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Marangoni elasticity of flowing soap films

Ildoo Kim* and Shreyas Mandre

  • School of Engineering, Brown University, Providence, Rhode Island 02912, USA

  • *ildoo_kim@brown.edu
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Phys. Rev. Fluids 2, 082001(R) – Published 28 August, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.082001

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.

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Outline

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Phys. Rev. Fluids 2, 082001(R)– Published 28 August, 2017
  • Received 3 October 2016

©2017 American Physical Society

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