Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D11: Drops and Jets of Complex Fluids
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B216
Chair: Hyoungsoo Kim, Korea Advanced Institute of Science and Technology
Abstract ID: BAPS.2018.DFD.D11.9
Abstract: D11.00009 : Effects of finite surface shear viscosity in ring-sheared drops.*
4:14 PM–4:27 PM
Presenter:
Shreyash Gulati
(Rensselaer Polytechnic Institute)
Authors:
Shreyash Gulati
(Rensselaer Polytechnic Institute)
Frank Riley
(Rensselaer Polytechnic Institute)
Amir Hirsa
(Rensselaer Polytechnic Institute)
Juan Lopez
(Arizona State University)
Bulk flow and mixing within ring-sheared drops was reported recently. In the ring-sheared drop, the drop is constrained by two contact rings, where typically one of the rings rotates steadily while the other is stationary. Rotation of the ring generates a strong flow in the bulk through surface shear viscosity. The previous work assumed that the size of the drop is small and the surface shear viscosity is large, so that interfacial stress dominates over the viscous stress in the bulk. Here, this restriction is relaxed so that we can model flow in large drops, such as those that can be grown in microgravity, and drops with arbitrarily small surface shear viscosity. The computations reveal that even small surface shear viscosity can produce a significant secondary flow at moderate Reynolds numbers Re = 100. At very low Re, surface viscosity makes very little difference. At very high Re, secondary flow becomes very weak if surface viscosity is small and the flow tends toward solid-body rotation. Finally, for finite surface shear viscosity, the flow field in the ring-sheared drop was found to be stronger than the flow field in its cylindrical analog, namely a knife-edge surface viscometer.
*Supported by NASA grant NNX13AQ22G
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D11.9
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