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

\(\large{ Ec = \frac{U^2 } {2  \; c \;  \Delta T}   }\) 

Where:

 Units English SI
\(\large{ Ec }\) = 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 \(\large{F}\) \(\large{K}\)

 

 

Tags: Equations for Energy