publication . Preprint . Article . 2017

Marangoni elasticity of flowing soap films

Ildoo Kim; Shreyas Mandre;
Open Access English
  • Published: 28 Aug 2017
Abstract
We measure the Marangoni elasticity of a flowing soap film to be 22 dyne/cm 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 non-destructive measurement of flowing soap film elasticity, and the value 22 dyne/cm is likely applicable to other similarly constructed flowing soap films.
Subjects
free text keywords: Physics - Fluid Dynamics, Condensed Matter - Soft Condensed Matter, Physics, Oblique shock, Optics, business.industry, business, Soap film, Marangoni effect, Flow velocity, Soap bubble, Elasticity (economics), Dyne
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