Jean Louis Marie Poiseuille
Born	April 22, 1797 (1797-04-22) Paris
Died	December 26, 1869 (1869-12-27) Paris
Nationality	French
Fields	physician and physiologist
Alma mater	École Polytechnique
Known for	Poiseuille's law

Jean Louis Marie Poiseuille \pwä-'zəi\ (April 22, 1797 - December 26, 1869) was a French physician and physiologist.

Poiseuille was born in Paris, France.

From 1815 to 1816 he studied at the École Polytechnique in Paris. He was trained in physics and mathematics. In 1828 he earned his D.Sc. degree with a dissertation entitled Recherches sur la force du coeur aortique. He was interested in the flow of human blood in narrow tubes.

[edit] Poiseuille's equation

In 1838 he experimentally derived, and in 1840 and 1846 formulated and published, Poiseuille's law (now commonly known as the Hagen–Poiseuille equation for also, Gotthilf Hagen). This concerns the voluminal laminar stationary flow of an incompressible uniform viscous liquid (so-called Newtonian fluid) through a cylindrical tube with constant circular cross-section. In other words, it applies to non-turbulent flow of liquids through pipes. It can be successfully applied to blood flow in capillaries and veins, to air flow in lung alveoli, for the flow through a drinking straw or through a hypodermic needle.

where:

ΔP is the pressure drop

L is the length of pipe

μ is the dynamic viscosity

Q is the volumetric flow rate

r is the radius

π is pi

The cgs unit of viscosity, Poise was named after him. Attempts to introduce "Poiseuille" as name of the SI unit Pa.s had little success.

Poiseuille died in Paris.

[edit] See also

• Newtonian fluid
• Viscosity

[edit] References

• Pfitzner, J (1976), "Poiseuille and his law.", Anaesthesia 31 (2): 273–5, 1976 Mar, doi:10.1111/j.1365-2044.1976.tb11804.x, PMID 779509 

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