Volume 115, Number 6, September 2016
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||04 November 2016|
Bubbles slipping along a crenelated wall
Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière - F-69622, Villeurbanne, France
Received: 29 July 2016
Accepted: 17 October 2016
We describe the ascent dynamics of air bubbles squeezed against a rigid crenelated plate immersed in a liquid bath. Depending on its shape and the inclination angle, the bubbles can remain trapped in the crenelations, or slip against the wall. In particular, the yield force separating the two regimes increases with the height of the crenels. In the second regime, the slipping motion is characterized by a capillary number which barely depends on the crenel geometry (wavelength and amplitude), at large enough angles. We finally discuss the regime of intermediate angles, and interpret the measured oscillations in bubble velocities through the existence of a (spatially) periodic force. These results provide information at the bubble scale for processes at play in the slip of foams and emulsions against rough walls.
PACS: 47.55.D- – Drops and bubbles / 47.55.dr – Interactions with surfaces / 83.50.Rp – Wall slip and apparent slip
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.