Marangoni elasticity of flowing soap films

Kim and Mandre

Phys. Rev. Fluids 2, 082001(R) (2017) PDF

Aug 28, 2017 Fluid Mechanics Surfactants

Abstract:

We measure the Marangoni elasticity of a flowing soap film to be 22 mN/m irrespective of its width, thickness, flow speed, or the bulk soap concentration. We perform this measurement by generating an oblique shock in the soap film and measuring the shock angle, flow speed, and thickness. We postulate that the elasticity is constant because the film surface is crowded with soap molecules. Our method allows nondestructive measurement of flowing soap film elasticity and the value 22 mN/m is likely applicable to other similarly constructed flowing soap films.

Part of the group's work on Flowing soap films.

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