.FCSys.Species.N2.Gas.Fixed

Fixed properties

Information

Assumptions:

  1. The generalized resistivities (η, θ) are fixed (e.g., independent of thermodynamic state).
  2. Ideal gas
  3. Fixed specific heat capacity (independent of temperature)

The default specific heat capacity (via bc = [1.041e3*U.J*Data.m/(U.kg*U.K)]) and resistivities (η = 1/(17.82e-6*U.Pa*U.s) and θ = U.m*U.K/(25.9e-3*U.W))) are based on data of gas at 1 atm and 300 K from Incropera and DeWitt [Incropera2002, p. 920]. The integration offset for specific entropy (Bc) is set such that the specific entropy is 191.610 J/(mol·K) at 25 °C and po (1 bar). This is the value from Table B in [McBride2002]. Additional data is listed in Table 1.

Table 1: Properties of N2 gas at 1 atm [Incropera2002, p. 920]
T
/U.K		 cp*U.kg*U.K
/(U.J*Data.m)		 η
*U.Pa*U.s		 θ*U.W
/(U.m*U.K)
100 1.070e3 1/68.8e-7 1/9.58e-3
150 1.050e3 1/100.6e-7 1/13.9e-3
200 1.043e3 1/129.2e-7 1/18.3e-3
250 1.042e3 1/154.9e-7 1/22.2e-3
300 1.041e3 1/178.2e-7 1/25.9e-3
350 1.042e3 1/200.0e-7 1/29.3e-3
400 1.045e3 1/220.4e-7 1/32.7e-3
450 1.050e3 1/239.6e-7 1/35.8e-3
500 1.056e3 1/257.7e-7 1/38.9e-3
550 1.065e3 1/274.7e-7 1/41.7e-3
600 1.075e3 1/290.8e-7 1/44.6e-3
700 1.098e3 1/320.1e-7 1/49.9e-3
800 1.220e3 [sic] 1/349.1e-7 1/54.8e-3
900 1.146e3 1/375.3e-7 1/59.7e-3
1000 1.167e3 1/399.9e-7 1/64.7e-3
1100 1.187e3 1/423.2e-7 1/70.0e-3
1200 1.204e3 1/445.3e-7 1/75.8e-3
1300 1.219e3 1/466.2e-7 1/81.0e-3

The fluidity of air at 15 °C and 1 atm is given by η = 1/(17.8e-6*U.Pa*U.s) (http://en.wikipedia.org/wiki/Viscosity).

For more information, please see the Species model.

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