Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session S01: Poster Session & Refreshment Break IV (3:34 - 4:25 p.m.)
3:34 PM,
Monday, November 20, 2023
Room: Exhibit Hall D
Abstract: S01.00012 : Effect of interfacial surfactant transport on the late-time dynamics of Marangoni stress-driven droplets
Presenter:
Arkava Ganguly
(University of Colorado Boulder)
Authors:
Arkava Ganguly
(University of Colorado Boulder)
Benjamin Alessio
(Stanford University)
Ankur Gupta
(University of Colorado, Boulder)
In our work, we describe a theoretical framework to investigate the effect of the interfacial transport and kinetics of the surfactant on the dynamics of active droplet propulsion. We solve surfactant transport equations in the bulk and on the droplet surface, and couple the two phenomena through an adsorption/desorption source term. Our framework allows for a nonlinear EOS, which is then used to predict droplet propulsion speed based on self-generated Marangoni flow. We demonstrate the utility of our framework by applying it to model problems and show how it is able to capture the time-dependent motion of active droplets. Specifically, we are able to predict time-dependent velocities and droplet stoppage which are not possible through early-time calculations.
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