Lewis Number
Lewis number, abbreviated as Le, a dimensionless number, is the ratio of thermal diffusivity to mass diffusivity. It is used to characterize fluid flows where there is simultaneous heat and mass transfer. Some common values of nonmetallic thermal diffusivity values can be found here.
Lewis number calculator
Lewis number formula
Where:\(\large{ Le }\) = Lewis number \(\large{ D_m }\) = mass diffusivity \(\large{ \alpha }\) (Greek symbol alpha) = thermal diffusivity

Tags: Equations for Temperature Equations for Mass Calculators