Mapping of the Marangoni effect in soap films using Young's double-slit experiment

Janine Emile (1) , Olivier Emile (2)

1 IPR - Institut de Physique de Rennes
2 URU 435 LPL - URU 435 Laboratoire de physique des lasers

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.

Domaines: Dynamique des Fluides [physics.flu-dyn]

Janine Emile, Olivier Emile. Mapping of the Marangoni effect in soap films using Young's double-slit experiment. EPL - Europhysics Letters, 2013, 104 (1), pp.14001. ⟨10.1209/0295-5075/104/14001⟩. ⟨hal-00881039⟩