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 D25: Focus Session: Hydrodynamics of Particles and Macromolecules at Fluid Interfaces II
2:30 PM–4:27 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B313
Chair: Carlos E. Colosqui, Stony Brook University
Abstract ID: BAPS.2018.DFD.D25.3
Abstract: D25.00003 : Squirmers adhered to fluid interfaces*
2:56 PM–3:09 PM
Presenter:
Nicholas G Chisholm
(University of Pennsylvania)
Authors:
Nicholas G Chisholm
(University of Pennsylvania)
Kathleen Joan Stebe
(University of Pennsylvania)
We theoretically investigate active colloids adhered to a clean fluid-fluid interface of arbitrary viscosity ratio in Stokes flow. We adopt the squirmer model in which a spherical colloid is made to self-propel by assigning a tangential slip velocity to its surface. We assume that the fluid maintains a 90° contact angle at the three-phase contact line with the colloid, the contact line is fixed, and the capillary number is small. Thus, we assume a flat fluid-fluid interface bisecting the squirmer at its meridian, and the squirmer is only allowed to translate and rotate in the interfacial plane. Unlike a self-propelled colloid in the bulk, a swimmer attached to an interface may exert a net force and/or torque on the fluid, which are balanced by capillary forces on the swimmer itself. Thus, in the far field, the flow is dominated by a stresslet that can be aligned at an arbitrary angle to the interface. As a result, squirmers that push (pull) against the interface create purely attractive (repulsive) interactions with neighboring bodies. Additionally, by including rotational modes, two adhered squirmers can orbit about a common center or exhibit cooperative self-propulsion.
*Funding is provided by the Gulf of Mexico Research Initiative
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D25.3
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