Hi,
Does anybody know where
Hi,
Does anybody know where to look up sutherlandTransport coefficients (A_s and T_s)? I need them for hydrogen (H2), but it would be nice to know where there's a table to look at? Greetings, Lasse 
Hi,
Just to agree with the
Hi,
Just to agree with the notations: Sutherland's law with two or three coefficients can write: mu = C1 T^(3/2) / (T+C2) and mu = mu_0 ( T / T_0)^(3/2) (T_0+S) / (T+S) where, mu is the viscosity (in kg/ms) T is the temperature (in K) C1 and C2 are the coefficients mu_0 is a reference value (in kg/ms) T_0 is a reference temperature (in K) S is an effective temperature calso called Sutherland constant (in K) For hydrogen (H2) C1 = 8.411 e6 C2 = 273.11 mu_0 = 8.411 e6 kg/(m.s) T_0= 273.11 K S = 96.67 K Values for the coefficients can be found in: Saxena, S.C., 'Viscosity of Multicomponent Mixtures of Gases,' Proceed ings of the Sixth Svmposirun on Thermophvsical Properties, Liley, P.E, ed., American Society of Mechanical Engineers, 1973, pp. 100110. Touloukian, Y.S., Liley P.E and Saxena, S.C., 'Thermal Conductivitv. Nonmetallic Liauids and Gases,' Thermophysical Properties of Matter, The TPBC Data Series, Vol. 3, IFI/Plenum Data Corporation, New Pork, 1970a. More recent references probably exist too. Regards, isabelle 
Thank you
Thank you

There is obviously a mistake in isabelle´s answer. Just by looking at the two equations she gave (which are, by the way, correct), one can easily see that the 2parameter equation is nothing but a simplification of the 3parameter equation, where C1 contains all constants and C2 equals S.
However, C1 and C2 are usually given nondimensional values. So, C2 = S / (1K) = 96.67 and C1 = mu_0 (T_0)^(3/2) (T_0+S) / (1 kg/m.s.K^(1/2)), i.e. C1 = 6.89e7 using isabelle´s values. This agrees pretty well with the values one can find in "Zahlenwerte & Funktionen" of Landolt and Börnstein, IV. Band  1.Teil (1925?): C1 = 6.71e7 (when nondimensionalized from SI units) and C2 = 83. The values of mu_0, T_0 and S isabelle gave are correct though. She simply did not copy/compute the right values for C1 and C2. 
Hello All
Somebody have this references that Isabelle posted here ? (pdf. version) Saxena, S.C., 'Viscosity of Multicomponent Mixtures of Gases,' Proceed ings of the Sixth Svmposirun on Thermophvsical Properties, Liley, P.E, ed., American Society of Mechanical Engineers, 1973, pp. 100110. Touloukian, Y.S., Liley P.E and Saxena, S.C., 'Thermal Conductivitv. Nonmetallic Liauids and Gases,' Thermophysical Properties of Matter, The TPBC Data Series, Vol. 3, IFI/Plenum Data Corporation, New Pork, 1970a. Could you send me by email ? Many thanks ! 
Dear Rophys,
Did you manage to find these references, because I can't. Thank You Stratos 
All times are GMT 4. The time now is 12:29. 