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 Michael June 22, 2003 04:13

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

 Apurva June 22, 2003 07:20

Re: Sutherland's Law Coefficients for Argon

Reference Viscosity, Mu0(kg/m-s) = 2.125e-05 Reference Temeprature, T0(K) = 273.11 Effective Temperature, S(K) = 144.4

Hope it helps

Regards

Apurva

 Michael Elford June 22, 2003 20:48

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.

 Rami June 23, 2003 01:30

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[microPa-s]

 Apurva June 23, 2003 06:00

Re: Sutherland's Law Coefficients for Argon

Hi Michael

Mine information comes from Fluent. Actually Fluent has a database of such properties.

Regards

Apurva

 Rami June 24, 2003 03:20

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.[uPa-s] 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. 6-18, 6-194, 6-201.

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

 Michael Elford June 24, 2003 05:46

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.

 BeachComber June 24, 2003 15:38

Re: Sutherland's Law Coefficients for Argon

Viscous Fluid Flow by Frank White (McGraw-Hill) 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.)

 estang February 27, 2015 06:06

Quote:
 Originally Posted by Rami ;25031 o T=1000K is my choice of Tref
The NIST chemistry webbook only provides data to 700 K to me when i request for isobaric data of Ar at 1 bar. Is your Tref really 1000K?

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