The effect of sphere roughness on the rheology of concentrated suspensions

Ji Young Moon, Shaocong Dai, Li Chang, Joon Sang Lee, Roger I. Tanner

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


We present the results of measuring the viscometric flow of concentrated rigid-sphere suspensions with constant-viscosity matrices, both Newtonian (silicone oil) and non-Newtonian (Boger fluid: corn syrup (79.4%)-glycerin (19.8%)-4%PAA water (0.78%)). Various problems with the measurements are discussed, including settling due to density differences. The effect of sphere roughness on shear rheology is a main concern of the work. The viscosities of silicone oil and Boger fluid suspensions were increased by increasing sphere roughness, and the normal stress difference N1-N2 in the Boger fluid suspension also increased with roughness.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalJournal of Non-Newtonian Fluid Mechanics
Publication statusPublished - 2015 Sept 1

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V..

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics


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