Marangoni shocks in unobstructed soap-film flows

Details Marangoni shocks in unobstructed soap-film flows Marangoni shocks in unobstructed soap-film flows

2009-01-22

arxiv.org/abs/0901.3383v2

Physical Review Letters, vol. 103, 104501 (2009)

Physics

Fluid Dynamics

4 pages, 5 figures, published in PRL

Scientific paper

It is widely thought that in steady, gravity-driven, unobstructed soap-film flows, the velocity increases monotonically downstream. Here we show experimentally that the velocity increases, peaks, drops abruptly, then lessens gradually downstream. We argue theoretically and verify experimentally that the abrupt drop in velocity corresponds to a Marangoni shock, a type of shock related to the elasticity of the film. Marangoni shocks induce locally intense turbulent fluctuations and may help elucidate the mechanisms that produce two-dimensional turbulence away from boundaries.

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