sutherland law?
hi
i have a question regarding the Sutherland law for air s=110 mo=1.715 t0=273.11 does the co-efficients vary with altitude of air? for example for 10000m mo=1.458e^-5 how do i calculate S? thanks in advance |
Hi
whats "mo"? didn't you get anything by searching? |
s=sutherland temperature
m0=reference viscosity to=reference temperature i looked at several places on the net to=remains the same for all s and m0 changes for different materials However mo will change for different altitude for air(data available) but i do not know how to calculate s corresponding to the new mo |
http://www.cfd-online.com/Forums/mai...rland-law.html
Anderson too in the Fundamentals of Aerodynamics 5th Edition, gives S=110 |
Hi, I would say that for a certain fluid the coefficients are constant, viscosity only changes with temperature. The viscosity of air varies indirectly with altitude through temperature.
Cheers, Michujo. |
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Hi, can you please elaborate?
Thanks, Michujo. |
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thank you all for replying
so in other words the 3 coefficients mo ,to,s remain the same for any altitude as long as im taking air as ideal gas in fluent the actual viscosity m will vary as a function of temperature t. that clears my doubt .thank you |
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