/usr/include/freefoam/thermophysicalFunctions/APIdiffCoefFunc.H is in libfreefoam-dev 0.1.0+dfsg-1build1.
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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
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under the terms of the GNU General Public License as published by
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Class
Foam::APIdiffCoefFunc
Description
API function for vapour mass diffusivity
Source:
@verbatim
API (American Petroleum Institute)
Technical Data Book
@endverbatim
\*---------------------------------------------------------------------------*/
#ifndef APIdiffCoefFunc_H
#define APIdiffCoefFunc_H
#include <thermophysicalFunctions/thermophysicalFunction.H>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class APIdiffCoefFunc Declaration
\*---------------------------------------------------------------------------*/
class APIdiffCoefFunc
:
public thermophysicalFunction
{
// Private data
// API vapour mass diffusivity function coefficients
scalar a_, b_, wf_, wa_;
// Helper variables
scalar alpha_, beta_;
public:
//- Runtime type information
TypeName("APIdiffCoefFunc");
// Constructors
//- Construct from components
APIdiffCoefFunc(scalar a, scalar b, scalar wf, scalar wa)
:
a_(a),
b_(b),
wf_(wf),
wa_(wa),
alpha_(sqrt(1/wf_ + 1/wa_)),
beta_(sqr(cbrt(a_) + cbrt(b_)))
{}
//- Construct from Istream
APIdiffCoefFunc(Istream& is)
:
a_(readScalar(is)),
b_(readScalar(is)),
wf_(readScalar(is)),
wa_(readScalar(is)),
alpha_(sqrt(1/wf_ + 1/wa_)),
beta_(sqr((cbrt(a_) + cbrt(b_))))
{}
// Member Functions
//- API vapour mass diffusivity function using properties from
// construction
scalar f(scalar p, scalar T) const
{
return 3.6059e-3*(pow(1.8*T, 1.75))*alpha_/(p*beta_);
}
//- API vapour mass diffusivity function using properties from
// construction - with specified binary pair
scalar f(scalar p, scalar T, scalar Wa) const
{
const scalar alphaBinary = sqrt(1/wf_ + 1/Wa);
return 3.6059e-3*(pow(1.8*T, 1.75))*alphaBinary/(p*beta_);
}
//- Write the function coefficients
void writeData(Ostream& os) const
{
os << a_ << token::SPACE
<< b_ << token::SPACE
<< wf_ << token::SPACE
<< wa_;
}
// Ostream Operator
friend Ostream& operator<<(Ostream& os, const APIdiffCoefFunc& f)
{
f.writeData(os);
return os;
}
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************ vim: set sw=4 sts=4 et: ************************ //
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