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Lewis number

Lewis number is a dimensionless number defined as the ratio of thermal diffusivity to mass diffusivity. It is used to characterize fluid flows where there is simultaneous heat and mass transfer by convection.

It is defined as:

\mathit{Le} = \frac{\alpha}{\mathit{D}}

where α is the thermal diffusivity and D is the mass diffusivity.

The Lewis number can also be expressed in terms of the Schmidt number and the Prandtl number :

\mathit{Le} = \frac{\mathit{Sc}}{\mathit{Pr}}.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lewis_number". A list of authors is available in Wikipedia.
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