Ohnesorge Number

Compute viscous damping relative to inertial-capillary effects, plus the Laplace number.

visual calculatorMultiphase Flow

Read the flow shape before trusting the number.

This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.

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Ohnesorgedropletjet breakupsurface tension

formula

KaTeX rendered

\begin{aligned}\text{Oh = mu / sqrt(rho sigma L)}\\[0.35em]\text{La = 1 / Oh\^{}2}\end{aligned}

ASCII source

Oh = mu / sqrt(rho sigma L), La = 1 / Oh^2

mu (Pa s)rho (kg/m^3)sigma (N/m)L or d (m)

0.0037

La = 1/Oh^2

7.186e+4

Ohnesorge separates viscous damping from inertial-capillary breakup in droplets, jets, and atomization.

Ohnesorge droplet jet breakup surface tension