Mapping of the Marangoni effect in soap films using Young's double-slit experiment
1 IPR, UMR CNRS 6251, Université de Rennes I - 35042 Rennes Cedex, France
2 LPL, URU 435, Université de Rennes I - 35042 Rennes Cedex, France
Received: 20 August 2013
Accepted: 30 September 2013
We report on the thickness variation measurement of a soap film due to a local perturbation, using Young's double-slit experiment configuration. We map a laser-heated deformation of a vertical free-standing draining thin soap film using the differential change of optical path in the interferometer. The experiment has a resolution of about 0.1 nm and enables to follow the liquid flow dynamics. We evidence a bottleneck formation in the heated region of the film that perturbs the usual flow. Such an experimental set-up could then be adapted to measure other tiny variations in fluctuating hydrodynamics such as capillary waves for example.
PACS: 47.55.pf – Marangoni convection / 42.87.Bg – Phase shifting interferometry / 47.20.Bp – Buoyancy-driven instabilities (e.g., Rayleigh-Benard)
© EPLA, 2013