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Template:Unreferenced stub The Eckert number (Ec) is a dimensionless number used in fluid dynamics. It expresses the relationship between a flow's kinetic energy and enthalpy, and is used to characterize dissipation. It is named after Ernst R. G. Eckert.

It is defined as

$\mathrm{E}\mathrm{c}=\frac{V^2}{c_p\mathrm{\Delta }T}=\frac{\text{Kinetic Energy}}{\text{Enthalpy}}$

where

• V is a characteristic velocity of the flow.
• c_p is the constant-pressure specific heat of the flow.
• ∆T is a characteristic temperature difference of the flow.