# Eckert number

The **Eckert number** (**Ec**) 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.[1] It is named after Ernst R. G. Eckert.

It is defined as

where

*u*is the local flow velocity of the continuum,*c*is the constant-pressure local specific heat of the continuum,_{p}- is the difference between wall temperature and local temperature.

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