(33a) Importance of Cohesion Strength Measurements As Flowability Indicator of Powders in a Fluidized Bed
World Congress on Particle Technology
8th World Congress on Particle Technology
Fluidization & Multiphase Flow
Measurement Techniques in Fluid-Particle Systems
Monday, April 23, 2018 - 3:30pm to 3:48pm
Cohesion strength is determined via shearing the sample following a protocol where the sample is compressed at low consolidations with an air-permeable piston and then a spoke-shaped geometry penetrates the sample and shears it. Warren Spring cohesion is calculated as the maximum value.
Furthermore comparisons on shear rate dependent viscosity and Brookfield Powder Flow Tester (using annular shear cell) contribute to the calculations which determine the flowability of the powders and allow the characterization of harsh cohesive powders.
 Valverde J.M., Castellanos A. Effect of particle size and interparticle force on the fluidization behaviour of gas fluidized beds. Phys. Rev. E 67, 051305 (2003)
 Rietema, K The dynamics of fine powders, Elsevier, London (1991)
 Salehi H, Schutz D, Romirer R, Barletta D, Poletto M. On the use of a powder rheometer to characterize the powder flowability at low consolidation with torque resistances. AIChE Journal http://dx.doi.org/10.1002/aic.15934