Effect of impeller speed on mechanical and dissolution properties of high-shear granules

Chirangano Mangwandi, M.J. Adams, M.J. Hounslow, A.D. Salman

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


Impeller speed is one of the most crucial process variables that affect the properties of the granules produced in a high-shear granulator. Several reports can be found in literature that discuss the influence of impeller speed on the granules size. For instance some researchers like Knight report an increase of granule size with impeller speed [1] and [2], while others (Scheaefer et al. and Ramaker et al.) observed a decrease of granules size with increasing impeller speed [3] and [4]. However there is limited work reported in literature on the effect of the impeller speed on the mechanical properties of granules. Mechanical properties are important as they affect the performance of the granules on the other downstream process such as transportation and handling. The work reported here serves to address the missing in knowledge gap regarding the influence of impeller speed on mechanical properties granules. How the granulation system responds to the changes in the impeller speeds depends on binder that is used in the process. For this reason the two extreme cases, of a low viscosity binder system and high viscosity binder system are considered in this research. For low viscosity binder system it was observed that the granule size decreased with increasing impeller speed whilst for the high viscosity binder system the opposite was observed by Knight [1]. The granule strength, the Young's modulus and yield strength of the high viscosity granules increased with increasing impeller speed where as the opposite trends were observed for the low viscosity binder granules.
Original languageEnglish
Pages (from-to)305-315
Number of pages11
JournalChemical Engineering Journal
Issue number2-3
Publication statusPublished - 01 Nov 2010
Event9th International Symposium on Agglomeration/4th International Granulation Workshop - Sheffield, United Kingdom
Duration: 01 Jun 201001 Jun 2010

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Chemistry
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry


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