KochFriedlander.H

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Class
    Foam::sinteringModels::KochFriedlander
 
Description
    Sintering model of Koch and Friedlander (1990). The characteristic time for
    sintering is given by
 
    \f[
        \tau = c_s d_{p_i}^n T^m \exp(T_a/T \cdot [1 - d_{p,min}/d_{p_i}])\;.
    \f]
 
    Note that the correction factor in the exponential function can be
    eliminated by setting \f$d_{p,min}\f$ to zero which is done by default.
 
    Reference:
    \verbatim
        Koch, W., & Friedlander, S. K. (1990).
        The effect of particle coalescence on the surface area of a coagulating
        aerosol.
        Journal of Colloid and Interface Science, 140(2), 419-427.
    \endverbatim
 
Usage
    \table
        Property | Description                | Required    | Default value
        Cs       | Sintering time coefficient | yes         | none
        n        | Particle diameter exponent | yes         | none
        m        | Temperature exponent       | yes         | none
        Ta       | Activation temperature     | yes         | none
        dpMin    | Minimum primary particle diameter | no   | 0
    \endtable
 
SourceFiles
    KochFriedlander.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef KochFriedlander_H
#define KochFriedlander_H
 
#include "sinteringModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace diameterModels
{
namespace shapeModels
{
namespace sinteringModels
{
 
/*---------------------------------------------------------------------------*\
                       Class KochFriedlander Declaration
\*---------------------------------------------------------------------------*/
 
class KochFriedlander
:
    public sinteringModel
{
    // Private Data
 
        //- Subdictionary containing model coefficients
        const dictionary& dict_;
 
        //- Sintering time coefficient
        scalar Cs_;
 
        //- Sintering time primary particle diameter exponent
        scalar n_;
 
        //- Sintering time temperature exponent
        scalar m_;
 
        //- Activation temperature
        scalar Ta_;
 
        //- Minimum primary particle diameter, defaults to Zero
        scalar dpMin_;
 
 
public:
 
    //- Runtime type information
    TypeName("KochFriedlander");
 
 
    // Constructors
 
        //- Construct from a dictionary and a fractal shape model
        KochFriedlander
        (
            const dictionary& dict,
            const fractal& fractalShape
        );
 
 
    //- Destructor
    virtual ~KochFriedlander();
 
 
    // Member Functions
 
        //- Characteristic time for sintering
        virtual tmp<volScalarField::Internal> tau() const;
 
        //- Sintering source term
        virtual tmp<fvScalarMatrix> R() const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace sinteringModels
} // End namespace shapeModels
} // End namespace diameterModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //