Bouncing droplets for measuring elongational viscosity

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When a droplet is gently deposited onto a vibrated liquid bath, the droplet could bounce repeatedly, avoiding coalescence. This peculiar behavior discovered in 2005 [1] is the starting point of an active research on pilot wave dynamics (see for example our project QUANDROPS) and droplet resonance effects [2]. In our last article on the subject [3], we demonstrated that the bouncing behavior of polymeric droplets onto highly viscous bath allows us to study/measure the elongational viscosity of the polymeric samples. It is found that large elongational viscosity of the polymer solution droplets suppressed large droplet deformations.

[1] Y. Couder, E. Fort, C.-H. Gautier, and A. Boudaoud, Phys. Rev. Lett. 94, 177801 (2005). [2] S.Dorbolo, D.Terwagne, N.Vandewalle, and T.Gilet, New J. Phys. 10, 113021 (2008) – PDF
[3] S. Gier, S. Dorbolo, D. Terwagne, N. Vandewalle, and C. Wagner, Bouncing of polymeric droplets on liquid interfaces, Phys. Rev. E 86, 066314 (2012) – PDF

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About nicovdw

Professor in Physics
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One Response to Bouncing droplets for measuring elongational viscosity

  1. Pingback: Bouncing droplets : modes and bifurcations | GRASP | Soft Matter | University of Liège

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