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Poiseuille's Law of Laminar Flow

by Greg Crowther


Lyrics

When you wanna think-a like Poiseuille,
There's a formula you employ.
When the blood flows around and around and around,
The flow rate through a given vessel can be found

As R times R times R times R
(That's R to the fourth)
Times delta-P,
And that's all divided by
Eight over pi
Times the length of the vessel
Times viscosity.

R times R times R times R
(That's R to the fourth)
Times delta P,
And that's all divided by
Eight over pi
Times the length of the vessel
Times viscosity.


Comments

A short song, written for BIOL 220 at the University of Washington, about the factors governing blood flow. Ideally, it should be performed with a peppy zydeco feel. In this formulation of Poiseuille's Law, R stands for radius and delta P is the difference in pressure. (Alternatively, the law can be written simply as delta P over resistance. Resistance may also be abbreviated R, so be careful!)

The repetition of "R times R times R times R" emphasizes that blood flow rate is highly sensitive to vessel radius. In addition, the rhyme with "employ" helps people pronounce "Poiseuille," a difficult surname.