1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | foam-extend: Open Source CFD
4 \\ / O peration | Version: 3.2
5 \\ / A nd | Web: http://www.foam-extend.org
6 \\/ M anipulation | For copyright notice see file Copyright
7 -------------------------------------------------------------------------------
9 This file is part of foam-extend.
11 foam-extend is free software: you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation, either version 3 of the License, or (at your
14 option) any later version.
16 foam-extend is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
28 API function for vapour mass diffusivity
32 API (American Petroleum Institute)
36 \*---------------------------------------------------------------------------*/
38 #ifndef APIdiffCoefFunc_H
39 #define APIdiffCoefFunc_H
41 #include "thermophysicalFunction.H"
43 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
48 /*---------------------------------------------------------------------------*\
49 Class APIdiffCoefFunc Declaration
50 \*---------------------------------------------------------------------------*/
54 public thermophysicalFunction
58 // API vapour mass diffusivity function coefficients
59 scalar a_, b_, wf_, wa_;
67 //- Runtime type information
68 TypeName("APIdiffCoefFunc");
73 //- Construct from components
74 APIdiffCoefFunc(scalar a, scalar b, scalar wf, scalar wa)
80 alpha_(sqrt(1/wf_ + 1/wa_)),
81 beta_(sqr(cbrt(a_) + cbrt(b_)))
84 //- Construct from Istream
85 APIdiffCoefFunc(Istream& is)
91 alpha_(sqrt(1/wf_ + 1/wa_)),
92 beta_(sqr((cbrt(a_) + cbrt(b_))))
98 //- API vapour mass diffusivity function using properties from
100 scalar f(scalar p, scalar T) const
102 return 3.6059e-3*(pow(1.8*T, 1.75))*alpha_/(p*beta_);
105 //- API vapour mass diffusivity function using properties from
106 // construction - with specified binary pair
107 scalar f(scalar p, scalar T, scalar Wa) const
109 const scalar alphaBinary = sqrt(1/wf_ + 1/Wa);
110 return 3.6059e-3*(pow(1.8*T, 1.75))*alphaBinary/(p*beta_);
113 //- Write the function coefficients
114 void writeData(Ostream& os) const
116 os << a_ << token::SPACE
117 << b_ << token::SPACE
118 << wf_ << token::SPACE
125 friend Ostream& operator<<(Ostream& os, const APIdiffCoefFunc& f)
133 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
135 } // End namespace Foam
137 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
141 // ************************************************************************* //