Concentration profiles of solids suspended in a stirred tank

Scale-up criteria for the solids distribution in slurry reactors stirred with multiple impellers

“…In ba ed vessels relatively lower solids concentration gradients prevail on horizontal planes than in the vertical direction (Yamazaki et al, 1986;Barresi and Baldi, 1987;Bilek and Rieger, 1990;Mak and Ruszkowski, 1990; especially above the agitator. This feature is reinforced in multiple impeller systems which can, therefore, be e ectively characterised in terms of vertical solids concentration proÿles (Magelli et al, 1990;.…”

Solid particle distribution of moderately concentrated suspensions in a pilot plant stirred vessel

“…The significance of the radial concentration gradient has never been analysed in detail, even though the presence of radial concentration gradient depends on the stirrer type and speed as well as on impeller offbottom clearance, particle diameter and solid loading. Literature data suggest that generally, the radial concentration gradients are negligible [6,13,14,32,33]. However, this assumption cannot be generalised.…”

Experimental and computational fluid dynamics modeling of mixing by Visco-jet impellers

“…Re stands for the relative Reynolds number, which is defined as: (12) Eq. (10) incorporates additional forces (F i ) in the particle force balance that can be important under special circumstances.…”

“…A similar approach was used to simulate the solid-liquid flows generated by the Rushton turbine. The model predictions were compared with the experimental data of axial solid concentration profile reported by Yamazaki et al [12]. The model predictions were used to understand the interaction of the suspension quality and the liquid-phase mixing process.…”