def guggenheim_katayama(phase, K2, n,
                        pore_T='pore.temperature',
                        pore_Tc='pore.critical_temperature',
                        pore_Pc='pore.critical_pressure',
                        **kwargs):
    r"""
    Missing description

    Parameters
    ----------
    K2 : scalar
        Fluid specific constant

    n : scalar
        Fluid specific constant

    pore_T : string
        The dictionary key containing the temperature values (K)

    pore_Tc : string
        The dictionary key containing the critical temperature values (K)

    pore_Pc : string
        The dictionary key containing the critical pressure values (K)

    TODO: Needs description
    """
    T = phase[pore_T]
    Pc = phase[pore_Pc]
    Tc = phase[pore_Tc]
    sigma_o = K2*Tc**(1/3)*Pc**(2/3)
    value = sigma_o*(1-T/Tc)**n
    return value
dataset/ETHPy150Open PMEAL/OpenPNM/OpenPNM/Phases/models/surface_tension.py/guggenheim_katayama/original