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

Autor:	Raufaste, Christophe, Dollet, Benjamin, Mader, Kevin, Santucci, Stéphane, Mokso, Rajmund
Rok vydání:	2015
Předmět:	Physics - Fluid Dynamics Condensed Matter - Soft Condensed Matter
Druh dokumentu:	Working Paper
DOI:	10.1209/0295-5075/111/38004
Popis:	Thanks to ultra fast and high resolution X-ray tomography, 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 suggest that rearrangements are triggered when films faces get smaller than a characteristic area. Comment: 5 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1503.05785 Zobrazit plný text záznamu View this record from Arxiv