def alpha_coolwater_dist(Nu_dist, lyambda_coolwater_dist, d_outer_dist):
    """
    Calculates the coefficent of heat transfer(alpha) from liquid to wall of pipe.
    Parameters
    ----------
    Nu_dist : float
        The Nusselt criterion, [dimensionless]
    lyambda_coolwater_dist : float
        The thermal conductivity of coolwater, [W / (m * degreec celcium)]
    d_outer : float
        The diametr of outer pipe, [m]
    Returns
    -------
    alpha_coolwater_dist : float
        The coefficent of heat transfer(alpha), [W / (m**2 * degrees celcium)]
    References
    ----------
    Романков, формула 4.11, стр.150
    """          
    return Nu_dist * lyambda_coolwater_dist / d_outer_dist