# Galileo Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Galileo number ( $$Ga$$ ) (dimensionless number) (also known as Galilei number) is a ratio of forces present in the flow of viscous fluids.  It is used in the momentum of heat transfer, viscous flow, thermal expansion.

### Galilei Number FORMULA

$$\large{ Ga = \frac{ g \; l^3 \; \mu^2 } { \rho^2 } }$$

Where:

$$\large{ Ga }$$ = Galileo number

$$\large{ l_c }$$ = characteristic length

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

$$\large{ g }$$ = gravitational acceleration

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