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Shaken not stirred — On internal flow patterns in oscillating sessile drops

Oh, Jung Min and Legendre, Dominique and Mugele, Frieder Shaken not stirred — On internal flow patterns in oscillating sessile drops. (2012) Europhysics Letters, 98 (3). ISSN 0295-5075

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Official URL: http://dx.doi.org/10.1209/0295-5075/98/34003

Abstract

We use numerical (volume of fluid) simulations to study the flow in an oscillating sessile drop immersed in an ambient immiscible fluid. The drop is excited by a sinusoidal variation of the contact angle at variable frequency. We identify the eigenfrequencies and eigenmodes of the drops and analyze the internal flow fields by following the trajectories of tracer particles. The flow fields display an oscillatory component as well as a time-averaged mean component. The latter is oriented upward along the surface of the drop from the contact line towards the apex and downward along the symmetry axis. It vanishes at high and low frequencies and displays a broad maximum around f =200–300Hz. We show that the frequency dependence of the mean flow can be described in terms of Stokes drift driven by capillary waves that originate from the contact line, in agreement with recent experiments.

Item Type:Article
Additional Information:Thanks to EPL editor. The definitive version is available at http://iopscience.iop.org/0295-5075/98/3/34003/
HAL Id:hal-00920085
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Twente (NETHERLANDS)
Laboratory name:
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Deposited By: Dominique LEGENDRE
Deposited On:17 Dec 2013 16:00

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