Particle Clusters In and Above Fluidized Beds
Based on fluidized bed experiments at varying fines concentration, bed heights and bed internals location, the dominant mechanism for clusters in the freeboard appears to be cluster formation in the bed.
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Particle Attrition Measurements Using a Jet Cup
This paper by Ray Cocco, S. B. Reddy Karri, Yeook Arrington, Roy Hays, John G. Findlay, and Ted Knowlton of PSRI discusses the simulation-informed development of a conical jet cup device that allows all of the sample particles to experience similar solids stresses.
The Effect of Cohesive Forces on Catalyst Entrainment in Fluidized Bed Regenerators
Clustering of particles in granular-fluid systems has been known to exist for some time. Wilhelm and Kwauk were among the first to show evidence of particle clustering in fluidized beds with others following suit with similar experiments.
Effects of imposed solids flux and pressure on gas bypassing in deep fluidized beds of Group A materials
Tests were conducted in 0.6-m and 0.9-m-diameter units to determine the effect of imposed solids flux and system pressure on gas bypassing in deep beds of FCC catalyst particles.
Effect of gas bypassing in deep beds on cyclone dipleg operation
Cyclone diplegs play a major role in the functioning of fluidized beds. Previous studies. This report discusses tests conducted to demonstrate that cyclone diplegs can flood when discharging into a bed with gas bypassing.
Three-Dimensional Simulation of Liquid Injection, Film Formation and Transport, in Fluidized Beds
This paper presents new capabilities and proof-testing of a collisional model previously presented in O’Rourke, Zhao, and Snider (2009) applied to liquid injection into a dense-phase fluidized bed.
Heterogeneous Gas Chemistry in the CPFD Eulerian–Lagrangian Numerical Scheme (Ozone Decomposition)
Researchers from CPFD and Cristal Global present a solution of ozone decomposition in a bubbling bed using the CPFD numerical scheme. Results compared well with the experimental data reported by Fryer and Potter (1976).
A Model for Collisional Exchange in Gas/Liquid/Solid Fluidized Beds
A new model is presented by O’Rourke, Zhao, and Snider for numerical simulations of collisional transfer of mass, momentum and energy in gas/liquid/solid fluidized beds.
Gas Distributor and Plenum Design in Fluidized Beds
The gas distributor (also called a grid) in a fluidized bed reactor is intended to induce a uniform and stable fluidization across the entire bed
cross-section, operate for long periods (years) without plugging or breaking, minimize weepage of solids into the plenum beneath the grid, minimize attrition of the bed material, and support the weight of the bed material during start-up and shut-down.
Pressure and Temperature Effects in Fluid-Particle Systems
Most investigations of fluidization parameters take place at ambi- ent temperature and pressure. Yet, nearly all processes operate at elevated temperature, and many at elevated pressure.