Experimental investigations of stirred solid/liquid systems in three different scales: Particle distribution and power consumption

In this paper, experimental results of power consumption as well as phase distribution measurements in stirred solid/liquid systems are presented. The local dispersed phase volume fraction in three geometrically similar vessels with the diameters of 0.2, 0.4 and 0.9 m was investigated at up to 69 different local positions by means of an endoscope technique. The results are compared and show a good agreement between the different vessel sizes under comparable conditions. The power number was investigated and found to decrease remarkably with increasing mean solids concentrations.