Comparison of turbulence parametrisation for different eddy size parameter sizes. Top: critical eddy size l_crit (blue) for cloud particles in the T_eff = 1400 K, log₁₀(ɡ [cms⁻²]) = 3.0 profile, without inclusion of collisions. The red lines show the maximum eddy size (solid) and the Kolmogorov scale (dashed). The mean free path (l_mfp) of the gas is shown as the orange dashed line. Bottom: relative velocities that cloud particles would receive from turbulent eddies of the sizes l_edd in the upper panel (blue). The fragmentation limits discussed in Sect. 3.4.2 are shown as black lines. The magenta dashed lines show the maximum relative velocity using the Shakura & Sunyaev (1976) turbulence α parametrisation, and maximum velocity from Ormel & Cuzzi (2007). The lowest line is α = 10⁻⁸ and the highest is a = 1, increments in orders of magnitude.