Interface instabilities during displacements of two miscible fluids in a vertical pipe
- 1 March 2001
- journal article
- Published by AIP Publishing in Physics of Fluids
- Vol. 13 (3), 553-556
- https://doi.org/10.1063/1.1343907
Abstract
We study experimentally the downward vertical displacement of one miscible fluid by another in a vertical pipe at sufficiently high velocities for diffusive effects to be negligible. For certain viscosity ratios and flow rates, the interface between the two fluids can destabilize. We determine the dimensionless flow rate Uc above which the instability is triggered and its dependence on the viscous ratio M, resulting in a stability map Uc=Uc(M). Two different instability modes have been observed: an asymmetric “corkscrew” mode and an axisymmetric one. We remark that the latter is always eventually disturbed by “corkscrew” type instabilities. We speculate that these instabilities are driven by the viscosity stratification and are analogous to those already observed in core annular flows of immiscible fluids.Keywords
This publication has 10 references indexed in Scilit:
- Miscible displacement in a Hele-Shaw cell at high ratesJournal of Fluid Mechanics, 1999
- Miscible displacements in capillary tubes. Part 1. ExperimentsJournal of Fluid Mechanics, 1996
- Lubricated pipelining: stability of core—annular flow. Part 5. Experiments and comparison with theoryJournal of Fluid Mechanics, 1992
- Lubricated pipelining: stability of core–annular flow. Part 4. Ginzburg–Landau equationsJournal of Fluid Mechanics, 1991
- Lubricated pipelining. Part 3 Stability of core-annular flow in vertical pipesJournal of Fluid Mechanics, 1990
- Lubricated pipelining: stability of core-annular flow. Part 2Journal of Fluid Mechanics, 1989
- Lubricated pipelining: stability of core-annular flowJournal of Fluid Mechanics, 1989
- A note on the mechanism of the instability at the interface between two shearing fluidsJournal of Fluid Mechanics, 1984
- Instability due to Viscosity and Density Stratification in Axisymmetric Pipe FlowPhysics of Fluids, 1971
- Instability due to viscosity stratificationJournal of Fluid Mechanics, 1967