# Elasticity Number

Elasticity number ( \(El\) ) (dimensionless number)

### Elasticity Number FORMULA

\(\large{ El = \frac { t \eta} { \rho r^2 } }\)

Where:

\(\large{ El }\) = elasticity number

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

\(\large{ r }\) = pipe radius

\(\large{ t }\) = relaxation time

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

Tags: Equations for Stress