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Three-dimensional foam flow resolved by fast X-ray tomographic microscopy

Abstract : Adapting fast tomographic microscopy, we managed to capture the evolution of the local structure of the bubble network of a 3D foam flowing around a sphere. As for the 2D foam flow around a circular obstacle, we observed an axisymmetric velocity field with a recirculation zone, and indications of a negative wake downstream the obstacle. The bubble deformations, quantified by a shape tensor, are smaller than in 2D, due to a purely 3D feature: the azimuthal bubble shape variation. Moreover, we were able to detect plastic rearrangements, characterized by the neighbor-swapping of four bubbles. Their spatial structure suggests that rearrangements are triggered when films faces get smaller than a characteristic area.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01192711
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Submitted on : Thursday, September 3, 2015 - 1:14:27 PM
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Christophe Raufaste, Benjamin Dollet, Kevin Mader, Stéphane Santucci, Rajmund Mokso. Three-dimensional foam flow resolved by fast X-ray tomographic microscopy. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2015, 111 (3), pp.38004. ⟨10.1209/0295-5075/111/38004⟩. ⟨hal-01192711⟩

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