Contents - Index
IdealGasMixtureProps is an EES Procedure that will determine the specific enthalpy, entropy, viscosity and thermal conductivity of a mixture of ideal gases.
F$ a string constant or string variable that contains the names of 1 or more (up to 20) names of ideal gases that are contained in the EES property library. The names of the gases are separated with a + sign, e.g., 'CH4+C3H8'
T the temperature in the units EES is configured to work in.
P the pressure in the units EES is configured to work in. (Pressure is used only for calculation of specific entropy)
f[1..N] the mass or mole fractions of the gases represented by string F$. The sum of the values of f must add to 1.0. Supply mass fractions if EES is configured to work with specific properties on a mass basis. Otherwise, supply mole fractions.
MW The molar mass of the mixture in kg/kmol or lbm/lbmol
h the specific enthalpy of the mixture determined as the mole fraction-weighted average of the gases in the mixture. The units of h will be returned on a per unit mass basis if EES is configured to provide properties on a mass basis. Otherwise the units of h will be returned on a molar basis.
s the specific entropy of the mixture determined as the mole fraction-weighted average of the gases in the mixture plus the entropy change of mixing the gases. The units of s will be returned on a per unit mass basis if EES is configured to provide properties on a mass basis. Otherwise the units of s will be returned on a molar basis.
mu The viscosity of the gas mixture determined using the Wilke Approximation as described in Eq. 9-5.2 of Reid, Prausnitz, and Sherwood.
k The thermal conductivity of the gas mixture determined using the Mason and Saxena modification, as described in Eq. 10-6.2. of Reid, Prausnitz, and Sherwood.
Reid, Prausnitz, and Sherwood, 3rd edition, McGraw-Hill, (1977).
IdealGasMixtureProps is not built into EES. Rather, it is an external Procedure that is loaded from the ..\USERLIB\EES_System\IdealGasmixtureProps.LIB. This file is provided in the EES installation.
$UnitSystem SI C kPa molar kJ
Call idealgasmixtureprops(F$,T,P,y[1..N]: MW, h, s, mu, k)
See also: Thermophysical Functions