# Eckert Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Eckert number, abbreviated as Ec, a dimensionless number, is used to calculate the ratio of the kinetic energy to enthalpy.

## Eckert Number formula

 $$\large{ Ec = \frac{U^2 } {2 \; c \; \Delta T} }$$

### Where:

 Units English SI $$\large{ Ec }$$ = Eckert number $$\large{dimensionless}$$ $$\large{ U }$$ = characteristic flow velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ c }$$ = specific heat $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{J}{kg-K}}$$ $$\large{ \Delta T }$$ = temperature change $$\large{F}$$ $$\large{K}$$

Tags: Equations for Energy