Decrease in the fluidization quality of fluidized beds containing binary mixtures of different catalyst particles

Hirano, Yuki; Kai, Takami; Tsutsui, Takeki; Nakazato, Tsutomu

doi:10.1016/j.ces.2013.03.057

Cited by 5 publications

(1 citation statement)

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“…The multiphase flow is essential in the work of many of industrial operations and processes, in which a close contact between the fluid and the solid particles. Therefore, the fluid-solid interaction plays a major role in unit processes, including, fluidization, catalytic cracking, sedimentation, particle classification, pharmaceutical, food processing, water treatments, chemical reactions, pneumatic conveying, crystallization, and so on (Matheson et al, 1949;Richardson & Zaki, 1954;Hartge & Werther, 1986;Bürger & Wendland, 2001;Hirano et al, 2013). The fluidization processes or fluidized beds are a typical example of fluid-solid particle interaction; therefore, the fluidized beds are suited for chemical reactions as they allow exchanging the hydrodynamic and mechanic energies between the fluid and the solid particles.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the interactions between fluid and solid particles

Al-Arkawazi

2018

Journal of Garmian University

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This study focuses on analyzing and modeling the interactions between fluid and solid particles. A model based on the detection of contacts in granular medium is developed from a Discrete Elements approach (DEM) for solid phase, coupled with a Computational Fluid Dynamics (CFD) for fluid phase. The objective of this work is to investigate the interactions occurs between the fluid and solid particles in fluidized beds, and to better understand the various characteristic of these interactions which is the base of work of unit operations in a set of industrial processes. A comparison between different models of fluid flow (laminar model, k- model, and k-ω SST model) in CFD code is showed that; the k- model is most appropriate for calculation of fluid flow in industrial applications. The interaction between the fluid and each particle is performed through a drag force. The effect of the local particle concentration on the drag force is modeled by a porosity function. The simulations results are revealed that the value of exponent of porosity shows substantial dependence on the size of the Representative Volume Element (REV), tortuosity and the velocity of the fluid flow. Finally, the comparison between numerical simulation results with experimental results, in terms of fluidized bed height are showed that the bed expansion height of the fluidized bed is increased with an increase of fluid velocity, and this presents already a very good fit, which eventually achieve an optimization of fluidization processes.

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Section: Introductionmentioning

confidence: 99%