MethaneFluidProperties

Fluid properties for methane (CH4)

Fluid properties for methane are mainly calculated using the Setzmann and Wagner equation of state (Setzmann and Wagner, 1991). This formulation uses density and temperature as the primary variables with which to calculate properties such as density, enthalpy and internal energy.

When used with the pressure and temperature interface, which is the case in the Porous Flow module, methane properties are typically calculated by first calculating density iteratively for a given pressure and temperature. This density is then used to calculate the other properties, such as internal energy, directly. The computational expense associated with the iterative calculation can be mitigated using TabulatedFluidProperties.

For low pressures (typically less than 10 MPa), the properties of methane can be approximated using an ideal gas, which are much faster to calculate. However, at higher pressures, this approximation can lead to large differences, see Figure 1.

Figure 1: Methane density at 350K for various pressures.

Transport properties such as viscosity and thermal conductivity are calculated using the formulations provided in Irvine Jr and Liley (1984).

Dissolution of methane into water is calculated using Henry's law (IAPWS, 2004).

Properties of methane

Property	value
Molar mass	0.0160425 kg/mol
Critical temperature	190.564 K
Critical pressure	4.5992 MPa
Critical density	162.66 kg/m $var element = document.getElementById("moose-equation-89b4a2dd-a5b7-457b-b88a-2f69f856e193");katex.render("^3", element, {displayMode:false,throwOnError:false});$
Triple point temperature	90.6941 K
Triple point pressure	0.01169 MPa

Range of validity

The MethaneFluidProperties UserObject is valid for:

90.69 K $var element = document.getElementById("moose-equation-f60f6e3c-0f1e-4c20-a4b9-8ff36fd72235");katex.render("\\le", element, {displayMode:false,throwOnError:false});$ T $var element = document.getElementById("moose-equation-11f3b606-07c3-48a6-afcd-37590399d0bb");katex.render("\\le", element, {displayMode:false,throwOnError:false});$ 625 K

and pressures up to 100 MPa.

Input Parameters

T_initial_guess400Temperature initial guess for Newton Method variable set conversion
Default:400
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Temperature initial guess for Newton Method variable set conversion
max_newton_its100Maximum number of Newton iterations for variable set conversions
Default:100
C++ Type:unsigned int
Controllable:No
Description:Maximum number of Newton iterations for variable set conversions
p_initial_guess200000Pressure initial guess for Newton Method variable set conversion
Default:200000
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Pressure initial guess for Newton Method variable set conversion
tolerance1e-08Tolerance for 2D Newton variable set conversion
Default:1e-08
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Tolerance for 2D Newton variable set conversion

Variable Set Conversions Newton Solve Parameters

allow_imperfect_jacobiansFalsetrue to allow unimplemented property derivative terms to be set to zero for the AD API
Default:False
C++ Type:bool
Controllable:No
Description:true to allow unimplemented property derivative terms to be set to zero for the AD API
control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:Yes
Description:Set the enabled status of the MooseObject.
fp_typesingle-phase-fpType of the fluid property object
Default:single-phase-fp
C++ Type:FPType
Controllable:No
Description:Type of the fluid property object

Advanced Parameters

prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Unit:(no unit assumed)
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.
Default:False
C++ Type:bool
Controllable:No
Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

Material Property Retrieval Parameters

References

IAPWS. Guidelines on the Henry's constant and vapour liquid distribution constant for gases in H$_2$O and D$_2$O at high temperatures. Technical Report, IAPWS, 2004.

@techreport{iapws2004,
    author = "IAPWS",
    title = "{Guidelines on the Henry's constant and vapour liquid distribution constant for gases in H$\_2$O and D$\_2$O at high temperatures}",
    institution = "IAPWS",
    year = "2004"
}

T. F. Irvine Jr and P. E. Liley. Steam and gas tables with computer equations. Academic Press Inc., Orlando, 1984.

@book{irvine1984,
    author = "Irvine Jr, T. F. and Liley, P. E.",
    title = "Steam and gas tables with computer equations",
    publisher = "Academic Press Inc.",
    address = "Orlando",
    year = "1984"
}

Ulrich Setzmann and Wolfgang Wagner. A new equation of state and tables of thermodynamic properties for methane covering the range from the melting line to 625 k at pressures up to 100 mpa. J. Phys. Chem. Ref. Data, 20(6):1061–1155, 1991.

@article{setzmann1991,
    author = "Setzmann, Ulrich and Wagner, Wolfgang",
    title = "A new equation of state and tables of thermodynamic properties for methane covering the range from the melting line to 625 K at pressures up to 100 MPa",
    journal = "J. Phys. Chem. Ref. Data",
    volume = "20",
    number = "6",
    pages = "1061--1155",
    year = "1991"
}

Properties of methane
Range of validity
Input Parameters
References