h2o_air.hh

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#ifndef DUMUX_BINARY_COEFF_H2O_AIR_HH
#define DUMUX_BINARY_COEFF_H2O_AIR_HH
 
#include <cmath>
 
namespace Dumux {
namespace BinaryCoeff {

class H2O_Air
{
public:
    template <class Scalar>
    static Scalar henry(Scalar temperature)
    {
      using std::exp;
      Scalar r = (0.8942+1.47*exp(-0.04394*(temperature-273.15)))*1.E-10;
 
      return 1./r;
    }

    template <class Scalar>
    static Scalar gasDiffCoeff(Scalar temperature, Scalar pressure)
    {
        const Scalar Theta=1.8;
        const Scalar Daw=2.13e-5;  /* reference value */
        const Scalar pg0=1.e5;     /* reference pressure */
        const Scalar T0=273.15;    /* reference temperature */
        Scalar Dgaw;
 
        using std::pow;
        Dgaw=Daw*(pg0/pressure)*pow((temperature/T0),Theta);
 
        return Dgaw;
    }

    template <class Scalar>
    static Scalar liquidDiffCoeff(Scalar temperature, Scalar pressure)
    {
        const Scalar Texp = 273.15 + 25; // [K]
        const Scalar Dexp = 2.01e-9; // [m^2/s]
        return Dexp * temperature/Texp;
    }
};
 
} // end namespace BinaryCoeff
} // end namespace Dumux
 
#endif