Scaling up of dispersion processes

In the material system (0.5 octane+ 0.5 CCI4 0.8 anisole+ 0.2 CCI4 chloro-benzene/water (p = 0.05) a steady-state condition had still not been achieved after 30 min [392]. In the material system trichloroethane/water = 0.2) it took 2 h [166]. 

Finally the studies [314, 392] should be mentioned, which also deal with the effect of mixing time on the droplet size distribution. Logarithmic cumulative volume distributions were presented as a function of droplet volume for different mixing times, was made so small, that the mixing time only caused parallel shifts of the distribution curves (without changing the slope) this confirmed, that the disintegration process did not change with time. 

In dispersing of L/L systems, the same power characteristics apply as with mixing in homogeneous material systems, if for the liquid density the average density of the dispersion 

From this the following scaling up rule for the stirrer speed is obtained  

If in the scale-up criterion the expression is replaced by the equivalent expression for the turbulent flow range, P/pV, the following expression is obtained 

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