Relaxation auto-oscillations in a fluidized bed
V.G. Tuponogov1, A.F. Ryzhkov2, A.P. Baskakov3, O.A. Obozhin4
1 Ural State Technical University, Ekaterinburg, Russia, tuponogov@mail.ustu.ru
2 Ural State Technical University, Ekaterinburg, Russia
3 Ural State Technical University, Ekaterinburg, Russia
4 Ural State Technical University, Ekaterinburg, Russia
Keywords: gas slugs, surface velocity, cavity on the surface, annular particle streak, voidage variation, Ergun equation, cycle of oscillations
Pages: 643-657
Abstract
Oscillations of nonuniform fluidized bed in the slugging regime are considered. A nonlinear one-dimensional model of bed oscillations is developed and investigated, including the equations of the bed surface motion and the oscillations of the pressure drop in the bed for the phase of the surface ascent and for the phase of its fall. A quasi-discrete process of the gas escape from the layer with large bubble and the relaxation (discontinuous) type of oscillations of the bed surface and of the pressure, which are related to the above process, are shown based on the model analysis, the obtained numerical solutions, and the comparison with experiment.
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