Velocity Field in a Vertical Foam Film - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2017

Velocity Field in a Vertical Foam Film

Abstract

The drainage of vertical foam films governs their lifetime. For a foam film supported on a rectangular solid frame, when the interface presents a low resistance to shear, the drainage dynamics involves a complex flow pattern at the film scale, leading to a drainage time proportional to the frame width. Using an original velocimetry technique, based on fluorescent foam films and photobleaching, we measure the horizontal and vertical components of the velocity in a draining film, thus providing the first quantitative experimental evidence of this flow pattern. Upward velocities up to 10  cm/s are measured close to the lateral menisci, whereas a slower velocity field is obtained in the center of the film, with comparable downwards and horizontal components. Scaling laws are proposed for all characteristic velocities, coupling gravitational effects, and capillary suction.
Fichier principal
Vignette du fichier
seiwert_resub.pdf (1.6 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01449601 , version 1 (30-01-2017)

Identifiers

Cite

Jacopo Seiwert, Ronan Kervil, Soniraks Nou, Isabelle Cantat. Velocity Field in a Vertical Foam Film. Physical Review Letters, 2017, 118 (4), ⟨10.1103/PhysRevLett.118.048001⟩. ⟨hal-01449601⟩
121 View
200 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More