Uniaxial extensional flows in liquid bridges

In this paper we consider the possibility of generating homogeneous flows with a nearly constant strain rate. This is achieved by stretching an almost cylindrical liquid bridge under microgravity. One key issue is the adjustability of the disk diameters, necessary for maintaining ideal boundary cond...

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Bibliographic Details
Published in:Journal of fluid mechanics 2004-12, Vol.521, p.353-379
Main Authors: BÄNSCH, EBERHARD, BERG, CHRISTIAN P., OHLHOFF, ANTJE
Format: Article
Language:English
Subjects:
Boundary conditions
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fluid dynamics
Fluid mechanics
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Physics
Rheology
Surface-tension-driven instability
Techniques and apparatus
Viscosity measurements
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Summary:In this paper we consider the possibility of generating homogeneous flows with a nearly constant strain rate. This is achieved by stretching an almost cylindrical liquid bridge under microgravity. One key issue is the adjustability of the disk diameters, necessary for maintaining ideal boundary conditions. We first study the stretching of two different fluids by both numerical and experimental means. The numerical results are compared with the experimental data and very good agreement is found. The numerical method is then used to study the behaviour of liquid bridges for quite a large range of the flow parameters (capillary number $\Ca$ and Weber number $\We$) in order to detect those regimes with most suitable flow conditions.
ISSN:0022-1120
1469-7645
DOI:10.1017/S0022112004001193