Time scale analysis for fluidizedbedmeltgranulation III: binder solidification rate

Kel W. Chua, Yassir Makkawi, Michael J. Hounslow

Research output: Contribution to journalArticlepeer-review


In series I and II of this study ([Chua et al., 2010a] and [Chua et al., 2010b]), we discussed the time scale of granule–granule collision, droplet–granule collision and droplet spreading in Fluidized Bed Melt Granulation (FBMG). In this third one, we consider the rate at which binder solidifies. Simple analytical solution, based on classical formulation for conduction across a semi-infinite slab, was used to obtain a generalized equation for binder solidification time. A multi-physics simulation package (Comsol) was used to predict the binder solidification time for various operating conditions usually considered in FBMG. The simulation results were validated with experimental temperature data obtained with a high speed infrared camera during solidification of ‘macroscopic’ (mm scale) droplets. For the range of microscopic droplet size and operating conditions considered for a FBMG process, the binder solidification time was found to fall approximately between 10-3 and 10-1 s. This is the slowest compared to the other three major FBMG microscopic events discussed in this series (granule–granule collision, granule–droplet collision and droplet spreading).
Original languageEnglish
Pages (from-to)336-341
Number of pages6
JournalChemical Engineering Science
Issue number3
Publication statusPublished - 1 Feb 2011

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Chemical Engineering Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chua, Kel W.; Makkawi, Yassir and Hounslow, Michael J. (2011). Time scale analysis for fluidizedbedmeltgranulation III: binder solidification rate. Chemical Engineering Science, 66 (3), 336-341. DOI 10.1016/j.ces.2010.10.031


  • fluidization
  • granulation
  • simulation
  • binder solidification
  • particle processing
  • particle technology


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