Fluid Mechanics
Advanced

Poiseuille's Law

Laminar flow rate through a pipe.

Formula

Q=πr4ΔP8μLQ = \frac{\pi r^4 \Delta P}{8\mu L}

Variables

rRadius
\Delta PPressure diff
\muViscosity
LLength

Did You Know?

Poiseuille's law is why narrowed arteries force the heart to work dramatically harder to keep blood flowing.

poiseuilleflowviscosity