Gh. Rong et al., SIMULATION OF FLOW BEHAVIOR OF BULK SOLIDS IN BINS .2. SHEAR BANDS, FLOW CORRECTIVE INSERTS AND VELOCITY PROFILES, Journal of agricultural engineering research, 62(4), 1995, pp. 257-269
Flow behaviour of idealized particles (discs) in parallel wall model b
ins of various shapes is simulated using the discrete element method.
The emphasis is on two distinct aspects: occurrence of shear bands and
use of flow corrective inserts. The results indicate that there exist
voids in the bulk mass and discontinuities in the velocity field of i
dealized bulk solids flowing out of bins. The localized failure modes
in the form of narrow layers are interpreted as shear bands characteri
zed by three mechanisms, viz., heterogeneity, intensive rotation and d
ilatancy. The results of parametric studies show that particle propert
ies and outlet size influence the formation and development of shear b
ands. Flow corrective insert placed at an optimum height can reduce st
agnant zones, stabilize discharge rate and enhance uniform flow. (C) 1
995 Silsoe Research Institute