Ohnesorge Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Ohnesorge number, abbreviated as Oh, is a dimensionless number that relates the viscous force to inertial forces and surface tension forces.

Ohnesorge Number FORMULA

(Eq. 1)  \(\large{ Oh = \frac {\mu}  {\sqrt { \rho \; \sigma \;l } }   }\)        

(Eq. 2)  \(\large{ Oh = \frac {\sqrt { We } } { Re }   }\)         

Where:

\(\large{ Oh }\) = Ohnesorge number

\(\large{ l_c }\) = characteristic length

\(\large{ \rho }\)  (Greek symbol rho) = density

\(\large{ Re }\) = Reynolds number

\(\large{ \sigma }\)  (Greek symbol sigma) = surface tension

\(\large{ \mu }\)  (Greek symbol mu) = viscosity

\(\large{ We }\) = Weber number

 

Tags: Equations for Force