Maximum spoutable bed height of spout-fluid bed

CFD Analysis of Hydrodynamic Studies of a Bubbling Fluidized Bed

“…They found that, the most extreme spoutable bed structure of spout-liquid bed dimensions, with increasing particle size and gas spout size. Lettieri et al [13] simulated the changeover of bubbling to slugging regime for a typical Group B material at four fluidizing velocities. The simulations are carried with the Eulerian-Eulerian granular kinetic version available inside the CFX-four code.…”

Study of Parameters Effect on Hydrodynamics of a Gas-Solid Chamber Experimentally and Numerically

“…Several drag models exist for the gas-solid inter phase exchange coefficient gs E . In this research Syamlal-O'Brien drag model was used [17,18]. The drag law of Syamlal-O'Brien is based on the measurements of the terminal velocities of particles in fluidized or settling beds.…”

“…Their results shown that the maximum spoutable bed height of spout-fluid bed decreases with increasing particle size and spout nozzle size, which appears the same trend to that of spouted beds. Lettieri et al [17] used the Eulerian-Eulerian granular kinetic model available within the CFX-4 code to simulate the transition from bubbling to slugging fluidization for a typical Group B material at four fluidizing velocities. Results from simulations were analysed in terms of voidage profiles and bubble size, which showed typical features of a slugging bed, and also good agreement between the simulated and predicted transition velocity.…”

Study of Heat Transfer and Hydrodynamics in the Fluidized Bed Reactors

“…The standard k ε − model is a semi-empirical model based on model transport equations for the turbulence kinetic energy (k) and its dissipation rate ( ε ). The model transport equation for k is derived from the exact equation, while the model transport equation for ε was obtained using physical reasoning and bears little resemblance to its mathematically exact counterpart [30][31][32][33][34]. The Reynolds stress tensor for the gas phase is ,, The turbulence kinetic energy, k, and its rate of dissipation, ε , are obtained from the following transport equations (modified k ε − model):…”

“…al. [30,31] studied the maximum spoutable bed heights of a spout-fluid bed packed with six kinds of Geldart group D particles were. They obtained the effects of particle size, spout nozzle size and fluidizing gas flow rate on the maximum spoutable bed height.…”