def diam_kolmogorov(EnergyDis, Temp, ConcAl, ConcClay, coag, material,
                    DIM_FRACTAL):
    """Return the size of the floc with separation distances equal to
    the Kolmogorov length and the inner viscous length scale.
    """
    return (material.Diameter
            * ((eta_kolmogorov(EnergyDis, Temp).magnitude / material.Diameter)
               * ((6 * frac_vol_floc_initial(ConcAl, ConcClay, coag, material))
                  / np.pi
                  )**(1/3)
               )**(3 / DIM_FRACTAL)
            )
Return the size of the floc with separation distances equal to
    the Kolmogorov length and the inner viscous length scale.