My watch list
my.chemeurope.com

# Eckert number

The Eckert number is a dimensionless number used in flow calculations. It expresses the relationship between a flow's kinetic energy and enthalpy, and is used to characterize dissipation. It is named for the late professor Ernst R. G. Eckert.

It is defined as

$\mathit{Ec}=\frac{V^2}{c_p\Delta T} = \frac{\mbox{Kinetic Energy}}{\mbox{Enthalpy}}$

where

• V is a characteristic velocity of the flow.
• cp is the constant-pressure specific heat of the flow.
• ΔT is a characteristic temperature difference of the flow.