Motion analysis of development of wall slip during die flow of concentrated suspensions

Dilhan M. Kalyon, Halit Gokturk, Piraye Yaras, Birmur K. Aral

Research output: Contribution to conferencePaperpeer-review

10 Scopus citations

Abstract

A microscope and high speed motion analysis equipment were used to image the flow field occurring in die flow of concentrated suspensions following twin screw extrusion processing. The motion analysis revealed the development of a particle-free wall slip layer adjacent to the die wall. The nature of the slip layer is affected by the air content of the suspension. Air bubbles which are spherical away from the wall become ellipsoidal as they approach the wall and completely flatten into a thin film at the wall. The films of air momentarily stick to the die surface and then are dragged back into the bulk of the flowing suspension. The mechanism of slip layer formation and the role played by the entrained air have significant ramifications on the wall slip and rheological behavior of concentrated suspensions.

Original languageEnglish
Pages1130-1134
Number of pages5
StatePublished - 1995
EventProceedings of the 53rd Annual Technical Conference. Part 1 (of 3) - Boston, MA, USA
Duration: 7 May 199511 Oct 1995

Conference

ConferenceProceedings of the 53rd Annual Technical Conference. Part 1 (of 3)
CityBoston, MA, USA
Period7/05/9511/10/95

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