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-   -   Viscosity variation with temperature for gases- (http://www.cfd-online.com/Forums/main/10116-viscosity-variation-temperature-gases.html)

Kedar October 19, 2005 08:54

Viscosity variation with temperature for gases-
 
We would appreciate if some one gives us some formula for varation of viscosity for exhaust gases with temperature in the range of 300K to 600K other than Sutherlands formula.


buch October 19, 2005 10:01

Re: Viscosity variation with temperature for gases
 
Hi,

As an alternative to the Sutherland's law, check the power-law : http://www.grc.nasa.gov/WWW/cgns/sid...ViscosityModel

Sincerely, the result will almost be the same, except that the power law should not be used for temperatures higher than 500K ...

Anyway Sutherland's law might be more accurate ...

Good luck

Buch

Salvador October 19, 2005 11:21

Re: Viscosity variation with temperature for gases
 
Use Lennard-Jones potentials. The difference is L-J takes into account the intermollecular forces, do not expcet much differnces in "normal" conditions.

Kedar October 24, 2005 06:43

Re: Viscosity variation with temperature for gases
 
Thank you guys for your help.

Kedar


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