Numerical modeling of the hydrodynamics of gas fluidized beds
Thesis/Dissertation
·
OSTI ID:6967074
This research involves a numerical study of the hydrodynamics of gas fluidized beds. The continuum model is used, treating both gas and particles as interpenetrating continua. The motion of gas and particles is strongly coupled by the interactions between them. For simplicity, only drag forces are considered. The author used MacCormack's numerical method to solve the hyperbolic-like equations and the successive-error vector-propagation method or a marching tridiagonal method to solve the elliptic equation for pressure, depending on the situation considered (i.e., boundary conditions and geometry). In order to understand the basic phenomena, the propagation of a finite disturbance of sine-wave shape in one dimension is considered. The disturbance grows in amplitude and forms a voidage shock. Next, the two-dimensional case is analyzed, starting from the uniform fluidization conditions. Also considered is the two-dimensional case with a rectangular obstacle. The initial condition is calculated using D'Arcy's law. Particle packing on the top and the local-expansion phenomenon under the obstacle are observed, as well as the interaction of a rising bubble. These numerical results agree qualitatively with experimental observations reported by others.
- Research Organization:
- Oregon State Univ., Corvallis (USA)
- OSTI ID:
- 6967074
- Country of Publication:
- United States
- Language:
- English
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