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Two-phase flow of interstitial air in a moving packed bed of granular solids is modelled using a distinct element (DE) technique which considers the Newtonian dynamics of particle motion passing through a radial flow field of air in a mass flow hopper. The air flow is assumed to be incompressible and the mass flux of air at any height within the hopper is assumed to be constant. These assumptions allow the simulation of air-retarded and air-assisted flows in mass flow hoppers without the need for an extensive development of the momentum balance calculations on an Eulerian fixed grid. The particle particle and particle-hopper wall interactions are modelled using a Hertzian interaction law and a contact friction algorithm of the Mindlin analytic form (Langston et al., 1995, Chem. Engn 9 Sci. 50, 967). Predictions of discharge rates in both air-retarded and air-assisted flows are compared with the continuum mechanics calculations based on the steady-state flow assumption. The DE simulation results indicate certain transient and oscillatory features of the flow fields which have not hitherto been demonstrated by the continuum theories. Furthermore, it is shown that air-assisted flow le

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Author

P.A. Langston; U. Tüzün; D.M. Heyes

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0009-2509)

Published

1996

Language

EN

Field

Engineering (Physical Sciences)