Fundamental particle mixing studies in an agitated bed of granular materials in a cylindrical vessel

Motion in a particle bed agitated by a single blade

“…Ž . Malhotra et al 1988 investigated radial agitation in a cylindrical mixer of diameter 250 mm and of length 150 mm that was stirred by a single paddle. The ratio of the blade height to the bed height was 2, corresponding to a level of fill of about 30%, and the blade speed was 8 rpm.…”

Microdynamic analysis of the particle flow in a cylindrical bladed mixer

“…Research at a particle scale has been recognised as a promising approach to overcome this di culty. In the past, such studies have to be made by bed freezing and dissection which is very laborious and su ers a great deal of uncertainty (Bridgwater and Bagster, 1968;Novosad, 1968;Bagster and Bridgwater, 1969;Malhotra et al, 1988). Recent studies in this area are mainly based on the newly developed advanced experimental or numerical techniques among which the so-called positron emission particle tracking (PEPT) Bridgwater et al, 1993) and discrete element method (DEM) (Cundall and Strack, 1979) are probably most representative.…”

Using the discrete element method to assess the mixing of polydisperse solid particles in a rotary drum

“…The mixing quality inside the rotary blender was a function of the rotational velocity, particle sizes, powder composition, flow-induced dilation of cohesive granular powders, and geometrical parameters of the mixer. Some studies have shown that the mixing quality in rotary drum blenders can be improved using internal blades or baffles (Jiang et al, 2011;Malhotra, Mujumdar, Imakoma, & Okazaki, 1988;Malhotra, Mujumdar, & Okazaki, 1990). Khakhar, McCarthy, Shinbrot, and Ottino (1997) analyzed the mixing of monodisperse particles in a rotating cylinder to explore the role of flow on the dynamics of the mixing process at rotational speeds ranging 5.0-20 rpm.…”