99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/**
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* @file TortuosityBase.cpp
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* Base class to compute the increase in diffusive path length associated with
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* tortuous path diffusion through, for example, porous media.
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*/
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/*
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* Copyright (2005) Sandia Corporation. Under the terms of
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* Contract DE-AC04-94AL85000 with Sandia Corporation, the
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* U.S. Government retains certain rights in this software.
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*/
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#include "TortuosityBruggeman.h"
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#include "cantera/base/ctexceptions.h"
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#include <string>
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namespace Cantera
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{
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//====================================================================================================================
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// Default constructor
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TortuosityBruggeman::TortuosityBruggeman(doublereal setPower) :
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TortuosityBase(),
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expBrug_(setPower)
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{
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}
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//====================================================================================================================
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// Copy Constructor
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/*
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* @param right Object to be copied
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*/
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TortuosityBruggeman::TortuosityBruggeman(const TortuosityBruggeman& right) :
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TortuosityBase(),
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expBrug_(right.expBrug_)
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{
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*this = right;
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}
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//====================================================================================================================
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// Default destructor for TortuosityBruggeman
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TortuosityBruggeman::~TortuosityBruggeman()
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{
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}
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//====================================================================================================================
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// Assignment operator
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/*
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* @param right Object to be copied
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*/
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TortuosityBruggeman& TortuosityBruggeman::operator=(const TortuosityBruggeman& right)
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{
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if (&right == this) {
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return *this;
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}
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TortuosityBase::operator=(right);
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expBrug_ = right.expBrug_;
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return *this;
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}
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//====================================================================================================================
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// Duplication operator
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/*
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* @return Returns a pointer to a duplicate of the current object given a
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* base class pointer
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*/
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TortuosityBase* TortuosityBruggeman::duplMyselfAsTortuosityBase() const
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{
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return new TortuosityBruggeman(*this);
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}
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//====================================================================================================================
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// The tortuosity factor models the effective increase in the diffusive transport length.
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/*
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* This method returns \f$ 1/\tau^2 \f$ in the description of the flux
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*
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* \f$ C_T D_i \nabla X_i / \tau^2 \f$.
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*
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*
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*/
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doublereal TortuosityBruggeman::tortuosityFactor(doublereal porosity)
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{
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return pow(porosity, expBrug_ - 1.0);
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}
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//====================================================================================================================
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// The McMillan number is the ratio of the flux-like variable to the value it would have without porous flow.
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/*
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* The McMillan number combines the effect of tortuosity
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* and volume fraction of the transported phase. The net flux
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* observed is then the product of the McMillan number and the
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* non-porous transport rate. For a conductivity in a non-porous
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* media, \f$ \kappa_0 \f$, the conductivity in the porous media
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* would be \f$ \kappa = (\rm McMillan) \kappa_0 \f$.
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*/
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doublereal TortuosityBruggeman::McMillanFactor(doublereal porosity)
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{
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return pow(porosity, expBrug_);
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}
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//====================================================================================================================
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}
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