The Effect of Rotational Speed on Granular Flow in a Vertical Bladed Mixer

0451672 - ÚCHP 2016 RIV NL eng J - Článek v odborném periodiku
Havlica, Jaromír - Jirounková, K. - Trávníčková, Tereza - Kohout, M.
The Effect of Rotational Speed on Granular Flow in a Vertical Bladed Mixer.
Powder Technology. Roč. 280, AUG (2015), s. 180-190. ISSN 0032-5910. E-ISSN 1873-328X
Grant CEP: GA ČR(CZ) GAP105/12/0664
Institucionální podpora: RVO:67985858
Klíčová slova: DEM * granular mixing * granular dynamics
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
Impakt faktor: 2.759, rok: 2015

Granular mixing is an important unit operation used to ensure the uniformity of mixture properties. Unfortunately, the mechanisms of particles' motion and the role of operation parameters remain poorly understood. In this work, granular mixing is studied using computer simulations via discrete element method. The examined process is the mixing of approximately 42 thousand glass spherical particles with a 2 mm diameter in a vertical cylindrical mixer with two opposed flat blades with a 45° rake angle. The effect of different blade rotational speeds (varying from 0.1 rpm to 960 rpm) on the formation and evolution of flow patterns is investigated. Examining individual particle trajectories shows that the particles exhibit two basic types of periodic movements. The first one, characterized by a higher frequency, is related to the motion of the stirrer. The second one (lower frequency) is associated with recirculations in the vertical plane. A methodology for their detection is proposed.
Trvalý link: http://hdl.handle.net/11104/0252804