Simulation of Flow Behaviour of Bulk Solids in Bins. Part 2: Shear Bands, Flow Corrective Inserts and Velocity Profiles

Model for the deformation in agricultural and food particulate materials under bulk compressive loading using discrete element method. II: Compression of oilseeds

“…This is because the detection and evaluation of the behaviour of these particles, dynamically calculated in DEM for large number of particles require enormous computational time and cost. However the predicted particle movement, shear band and other bulk and individual particle behavioural parameters generally reportedly predicted for representative samples have been found to be in reasonable agreement with measured and observed values (Barthurst & Rothenburg, 1986;Langston, Nikitidis, Tuzun, Heye, & Spyrou, 1997;Rong, Negi, & Jofriet, 1995;Schembri & Harris, 1996).…”

“…For example the DEM has been widely applied to the flow analysis and bulk deformation of powder granules and agglomerates, soil and rock particles (Cundall, 1971;D'Addetta, Kun, Ramm, & Herrmann, 2001;Lin, Wei, Iwai, Hong, & Greil, 2000;Ng & Dobry, 1994;Ning, Boerefijn, Ghadiri, & Thornton, 1997) as well as grain flow in storage bins (Negi, Lu, & Jofriet, 1997;Rong et al, 1995). However recent studies have shown its use for soft or low modulus materials exhibiting large strain on loading i.e.…”

Model for the deformation in agricultural and food particulate materials under bulk compressive loading using discrete element method. I: Theory, model development and validation

“…For example Hryciw, Raschke, Ghalib, Horner, and Peters (1997) used approximately 66,000 particles in their study of soil ploughing with the bulk volume of the model sand particles being approximately 1 · 10 4 mm 3 . The same applies in the modelling of gravity flow in silos by Rong et al (1995) and Sakaguchi et al (1994) where a few hundreds of particles were used to represent a large silo. The strength properties of the particles used in the simulation by Hryciw et al (1997) and Langston, Nikitidis, Tuzun, Heye, and Spyrou (1997) were also adjusted to between 4 and 8 orders of magnitude less than the real values.…”

“…However its application to agricultural and food particulates has been more limited. Previous studies in the field include impact damage of fruit during transport (Raji & Favier, 2002;Rong, Negi, & Jofriet, 1993), grain flow (Holst, Rotter, Ooi, & Rong, 1999;Rong et al, 1995), grain shaking and separation (Sakaguchi, Kawakami, Suzuki, Urukawa, & Favier, 1998;Tanida et al, 1998) and the effect of impact on a sugar cane stem (Schembri & Harris, 1996).…”

“…Agricultural and food materials tend to behave as viscoelastic materials when they are subjected to various conditions of stress and strain (Mohsenin, 1986;Rong, Negi, & Jofriet, 1995;Sakaguchi, Kawakami, & Tobita, 1994;Tsuji, Tanaka, & Ishida, 1992). The resulting mechanical behaviour of an assembly of the viscoelastic agricultural particulates such as fruit, seeds and flour is a complex integrated effect defined by the geometry of the particles, the shape and surface roughness of the containing structure, number and strength of the points of interaction of the objects (contacts).…”