlet of the static tube to the side - and thus outside the turbulence of the pitot tube - and a new calculation formula the flow rate developed. Darcy's further development was also primarily used to measure flowing water.
Honors
On August 31, 1842 he was made a Knight of the Legion of Honor . Place Darcy and Jardin Darcy were named after Henry Darcy in his hometown of Dijon . He is also named for the Henry Darcy Medal of the Hydrological Sciences Division of the European Geophysical Society , awarded since 1999, and the Darcy Lecture Series organized by the US National Ground Water Association since 1986 .
Fonts
- Les fontaines publiques de la ville de Dijon , Paris 1856
Web links
- Darcy in Famous Engineers ( Memento from May 28, 2010 on the Internet Archive )
- Ekkehard Holzbecher: The Darcy Law ( Memento from May 23, 2003 in the Internet Archive ) (from: Supplements to the modeling of dynamic processes in hydrology , Springer, 1996)
- Glenn Brown: Henry Darcy and His Law. Biosystems and Agricultural Engineering, Oklahoma State University, 2005 (English).
Individual evidence
- ^ Henry Darcy Medal. egu.eu, accessed on February 24, 2018 (English).
- ^ Darcy Lecture Series in Groundwater Science. (No longer available online.) About National Ground Water Association, archived from the original on February 24, 2018 ; accessed on February 24, 2018 (English).
| personal data | |
|---|---|
| SURNAME | Darcy, Henry |
| ALTERNATIVE NAMES | Darcy, Henry Philibert Gaspard (full name) |
| BRIEF DESCRIPTION | French engineer |
| DATE OF BIRTH | June 10, 1803 |
| PLACE OF BIRTH | Dijon , France |
| DATE OF DEATH | January 3, 1858 |
| Place of death | Paris |