Journal
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
Volume 110, Issue 1, Pages 27-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0377-0257(02)00171-4
Keywords
contraction flow; rigid rod suspension; semi-rigid polymer; elongational viscosity; vortex growth
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We study experimentally semi-dilute solutions of xanthan, a semi-rigid polymer, flowing through an axisymmetric orifice. The pressure drop through the orifice and the size of the secondary vortex upstream of the orifice are measured simultaneously as a function of the flow rate. The results indicate that xanthan solutions behave like suspensions of rigid rods in a Newtonian solvent. Quantitatively, this analogy is supported by a theoretical analysis which combines a macroscopic flow model and the use of a microscopic variable reflecting the contribution of the rods to the bulk stress. With this simple model, it is possible to obtain the elongation viscosity of semi-rigid polymer solutions and estimate unknown macromolecular parameters. (C) 2002 Elsevier Science B.V. All rights reserved.
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