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Volume entrained in the wake of a disk intruding into an oil-water interface

Ivo R. Peters1,2,*, Matteo Madonia1, Detlef Lohse1,3, and Devaraj van der Meer1

  • 1Physics of Fluids Group, Faculty of Science and Technology, J.M. Burgers Center for Fluid Dynamics, and MESA+ Institute, University of Twente, 7500 AE Enschede, Netherlands
  • 2Engineering and the Environment, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
  • 3Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany

  • *i.r.peters@soton.ac.uk
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Phys. Rev. Fluids 1, 033901 – Published 1 July, 2016

DOI: https://doi.org/10.1103/PhysRevFluids.1.033901

Abstract

An object moving through a plane interface into a fluid deforms the interface in such a way that fluid from one side of the interface is entrained into the other side, a phenomenon known as Darwin's drift. We investigate this phenomenon experimentally using a disk which is started exactly at the interface of two immiscible fluids, namely, oil and water. First, we observe that due to the density difference between the two fluids the deformation of the interface is influenced by gravity and show that there exists a time window of universal behavior. Second, we show by comparing with boundary integral simulations that, even though the deformation is universal, our results cannot be fully explained by potential flow solutions. We attribute this difference to the starting vortex, which is created in the wake of the disk. Besides contributing significantly to entrainment directly, the vortex also influences the interface deformation due to Darwin's drift. Universal behavior is preserved, however, because the size and strength of the vortex shows the same universality as the potential flow solution.

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References (24)

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Phys. Rev. Fluids 1, 033901– Published 1 July, 2016
  • Received 12 January 2016

©2016 American Physical Society

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