.FCSys.Species.H2O.Gas.Fixed

Information

Assumptions:

  1. The generalized resistivities (η, θ) are fixed (e.g., independent of thermodynamic state).
  2. Ideal gas
  3. The specific exchange currents (τ′) are zero. The rate of phase change is governed by the other configurations (liquid and ionomer).

The default resistivities (η = 1/(9.09e-6*U.Pa*U.s) and θ = U.m*U.K/(19.6e-3*U.W)) are of H2O gas at saturation pressure and 300 K from Incropera and DeWitt [Incropera2002, p. 921]. Table 1 lists the properties at saturation pressure and other temperatures. Table 2 lists the properties of H2O gas at 1 atm. See also http://www.engineeringtoolbox.com/water-dynamic-kinematic-viscosity-d_596.html.

Table 1: Properties of H2O gas at saturation pressure [Incropera2002, pp. 924–925].
T
/U.K		 cp*U.kg*U.K
/(U.J*Data.m)		 η
*U.Pa*U.s		 θ*U.W
/(U.m*U.K)
273.1518541/8.02e-61/18.2e-3
27518551/8.09e-61/18.3e-3
28018581/8.29e-61/18.6e-3
28518611/8.49e-61/18.9e-3
29018641/8.69e-61/19.3e-3
29518681/8.89e-61/19.5e-3
30018721/9.09e-61/19.6e-3
30518771/9.29e-61/20.1e-3
31018821/9.49e-61/20.4e-3
31518881/9.69e-61/20.7e-3
32018951/9.89e-61/21.0e-3
32519031/10.09e-61/21.3e-3
33019111/10.29e-61/21.7e-3
33519201/10.49e-61/22.0e-3
34019301/10.69e-61/22.3e-3
34519411/10.89e-61/22.6e-3
35019541/11.09e-61/23.0e-3
35519681/11.29e-61/23.3e-3
36019831/11.49e-61/23.7e-3
36519991/11.69e-61/24.1e-3
37020171/11.89e-61/24.5e-3
373.1520291/12.02e-61/24.8e-3
37520361/12.09e-61/24.9e-3
38020571/12.29e-61/25.4e-3
38520801/12.49e-61/25.8e-3
39021041/12.69e-61/26.3e-3
40021581/13.05e-61/27.2e-3
41022211/13.42e-61/28.2e-3
42022911/13.79e-61/29.8e-3
43023691/14.14e-61/30.4e-3
44024601/14.50e-61/31.7e-3
45025601/14.85e-61/33.1e-3
46026801/15.19e-61/34.6e-3
47027901/15.54e-61/36.3e-3
48029401/15.88e-61/38.1e-3
49031001/16.23e-61/40.1e-3
50032701/16.59e-61/42.3e-3
51034701/16.95e-61/44.7e-3
52037001/17.33e-61/47.5e-3
53039601/17.72e-61/50.6e-3
54042701/18.1e-61/54.0e-3
55046401/18.6e-61/58.3e-3
56050901/19.1e-61/63.7e-3
57056701/19.7e-61/76.7e-3
58064001/20.4e-61/76.7e-3
59073501/21.5e-61/84.1e-3
60087501/22.7e-61/92.9e-3
610111001/24.1e-61/103e-3
620154001/25.9e-61/114e-3
635183001/27.0e-61/121e-3
630221001/28.0e-61/130e-3
635276001/30.0e-61/141e-3
640420001/32.0e-61/155e-3

Table 2: Properties of H2O gas at 1 atm [Incropera2002, p. 921].
T
/U.K		 cp*U.kg*U.K
/(U.J*Data.m)		 η
*U.Pa*U.s		 θ*U.W
/(U.m*U.K)
3802.060e31/127.1e-71/24.6e-3
4002.014e31/134.4e-71/26.1e-3
4501.980e31/152.5e-71/29.9e-3
5001.985e31/170.4e-71/33.9e-3
5501.997e31/188.4e-71/37.9e-3
6002.206e31/206.7e-71/42.2e-3
6502.056e31/224.7e-71/46.4e-3
7002.085e31/242.6e-71/50.5e-3
7502.119e31/260.4e-71/54.9e-3
8002.152e31/278.6e-71/59.2e-3
8502.186e31/296.9e-71/63.7e-3

The specific heat capacity is not fixed because it would affect the chemical potential and result in an incorrect cell potential.

The relative humidities (RH and RHboundaries), which are calculated as output variables, do not account for surface tension.

For more information, please see the Species model.

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