Ohnesorge Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Ohnesorge Number

Ohnesorge number ( \(Oh\) ) (dimensionless number) relates the viscous force to inertial forces and surface tension forces.

Ohnesorge Number FORMULA

\(Oh = \frac {\mu}  {\sqrt { \rho \sigma l } } \)          \( Ohnesorge \; number  \;=\;  \frac { viscosity }  {\sqrt  { \; density \;\;x\;\;  surface \; tension  \;\;x\;\;  characteristic \; length } } \)

\(Oh = \frac {\sqrt { We } } { Re } \)          \( Ohnesorge \; number  \;=\;  \frac {\sqrt  { \; Weber \; number } } { Reynolds \; number } \)

Where:

\(Oh\) = Ohnesorge number

\(\mu\) (Greek symbol mu) = viscosity

\(\rho\) (Greek symbol rho) = density

\(l\) = characteristic length

\(\sigma\) (Greek symbol sigma) = surface tension

\(We\) = Weber number

\(Re\) = Reynolds number

 

Tags: Equations for Force