mono-modal and has no shoulders. This would indicate sings of coalescence or flow bypassing he main turbulent region therefore it is hypothesised that there is minimal in-processing coalescence. An explanation for the decrease in droplet size with passes thus lies in the timescales of droplet break-up. The time required to create droplet deformation and break-up must be similar to the residence time of the stresses that create this droplet deformation therefore multiple passes are required.