Viscoelastic Free-Boundary Problems: Non-Newtonian Viscosity vs Normal Stress Effects
- 6 October 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 79 (14), 2662-2665
- https://doi.org/10.1103/physrevlett.79.2662
Abstract
We study the viscous fingering instability and the motion of long bubbles in tubes for two different polymer solutions. For similar non-Newtonian viscosities, the results are strikingly different: Flexible polymers widen the viscous fingers, whereas stiff polymers narrow the fingers. A study of the motion of air bubbles in a tube filled with the polymer solution shows that the difference is due to normal stress effects; these are large for the flexible polymer and undetectable for the stiff polymer.Keywords
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