Using the Lewis Number

The Lewis number L e is defined as the ratio of thermal diffusion to mass diffusion D m .

The Lewis number is expressed as follows:

Figure 1. EQUATION_DISPLAY
L e ≡ k / ρ C p D m
(138)

where ρ , C p , and k are the density, specific heat, and thermal conductivity of the mixture, respectively.

Given values for L e , D m , ρ , and C p , thermal conductivity k can be calculated as follows:

Figure 2. EQUATION_DISPLAY
k = L e D m ρ C p
(139)

The properties for this method are set in the Properties window.



Lewis Number Properties

Lewis Number The value of Lewis number that is used for specifying the ratio of thermal diffusion to mass diffusion.