Maximum stable drop size as a function of impeller tip speed u
for all impellers as indicated in the legend (impeller geometries according to Table 2). Lines indicate power law fit for different scales: solid: 50 L scale, dashed: 3 m3 scale, small dashed: 40 m3 scale. Dispersion of paraffin oil in 1 mM PO4-buffer at pH 7.3. Maximum stable drop size measured after 3 h agitation. Aeration rates in all measurements 0.7 vvm.