Poiseuille's equation
(also Poiseuille equation) Physics
noun
An equation expressing the relation between the volume V of fluid flowing per second through a long narrow cylinder under conditions of Poiseuille flow, the viscosity of the fluid, and the dimensions of the cylinder, namely V = πr 4 p/8ηl, where p is the difference in pressure between the ends of the cylinder, η is the viscosity of the fluid, l is the length of the cylinder, and r is its radius.
Origin
Early 20th century; earliest use found in Journal of Physical Chemistry.