Poiseuille's law

American  

[pwah-zweez] / pwɑˈzwiz /

noun

Physics, Mechanics.

1. the law that the velocity of a liquid flowing through a capillary is directly proportional to the pressure of the liquid and the fourth power of the radius of the capillary and is inversely proportional to the viscosity of the liquid and the length of the capillary.

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Etymology

Origin of Poiseuille's law

First recorded in 1880–85; see origin at poise ²

Example Sentences

See Examples For:

Poiseuille's law

Figure 12.15 Poiseuille's law applies to laminar flow of an incompressible fluid of viscosity η through a tube of length l and radius r .

From Textbooks ● Aug. 12, 2015

The circulatory system provides many examples of Poiseuille's law in action—with blood flow regulated by changes in vessel size and blood pressure.

From Textbooks ● Aug. 12, 2015

But it is surprising that r is raised to the fourth power in Poiseuille's law.

From Textbooks ● Aug. 12, 2015

Deviations from Poiseuille’s law in the capillaries make only a small correction to these values.

From Nature ● Apr. 4, 2014