Lewis Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Lewis Number

Lewis number ( \(Le\) ) (dimensionless number) is giving the ratio of thermal diffusivity to mass diffusivity.

Lewis Number formula

\(\large{ Le = \frac{  \alpha }{ D_m }   }\)         

Where:

\(\large{ Le }\) = Lewis number

\(\large{ \alpha }\)  (Greek symbol alpha) = thermal diffusivity

\(\large{ D_m }\) = mass diffusivity

Solve for:

\(\large{ \alpha = Le    D_m  }\)

\(\large{ D_m = \frac{  \alpha }{ Le }  }\)

 

Tags: Equations for Temperature Equations for Mass