Effects of air entrainment on the rheology of concentrated suspensions during continuous processing

Dilhan M. Kalyon, Rahmi Yazici, Cherian Jacob, Birnur Aral, Steve W. Sinton

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Samples of a concentrated suspension were systematically collected from the mixing volume of a continuous processor. The large amplitude oscillatory shear behavior of the samples was found to be significantly affected by the screw configuration employed and the location. Microstructural analyses employing nuclear magnetic resonance imaging, wide‐angle X‐ray diffraction and X‐ray radioscopy revealed substantial entrainment of air into the suspension during continuous processing. The volume fraction of the entrained air increased with geometries and operating conditions leading to partially full channels. Overall, air entrainment is identified as a dominant factor in the development of the microstructure and the rheology of concentrated suspensions and should be considered in their optimum processing.

Original languageEnglish
Pages (from-to)1386-1392
Number of pages7
JournalPolymer Engineering and Science
Volume31
Issue number19
DOIs
StatePublished - Oct 1991

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