Laplace Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Laplace number ( \(La\) ) (also called Suratman number \(Su\) ) (dimensionless number) is used in the charcaterization of free surface fluid dynamics.  It is a ratio of surface tension to the momentum transport inside a fluid.

Laplace Number Formula

\(\large{ La =  \frac { \sigma \rho l } { \eta^2 }  }\)         


\(\large{ La }\) = Laplace number

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

\(\large{ l }\) = length

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

\(\large{ \eta }\)  (Greek symbol eta) = viscosity of the liquid


Tags: Equations for Fluid