Capillary Number

Capillary number, abbreviated as Ca, is a dimensionless number representing the relative effect of viscous forces against the surface tension between a liquid/ gas or liquid/ liquid interface.  It is the ratio of viscous forces to surface tension forces. The equations for Capillary Number and calculation are shown below.

 

Capillary number calculator

	Capillary number formula \(\large{ Ca = \frac { \mu \; v }  { \sigma } }\)    Where: \(\large{ Ca }\) = Capillary number \(\large{ \mu }\)  (Greek symbol mu) = dynamic viscosity \(\large{ \sigma }\)  (Greek symbol sigma) = shear tension \(\large{ v }\) = velocity of fluid