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

\(Le = \frac{  \alpha }{ D_m }\)          \( Lewis \; number  \;=\;   \frac{  thermal \; diffusivity  }  { mass \; diffusivity }\)

Where:

\(Le\) = Lewis number

\( \alpha \) = thermal diffusivity

\( D_m\) = mass diffusivity

Solve for:

\( \alpha = Le    D_m  \)

\(D_m = \frac{  \alpha }{ Le }\)

 

Tags: Equations for Temperature Equations for Mass