Influences of the fluidizing and spouting pulsation on particle motion in spout-fluid beds--颗粒学报PARTICUOLOGY

Saidi, M., & Basirat Tabrizi, H. (2018). Influences of the fluidizing and spouting pulsation on particle motion in spout-fluid beds. Particuology, 36, 139-148. https://doi.org/10.1016/j.partic.2016.11.007

Influences of the fluidizing and spouting pulsation on particle motion in spout-fluid beds

Maysam Saidi ^a^*, Hassan Basirat Tabrizi ^b

a Department of Mechanical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
b Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

10.1016/j.partic.2016.11.007

Volume 36, February 2018, Pages 139-148

Received 29 March 2016, Revised 24 October 2016, Accepted 2 November 2016, Available online 28 June 2017, Version of Record 22 December 2017.

E-mail: msaidi@razi.ac.ir

Highlights

• Effect of flow pulsations on a spout-fluid bed was investigated.

• Pressure drop was shown to be a function of pulsation parameters and configuration.

• Pulsation enhanced particle motion and bed behavior with equal air consumption.

• Up to 19% increase in average moving distance showed applicability of pulsation.

Abstract

Effects of variable airflow on particle motion in spout-fluid beds are studied. Computational fluid dynamics using Navier–Stokes equations for the gas phase coupled with the discrete element method using Newton's laws for the solid phase have been employed. Results indicate that increasing the fluidizing velocity diminishes dead zones and increases both the total height of the bed and the traversed distance by particles in the steady spout-fluid bed. In pulsed airflows, two configurations are investigated, namely, the spouted pulsed-fluidized bed with pulsed flow of the fluidizing velocity, and the pulsed-spouted fluidized bed with pulsed flow of the spouting velocity. The positive effect of pulsation on particle motion is shown and the effects of parameters, such as amplitude and frequency, on the dynamics of the bed are investigated in each configuration. An increase of up to 19% in traversed distance is found for the range studied, which suggests flow pulsation as a promising technique for increasing particle mixing in spout-fluid beds.

Graphical abstract

Keywords

Computational fluid dynamics; Discrete element method; Flow pulsation; Gas–solid; Particle; Spout-fluid bed

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