Laplace Number

Laplace number, abbreviated as La, also called Suratman number, abbreviated as Su, a dimensionless numbers, they are 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
\(\large{ La =  \frac { \sigma \; \rho \; l } { \eta^2 }  }\)
Symbol	English	Metric
\(\large{ La }\) = Laplace number	\(\large{dimensionless}\)
\(\large{ \rho }\)  (Greek symbol rho) = density	\(\large{\frac{lbm}{ft^3}}\)	\(\large{\frac{kg}{m^3}}\)
\(\large{ l }\) = length	\(\large{ft}\)	\(\large{m}\)
\(\large{ \sigma }\)  (Greek symbol sigma) = surface tension	\(\large{\frac{lbf}{ft}}\)	\(\large{\frac{N}{m}}\)
\(\large{ \eta }\)  (Greek symbol eta) = viscosity of liquid	\(\large{\frac{lbf-sec}{ft^2}}\)	\(\large{Pa-s}\)

 

Laplace number calculator