HerschelBulkley.H

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Class
    Foam::mixtureViscosityModels::HerschelBulkley
 
Description
    HerschelBulkley viscosity model
 
    The Herschel-Bulkley model combines the effects of a Bingham plastic
    and power-law behaviour of a fluid. At a low strain rate \f$\gamma\f$
    the fluid adopts a viscosity \f$\mu_0\f$. Beyond a threshold stress
    \f$\tau_0\f$, the viscosity is described as a power law.
 
    Kinematic viscosity [m^2/s]
 
    \f[
        \mu = \min(\mu_0, (\tau_0 + k\gamma^{n})/\gamma)
    \f]
 
Usage
    Example usage:
    \verbatim
        viscosityModel HerschelBulkley;
 
        rho        1996; // Dispersed phase density
 
        tau0       10.0;
        k          0.001;
        n          0.2;
    \endverbatim
 
SourceFiles
    HerschelBulkley.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef HerschelBulkley_H
#define HerschelBulkley_H
 
#include "mixtureViscosityModel.H"
#include "dimensionedScalar.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace mixtureViscosityModels
{
 
/*---------------------------------------------------------------------------*\
                           Class HerschelBulkley Declaration
\*---------------------------------------------------------------------------*/
 
class HerschelBulkley
:
    public mixtureViscosityModel
{
    // Private data
 
        dimensionedScalar n_;
        dimensionedScalar k_;
        dimensionedScalar tau0_;
 
 
public:
 
    //- Runtime type information
    TypeName("HerschelBulkley");
 
 
    // Constructors
 
        //- Construct from mixture
        HerschelBulkley(const incompressibleDriftFluxMixture& mixture);
 
 
    //- Destructor
    virtual ~HerschelBulkley()
    {}
 
 
    // Member Functions
 
        //- Return the mixture viscosity
        //  given the viscosity of the continuous phase
        virtual tmp<volScalarField> mu
        (
            const volScalarField& muc,
            const volVectorField& U
        ) const;
 
        //- Read phaseProperties dictionary
        virtual bool read();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace mixtureViscosityModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //