Jakob Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Jakob number, abbreviated as Ja, a dimensionless number, is the ratio of sensible latent heat absorbed or released during liquid vapor phase change.


Jakob Number formula

\(\large{ Ja = \frac{ c_p \; \left( T_s \;-\; T_{sat} \right) }{\Delta h_f}  }\)   


\(\large{ Ja }\) = Jakob number

\(\large{ c_p }\) = constant pressure at specific heat

\(\large{ \Delta h_f }\)  = evaporation enthalpy change

\(\large{ T_{sat} }\) = temperature saturation point

\(\large{ T_s }\) = total stagnation temperature


Tags: Equations for Heat Transfer Equations for Vapor