Particle distribution trends are identified in relation to impeller speed, liquid height, and number of radial flow impellers on a single shaft.
The influence of geometric parameters (e.g., tank dimensions, diameter and position of impeller, continuous phase height-to-tank diameter ratio and impeller-to-tank diameter ratio) on the droplet size of emulsions produced by membrane emulsification has been studied.
The energy efficiency of slurry height variation, impeller type and diameter, and solid movement speed has been investigated with six soil series stirred in a soil-water slurry.
The analysis provides a first order representation of the effects of scale, mass fill, impeller rotational speed, blade height and blade bevel angle on the torque.
A combination of experimental techniques is adopted in order to obtain the full characterization of an industrial digester stirred by multiple impellers, which is scaled-down following the geometrical similarity criterion, under various impeller speeds and three liquid heights.
Also visual measurements were performed to determine the cloud height and just suspended impeller speed.
All fermentations were carried out in MDT medium in a 20 L stainless steel tank bioreactor (Biolafite) equipped with a shaft with three Rushton impellers (four blades, diameter 100 mm, height 20 mm), 0.2 um gas filter, butyl septum and tubing for temperature regulation, gas inlet, gas outlet and medium removal/addition.
For the blade impellers, the dimensionless torque was found to be a function of the impeller Froude number and a dimensionless blade height.
The depth of the immersed impeller was approximately two third of the height of the molten metal from the bottom of the crucible and the speed of the stirrer maintained at 600 rpm.
This paper presents an experimental program performed to study the effects of flotation variables (i.e. feed grade, feed particle size, froth height, superficial gas velocity and impeller speed) on the froth rheology.
