Sutherland's Law Coefficients for Argon
Hi,
Does anyone know where I could find values for the sutherland's law coefficients that define the viscosity of Argon (S,Mu0 and T0)? I have searched the web with google extensivley but cannot find a reference thanks 
Re: Sutherland's Law Coefficients for Argon
Reference Viscosity, Mu0(kg/ms) = 2.125e05 Reference Temeprature, T0(K) = 273.11 Effective Temperature, S(K) = 144.4
Hope it helps Regards Apurva 
Re: Sutherland's Law Coefficients for Argon
Hi Apurva,
Thanks for your response. Would you be able to tell me where this information comes from so that I can reference it in my report. Thanks. 
Re: Sutherland's Law Coefficients for Argon
Michael,
I have used data from two sources: CRC handbook and data in the NIST online database (http://properties.nist.gov/SemiProp/Gases/ar.html ). I then fitted it to Sutherland's law, resulting in S = 164.2K, Tref = 1000K, MUref = 55.8[microPas] 
Re: Sutherland's Law Coefficients for Argon
Hi Michael
Mine information comes from Fluent. Actually Fluent has a database of such properties. Regards Apurva 
Re: Sutherland's Law Coefficients for Argon
Apurva,
Sorry for arguing, but I have put your coefficients in Sutherland's law and plotted it on top of mine and the data points from CRC and NIST. It falls somewhat below the actual viscosity, whereas my fit is closer. You may check it for yourself. for your convenience, the data is: p=1bar source CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC CRC NIST NIST NIST NIST T[K] 85 90 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 500 600 700 800 900 1000 visc.[uPas] 278.8 7.5 8.2 9.8 11.4 13.0 14.5 16.0 17.5 18.9 20.3 21.6 22.9 24.2 25.4 26.6 27.8 28.8 34.2 39.0 43.6 47.9 51.9 55.8 References: CRC handbook '97'98, pp. 618, 6194, 6201. NIST: http://properties.nist.gov/SemiProp/Gases/ar.html Notes: o p=1bar o At T=85K Ar is condensed o T=1000K is my choice of Tref 
Re: Sutherland's Law Coefficients for Argon
Thanks both of you for you help. I worked out the relative difference in the models to be 13% (independent of temperature ofcourse). Either one will work ok for me.

Re: Sutherland's Law Coefficients for Argon
Viscous Fluid Flow by Frank White (McGrawHill) provides the numbers for Argon. However, he simply reproduces the numbers from another reference (Hilsenrath, J., et al, Tables of Thermodynamic and Transport Properties, National Bureau of Standards, 1955.)

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