def R (Rmin, beta):
    """
    Calculates the actual reflux number.
    Parameters
    ----------
    R_min : float
        The minimal reglux number, [dismensionless]
    beta : float
        The overflow of reflux, [dismensionless]    
    Returns
    -------
    R : float
        The actual reflux number, [dismensionless]
    References
    ----------
    Романков, стр.321, формула 7.11
    """         
    return Rmin * beta