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Uniaxial extensional flows in liquid bridges

Published online by Cambridge University Press:  13 December 2004

EBERHARD BÄNSCH ,
CHRISTIAN P. BERG  and
ANTJE OHLHOFF
EBERHARD BÄNSCH
Affiliation:
Weierstrass Institute for Applied Analysis and Stochastics, Mohrenstrasse 39, D-10117 Berlin, and Freie Universität Berlin, Arnimallee 2–6, D-14195 Berlin, Germany
CHRISTIAN P. BERG
Affiliation:
Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Am Fallturm, Bremen, D-28359, Germany
ANTJE OHLHOFF
Affiliation:
Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Am Fallturm, Bremen, D-28359, Germany
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Abstract

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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 521 , 25 December 2004 , pp. 353 - 379
Copyright
© 2004 Cambridge University Press

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