def mass_transfer_coefficient_HNS(Sh, Dc, diameter):
    """
    return the mass transfer coefficent [m/s]
    source : (HNS-MS)

    Parameters
    ----------
    Sh : Average sherwood number []
    Dc : Diffusion coefficient at 25 °C[m²/s]
    diameter : Diameter of the slick or the droplet [m]

    """
    return (Sh*Dc) / diameter