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The Effect of Non-Continuous Inlet Air on Increasing the Segregation of Binary Particles in a Fluidized Bed

[+] Author Affiliations
Maysam Saidi, Hassan Basirat Tabrizi, Sina Chaichi, Majid Dehghani

Amirkabir University of Technology, Tehran, Iran

Paper No. IMECE2014-37281, pp. V007T09A005; 6 pages
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering Systems and Technologies
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4954-5
  • Copyright © 2014 by ASME


Flotation of solid particles by means of fluids provides a widely used device known as fluidized bed. The ability of segregation of dissimilar particles due to the difference in their weight and exerted drag force is the motivation of this study to use fluidized bed as a separator. There are different parameters in a fluidized bed which affect the segregation. These include the inlet air, the bed geometry, and the particles properties such as size and density. To improve the segregation of particles, pulsated inlet air seems to be a good choice. Experimental procedure is conducted using a cylindrical fluidized bed. Effect of the composition, airflow rate and pulsating frequency are investigated by calculating the segregation efficiency. It is observed that segregation of the flotsam rich composition is better than other ones. Increase in segregation efficiency is attainable by increasing the inlet flow rate until the mixing starts, which is the cause of efficiency decrease. The main feature of this study is pulsifying the air flow with frequencies of 1, 2, and 4 Hz and investigation of its effect on the segregation efficiency. The significant increase in the segregation efficiency is achieved by changing the inlet air from continuous to pulsating. The positive effect of pulsation can be explained based on the higher peak velocity and the ability of diminishing the channel-like spaces.

Copyright © 2014 by ASME



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