Discrete Element Method (DEM) Analysis of Non-Cohesive Granular Material Flow in Hoppers

Hoppers, silos and bins are expected to store material and provide unrestricted and uniform flow of the same in mate-rial processing plants. Traditionally, the material flow from hopper is analyzed assuming the solid mass as contin-uum. However, the behavior of particulate solids deviates significantly from a continuous system, due to fluctuation in its bulk material properties (e.g. bulk density) throu-ghout the process. In the present work, a numerical techn-ique called discrete element method (DEM) is used to analyze granular material flow from hopper. DEM tracks the _trajectories of individual particles as they interact with their neighboring particles and hopper walls. These interactions ultimately translate to the overall displace-ment of the particles. The scheme is repeated in small time intervals covering the complete duration of the proc-ess. Here the simulations are limited to non-cohesive sphe-rical granular material. Material flow is studied as a function of hopper geometry. This article involves visua-lization and flow rate analysis of coarse particles for different hopper design.

[1]  Aibing Yu,et al.  Microdynamic analysis of the particle flow in a cylindrical bladed mixer , 2004 .

[2]  Amlan Datta,et al.  Discrete element analysis of tumbling mills , 2000 .

[3]  N. Djordjevic.  Influence of charge size distribution on net-power draw of tumbling mill based on DEM modelling , 2005 .

[4]  J. van de Velde,et al.  The flow of granular solids through orifices , 1961 .

[5]  Paul W. Cleary,et al.  Predicting charge motion, power draw, segregation and wear in ball mills using discrete element methods , 1998 .

[6]  P. Cundall,et al.  A discrete numerical model for granular assemblies , 1979 .

[7]  R. T. Fowler,et al.  The flow of granular solids through orifices , 1959 .

[8]  A. W. Jenike,et al.  STORAGE AND FLOW OF SOLIDS :(REV. 1980. ) , 1980 .

[9]  P. A. Langston,et al.  Distinct element simulation of interstitial air effects in axially symmetric granular flows in hoppers , 1996 .

[10]  Yutaka Tsuji,et al.  Numerical simulation of two-dimensional fluidized beds using the discrete element method (comparison between the two- and three-dimensional models) , 1998 .

[11]  Brahmeshwar Mishra,et al.  The discrete element method for the simulation of ball mills , 1992 .

[12]  Paul Langston,et al.  Distinct element modelling of non-spherical frictionless particle flow , 2004 .

[13]  Guy T. Houlsby,et al.  The flow of granular materials—I: Discharge rates from hoppers , 1982 .

[14]  R. M. Nedderman,et al.  The discharge of fine sands from conical hoppers , 1995 .

[15]  Tom Dyakowski,et al.  Flow of sphero-disc particles in rectangular hoppers - A DEM and experimental comparison in 3D , 2004 .