Effect of Gaussian size distribution width on minimum fluidization velocity in tapered gas

Rasteh, M., Ahmadi, G., & Hosseini, S. H. (2022). Effect of Gaussian size distribution width on minimum fluidization velocity in tapered gas–solid fluidized beds. Particuology, 66, 71-84. https://doi.org/10.1016/j.partic.2021.09.005

Effect of Gaussian size distribution width on minimum fluidization velocity in tapered gas–solid fluidized beds

Mojtaba Rasteh ^a *, Goodarz Ahmadi ^b, S.H. Hosseini ^c

a Department of Chemical Engineering, Hamedan University of Technology, Hamedan, P.O. Box 65155-579, Iran
b Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5725, USA
c Department of Chemical Engineering, Ilam University, Ilam 69315-516, Iran

10.1016/j.partic.2021.09.005

Volume 66, July 2022, Pages 71-84

Received 9 July 2021, Revised 21 August 2021, Accepted 6 September 2021, Available online 27 September 2021, Version of Record 5 November 2021.

E-mail: mrasteh@hut.ac.ir

Highlights

• Determining minimum fluidization velocity (U_mf) for particles with Gaussian size distribution.

• Evaluating the effects of Gaussian distribution width on Umf.

• Developing an empirical model including the effect of distribution width for U_mf.

• Comparing experimental data with proposed model and other exiting models.

Abstract

This paper investigated the effect of Gaussian distribution width, average particle diameter, particle loading, and the tapered angle on minimum fluidization velocity (U_mf) by conducting extensive experiments in tapered fluidized beds. Three powders with Gaussian size distribution and different distribution widths were used in the experiments. An increase in U_mf with increasing the average particle diameter, particle loading, and the tapered angle was observed. There was also a nonmonotonic behavior of U_mf as the Gaussian distribution width increased. An empirical correlation including dimensionless groups for predicting U_mf in tapered beds was developed in which the effect of distribution width was considered. The proposed correlation predictions were in good agreement with the experimental data, with a maximum deviation of 16.5% and average and standard deviations of, respectively, 6.4% and 7.4%. The proposed correlation was also compared with three earlier models, and their accuracy was discussed.

Graphical abstract

Keywords

Tapered fluidized bed; Minimum fluidization velocity; Gaussian size distribution; Distribution width; Dimensional analysis

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