.FCSys.Species.N2.Gas.Fixed

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 b_c = [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 (B_c) is set such that the specific entropy is 191.610 J/(mol·K) at 25 °C and p^o (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.