Abstract
It is shown that the exact solution of the torsional flow of a class of Oldroyd-type fluids is kinematically similar to that for a Newtonian fluid. Furthermore, it is shown by a linearized stability analysis and by numerical integration, that the basic flow is unstable at high Weissenberg numbers. An Oldroyd fluid which has a negative second-normal stress coefficient is found to be more stable than one with zero (or positive) second-normal stress coefficient in this flow.
Original language | English |
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Pages (from-to) | 551-555 |
Number of pages | 5 |
Journal | Rheologica Acta |
Volume | 24 |
Issue number | 6 |
DOIs | |
Publication status | Published - Nov 1985 |
Keywords
- Oldroyd-B fluid
- stability
- Torsional flow