Article
Reverse Marangoni surfing
Journal of Fluid Mechanics
(2016)
Abstract
We theoretically study the surfing motion of chemically and thermally active particles located at a flat liquid–gas interface that sits above a liquid layer of finite depth. The particles’ activity creates and maintains a surface tension gradient resulting in the auto-surfing. It is intuitively perceived that Marangoni surfers propel towards the direction with a higher surface tension. Remarkably, we find that the surfers may propel in the lower surface tension direction depending on their geometry and proximity to the bottom of the liquid layer. In particular, our analytical calculations for Stokes flow and diffusion-dominated scalar fields (i.e. chemical concentration and temperature fields) indicate that spherical particles undergo reverse Marangoni propulsion under confinement whereas disk-shaped surfers always move in the expected direction. We extend our results by proposing an approximate formula for the propulsion speed of oblate spheroidal particles based on the speeds of spheres and disks.
Keywords
- interfacial flows (free surface),
- low-Reynolds-number flows,
- Marangoni convection
Disciplines
Publication Date
December 15, 2016
DOI
10.1017/jfm.2016.695
Publisher Statement
© 2016 Cambridge University Press. Publisher's version of record: https://doi.org/10.1017/jfm.2016.695
Citation Information
Vahid Vandadi, Saeed J Kang and Hassan Masoud. "Reverse Marangoni surfing" Journal of Fluid Mechanics Vol. 811 (2016) p. 612 - 621 ISSN: 0022-1120 Available at: http://works.bepress.com/hassan-masoud/2/