The Eckert number 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
where
- is a characteristic velocity of the flow.
- is the constant-pressure specific heat of the flow.
- is a characteristic temperature difference of the flow.
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