Numerical simulation of the fluid dynamics of a freely bubbling fluidized bed: influence of the air supply system (original) (raw)
Ž. Numerical simulations, based on an Eulerian approach, of a freely bubbling fluidized bed BFB are performed where emphasis is put Ž. on the importance of the inlet boundary conditions influence of the pressure drop of the air distributor on the state of fluidization. The Ž numerical results are compared with local instantaneous pressure measurements and time-averaged measurements bed height, mean. particle concentration. The closure of the Eulerian model is treated as follows: the drift velocity is modelled with a binary dispersion Ž. coefficient, gas-phase continuous phase fluctuations are modelled with a modified two-equation k-e model, and particle-phase 1 1 Ž. discrete phase fluctuations are also described by a two-equation k-k model derived from the kinetic theory of granular flow 2 12 Ž. Ž. modified to account for the interstitial gas and a Langevin equation. The numerical computations of a bubbling fluidized bed predict qualitatively the experimental values, which shows that there is a coupling between the bed and the air supply system.
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