Magnetically assisted gas–solid fluidization in a tapered vessel: Part II: Dimensionless bed expansion scaling--颗粒学报PARTICUOLOGY

Hristov, J. (2009b). Magnetically assisted gas–solid fluidization in a tapered vessel: Part II: Dimensionless bed expansion scaling. Particuology, 7(3), 183–192. https://doi.org/10.1016/j.partic.2009.01.012

Magnetically assisted gas–solid fluidization in a tapered vessel: Part II: Dimensionless bed expansion scaling

Jordan Hristov^*

Department of Chemical Engineering, University of Chemical Technology and Metallurgy, 1756 Sofia, 8 Kl. Ohridsky Blvd., Bulgaria

10.1016/j.partic.2009.01.012

Volume 7, Issue 3, June 2009, Pages 183-192

Received 7 October 2008, Accepted 6 January 2009, Available online 18 April 2009.

E-mail: jordan.hristov@mail.bg

Highlights

Abstract

The article presents an effort to create dimensionless scaling correlations of the overall bed porosity in the case of magnetically assisted fluidization in a tapered vessel with external transverse magnetic field. This is a stand of portion of new branch in the magnetically assisted fluidization recently created concerning employment of tapered vessels. Dimensional analysis based on “pressure transform” of the initial set of variables and involving the magnetic granular Bond number has been applied to develop scaling relationships of dimensionless groups representing ratios of pressures created by the fluid flow, gravity and the magnetic field over an elementary volume of the fluidized bed. Special attention has been paid on the existing data correlations developed for non-magnetic beds and the links to the new ones especially developed for tapered magnetic counterparts. A special dimensionless variable combining Archimedes and Rosensweig numbers has been conceived for porosity correlation. Data correlations have been performed by power-law, exponential decay and asymptotic functions with analysis of their adequacies and accuracies of approximation.

Graphical abstract

Keywords

Fluidization; Magnetization FIRST; Tapered bed; Dimensional analysis; Pressure transform of variables; Magnetic granular Bond number; Rosensweig number; Porosity correlations

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