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Electrically driven toroidal Moffatt vortices: experimental observations

Published online by Cambridge University Press:  05 August 2020

Anthony E. Perri Open the ORCID record for Anthony E. Perri [Opens in a new window] ,
Abhilash Sankaran Open the ORCID record for Abhilash Sankaran [Opens in a new window] ,
Babak Kashir Open the ORCID record for Babak Kashir [Opens in a new window] ,
Christopher Staszel Open the ORCID record for Christopher Staszel [Opens in a new window] ,
Rudolf J. Schick Open the ORCID record for Rudolf J. Schick [Opens in a new window] ,
Farzad Mashayek Open the ORCID record for Farzad Mashayek [Opens in a new window]  and
Alexander L. Yarin Open the ORCID record for Alexander L. Yarin [Opens in a new window]
Anthony E. Perri
Affiliation:
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA Spray Analysis and Research Services, Spraying Systems Co., Wheaton, IL60139, USA
Abhilash Sankaran
Affiliation:
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
Babak Kashir
Affiliation:
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
Christopher Staszel
Affiliation:
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
Rudolf J. Schick
Affiliation:
Spray Analysis and Research Services, Spraying Systems Co., Wheaton, IL60139, USA
Farzad Mashayek
Affiliation:
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
Alexander L. Yarin*
Affiliation:
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
*
†Email address for correspondence: ayarin@uic.edu
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Abstract

In this work, we report the first experimental observation of electrically driven Moffatt vortices between conical surfaces. The flow field is captured using a synchronized multi-camera particle image velocimetry experiment. The results reveal a flow bifurcation resembling Moffatt vortices in canola oil with −12 kV applied to an axisymmetric point-to-plane electrode set-up. The formation of such vortices was predicted theoretically; however, to the best of our knowledge, experimental observations were not reported earlier. The experimental results of the present work are shown to be in agreement with the available theoretical predictions. In addition, the observed vortices are slightly transient, suggesting the next bifurcation reminiscent of the Taylor vortices in the Taylor–Couette flow.

JFM classification

Drops and Bubbles: Electrohydrodynamic effects Complex Fluids: Dielectrics Low-Reynolds-number flows: Stokesian dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 900 , 10 October 2020 , A12
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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