Steady shear banding in complex fluids.

Tsenoglou, Christos and Voyiatzis, Evangelos (2008) Steady shear banding in complex fluids. Journal of Non-Newtonian Fluid Mechanics, 151 (1-3). pp. 119-128. DOI 10.1016/j.jnnfm.2007.09.002.

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Abstract

Shear banding (SB) is manifested by the abrupt “demixing” of the flow into regions of high and low shear rate. In this paper, we first relate analytically the rheological parameters of the fluid with the range of shear rates and stresses of SB occurrence. For this, we accept that the origin of shear banding is constitutive, and adopt a non-linear viscoelastic expression able to accommodate the double-valuedness of the stress with flow intensity, under certain conditions. We then implement the model for the case of pressure driven flow through a cylindrical pipe; we derive approximate expressions for the velocity profile in the two-banded regions (core and outer annular), the overall throughput in the presence or absence of “spurt”, and the radial location limits of the shear rate discontinuity.

Document Type: Article
Research affiliation: Kiel University
Refereed: Yes
Date Deposited: 15 Jun 2017 07:13
Last Modified: 28 Mar 2018 08:51
URI: https://oceanrep.geomar.de/id/eprint/38376

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