A-to-Z Guide to Thermodynamics,
Heat & Mass Transfer, and Fluids Engineering
English Русский 中文 Português Español Français Deutsch About Editors Contact us Access Begell House
View in A-Z Index

The Lewis Number (Le) is defined as the ratio of the Schmidt Number (Sc) and the Prandtl Number (Pr). The Lewis Number is also the ratio of thermal diffusivity and molecular diffusivity as is found from the definitions of Schmidt and Prandtl Number, as follows:

(1)

where κ = (λ/ρcp) is the Thermal Diffusivity. The Lewis Number is important in determining the relationship between mass and heat transfer coefficients (the Lewis Relationship).

Number of views: 39675 Article added: 2 February 2011 Article last modified: 11 February 2011 © Copyright 2010-3921 Back to top
A-Z Index Authors / Editors Semantic Map Visual Gallery Contribute Guest