Eckert number
The Eckert number is a dimensionless number used in continuum mechanics. It expresses the relationship between a flow's kinetic energy and the boundary layer enthalpy difference, and is used to characterize heat transfer dissipation. It is named after Ernst R. G. Eckert.
It is defined as
whereu is the local flow velocity of the continuum,cp is the constant-pressure local specific heat of the continuum,
- is the difference between wall temperature and local temperature.