Elasticity Number

Elasticity number, abbreviated as El, a dimensionless number, is the ratio of elastic force to internal force in viscoelastic flow.

 

Elasticity Number formula
\(\large{ El = \frac { t \; \eta} { \rho \; r^2 } }\)
Symbol	English	Metric
\(\large{ El }\) = elasticity number	\(\large{ dimensionless }\)
\(\large{ \rho }\)   (Greek symbol rho) = density	\(\large{\frac{lbm}{ft^3}}\)	\(\large{\frac{kg}{m^3}}\)
\(\large{ r }\) = pipe radius	\(\large{ in }\)	\(\large{ mm }\)
\(\large{ t }\) = relaxation time	\(\large{ sec }\)	\(\large{ s }\)
\(\large{ \eta }\)  (Greek symbol eta) = viscosity	\(\large{\frac{lbf - sec}{ft^2}}\)	\(\large{ Pa - s }\)