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https://develop.openfoam.com/Development/openfoam.git
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143 lines
4.0 KiB
C++
143 lines
4.0 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Class
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Foam::APIdiffCoefFunc
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Description
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API function for vapour mass diffusivity
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Source:
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@verbatim
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API (American Petroleum Institute)
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Technical Data Book
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@endverbatim
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\*---------------------------------------------------------------------------*/
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#ifndef APIdiffCoefFunc_H
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#define APIdiffCoefFunc_H
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#include "thermophysicalFunction.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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/*---------------------------------------------------------------------------*\
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Class APIdiffCoefFunc Declaration
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\*---------------------------------------------------------------------------*/
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class APIdiffCoefFunc
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:
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public thermophysicalFunction
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{
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// Private data
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// API vapour mass diffusivity function coefficients
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scalar a_, b_, wf_, wa_;
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// Helper variables
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scalar alpha_, beta_;
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public:
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//- Runtime type information
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TypeName("APIdiffCoefFunc");
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// Constructors
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//- Construct from components
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APIdiffCoefFunc(scalar a, scalar b, scalar wf, scalar wa)
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:
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a_(a),
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b_(b),
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wf_(wf),
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wa_(wa),
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alpha_(sqrt(1/wf_ + 1/wa_)),
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beta_(sqr((cbrt(a_) + cbrt(b_))))
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{}
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//- Construct from Istream
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APIdiffCoefFunc(Istream& is)
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:
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a_(readScalar(is)),
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b_(readScalar(is)),
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wf_(readScalar(is)),
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wa_(readScalar(is)),
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alpha_(sqrt(1/wf_ + 1/wa_)),
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beta_(sqr((cbrt(a_) + cbrt(b_))))
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{}
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// Member Functions
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//- API vapour mass diffusivity function using properties from
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// construction
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scalar f(scalar p, scalar T) const
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{
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return 3.6059e-3*(pow(1.8*T, 1.75))*alpha_/(p*beta_);
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}
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//- API vapour mass diffusivity function using properties from
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// construction - with specified binary pair
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scalar f(scalar p, scalar T, scalar Wa) const
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{
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const scalar alphaBinary = sqrt(1/wf_ + 1/Wa);
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return 3.6059e-3*(pow(1.8*T, 1.75))*alphaBinary/(p*beta_);
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}
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//- Write the function coefficients
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void writeData(Ostream& os) const
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{
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os << a_ << token::SPACE
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<< b_ << token::SPACE
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<< wf_ << token::SPACE
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<< wa_;
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}
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// Ostream Operator
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friend Ostream& operator<<(Ostream& os, const APIdiffCoefFunc& f)
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{
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f.writeData(os);
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return os;
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}
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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