Various approaches to structure gas-solid fluidized beds are reviewed, followed by detailed discussion on the use of gas pulsation induce dynamic structuring. Granular media dissipative systems, which develop complex spatiotemporal patterns when excited an oscillating energy source. Here, we discuss how such perturbations initiate surface and these could propagate into a macroscopically organiz...

Particles distributions along a conical fluidized bed were predicted by an alternative arrangement of the minimum fluidization velocity equation. The proposed approach introduces two new equations which present the particle diameter in the bed as function of: height in the bed (Z), angle of inclination of the fluidized bed wall (θ), input flow rate (Qo), and gas distributor diameter (Do, 2ro). ...

This work presents a computational study of flow behaviour in a bubbling fluidized bed polymerization reactor. The model is developed by using the commercial CFD code Fluent 6.3. The model is based on an Eulerian description of the gas and the particle phase. The effect of distributor shape on fluidization is analyzed using the inbuilt Gidaspow and Syamlal-O’brien Drag Model. The computational ...

Abstract According to the characteristics of marine natural gas hydrate, China has proposed solid-state fluidization exploitation technology or with subsea being key commercial recovery gas. In this paper, two new integrated tools are for breaking and collecting their working principles steps illustrated. Finite element analysis, three-dimensional modeling, simulations were conducted both verif...

In the computational fluid dynamics (CFD) modeling of gas-solids two phase flow, the effect of boundary conditions play an important role in predicting the hydrodynamic characteristics of fluidized beds. In this work, the hydrodynamics of conical fluidized bed containing dried TiO2 nano-agglomerates were studied both experimentally and computationally. The pressure drop ...

Gas–liquid-solid fluidized beds are broadly utilized in the petrochemical, pharmaceutical, refining, food, biotechnology, and environmental industries. Due to complex phenomena, such as particle-particle, liquid-particle, particle-bubble interactions, hydrodynamics, heat transfer of three-phase (gas-liquid-solid) beds, they incompletely understood. The ability accurately predict essential chara...

-The floating gas-solid fluidized bed (FGSFB) is a new type of gas-solid contacting device described earlier by Kwant et al. (Fluidization VII, Proc. 7th En#ng Found. Conf. on Fluidization, Brisbane, May, 1992). It is a tapered column provided with several coarse grids, in which catalyst particles are fluidized by a gas at a velocity decreasing with height from a value larger than the single pa...

Article history: Received 2 August 2017 Received in revised form 29 October 2017 Accepted 13 November 2017 Available online 21 November 2017 Many important engineering applications involve the interaction of free-moving objects with dispersed multiphase flows, however due to the challenge and complexity ofmodelling these systems,modelling approaches remain very limited and very few studies have...