Eckert Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Eckert number, abbreviated as Ec, a dimensionless number, is used to calculate the ratio of the kinetic energy to enthalpy.


Eckert Number formula

\(\large{ Ec = \frac{ U^2 }{ 2 \; c \; \Delta T }   }\) 
Symbol English Metric
\(\large{ Ec }\) = Eckert number \(\large{dimensionless}\)
\(\large{ U }\) = characteristic flow velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)
\(\large{ c }\) = specific heat \(\large{\frac{Btu}{lbm-F}}\)  \(\large{\frac{J}{kg-K}}\) 
\(\large{ \Delta T }\) = temperature change \(\large{F}\) \(\large{K}\)


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Tags: Energy Equations