# Knudsen number

(Difference between revisions)
 Revision as of 04:06, 21 September 2005 (view source)← Older edit Revision as of 05:42, 21 September 2005 (view source)Praveen (Talk | contribs) Newer edit → Line 7: Line 7: Knudsen number is a measure of the rarefaction of the flow.The various [[Flow regimes ]] can be classifed based on Knudsen number. Knudsen number is a measure of the rarefaction of the flow.The various [[Flow regimes ]] can be classifed based on Knudsen number. + + [[Category: Dimensionless parameters]]

## Revision as of 05:42, 21 September 2005

The Knudsen number is defined as

$Kn\equiv \frac{\lambda}{L}$

where

• $\lambda$ is the mean free path of the molecules
• $L$ is the characteristic dimension

Knudsen number is a measure of the rarefaction of the flow.The various Flow regimes can be classifed based on Knudsen number.