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src
thermophysicalModels
thermophysicalFunctions
APIfunctions
APIdiffCoefFunc
APIdiffCoefFunc.H
Go to the documentation of this file.
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/*---------------------------------------------------------------------------*\
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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) 1991-2010 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
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the Free Software Foundation, either version 3 of the License, or
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(at your 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, see <http://www.gnu.org/licenses/>.
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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 <
thermophysicalFunctions/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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// ************************ vim: set sw=4 sts=4 et: ************************ //