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Article
Clusters identification and characterization in a gas-solid fluidized bed by the wavelet analysis
Canadian Journal of Chemical Engineering (2009)
  • Forough Afsahi
  • Rahmat Sotudeh-Gharebagh
  • Navid Mostoufi, University of Tehran
Abstract

The local solid flow structure of the bubbling fluidized bed of sand particles was investigated in order to identify and characterize the clusters. Extensive experiments were carried out using an optical fiber probe, measuring the velocity and the diameter of clusters. Under all operating conditions, ascending and descending clusters co-existed at all measurement locations. The locus of the inversion point at which the directions of cluster motion changed was determined. The velocity of the ascending clusters was a function of both superficial gas velocity and the radial and axial position. With increasing superficial gas velocity, both the velocity and the diameter of ascending clusters decreased near the wall. However, the velocity of descending clusters depended mainly on superficial gas velocity and the largest clusters existed closer to the wall. The results of this study help to explain cluster hydrodynamics in fluidized beds.

Keywords
  • Bubbling fluidized bed; Cluster velocity; Cluster diameter; Wavelet
Disciplines
Publication Date
2009
Citation Information
Forough Afsahi, Rahmat Sotudeh-Gharebagh and Navid Mostoufi. "Clusters identification and characterization in a gas-solid fluidized bed by the wavelet analysis" Canadian Journal of Chemical Engineering Vol. 87 (2009)
Available at: http://works.bepress.com/navid_mostoufi/38/