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Hysteretic and chaotic dynamics of viscous drops in creeping flows with rotation

Published online by Cambridge University Press:  30 June 2008

Y.-N. YOUNG ,
J. BŁAWZDZIEWICZ ,
V. CRISTINI  and
R. H. GOODMAN
Y.-N. YOUNG
Affiliation:
Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, NJ 07102-1982, USA
J. BŁAWZDZIEWICZ
Affiliation:
Department of Mechanical Engineering, Yale University, PO Box 20-8286, New Haven, CT, 06520-8286, USA
V. CRISTINI
Affiliation:
School of Health Information Sciences and Biomedical Engineering, The University of Texas Health Science Center, Houston, TX 77030, USA
R. H. GOODMAN
Affiliation:
Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, NJ 07102-1982, USA
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Abstract

We have shown that high-viscosity drops in two-dimensional linear creeping flows with a non-zero vorticity component may have two stable stationary states. One state corresponds to a nearly spherical, compact drop stabilized primarily by rotation, and the other to an elongated drop stabilized primarily by capillary forces. Here we explore consequences of the drop bistability for the dynamics of highly viscous drops. Using both boundary-integral simulations and small-deformation theory we show that a quasi-static change of the flow vorticity gives rise to a hysteretic response of the drop shape, with rapid changes between the compact and elongated solutions at critical values of the vorticity. In flows with sinusoidal temporal variation of the vorticity we find chaotic drop dynamics in response to the periodic forcing. A cascade of period-doubling bifurcations is found to be directly responsible for the transition to chaos. In random flows we obtain a bimodal drop-length distribution. Some analogies with the dynamics of macromolecules and vesicles are pointed out.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 607 , 25 July 2008 , pp. 209 - 234
Copyright
Copyright © Cambridge University Press 2008

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