A tentative geometrical description of static dilatancy in liquid foams: ordered 2D and 3D foams

Details A tentative geometrical description of static dilatancy in liquid foams: ordered 2D and 3D foams A tentative geometrical description of static dilatancy in liquid foams: ordered 2D and 3D foams

2009-09-26

arxiv.org/abs/0909.4875v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages preprint

Scientific paper

Liquid foams have been observed to behave like immersed granular materials in at least one respect: deformation tends to raise their liquid contents, a phenomenon called dilatancy. We present a geometrical interpretation thereof in foams squeezed between two solid plates (2D GG foams), which contain pseudo Plateau borders along the plates, and in 3D foams. While experimental observations evidenced the effect of a continuous deformation rate (dynamic dilatancy), the present argument applies primarily to elastic deformation (static dilatancy). We show that the negative dilatancy predicted by Weaire and Hutzler (Phil. Mag. 83 (2003) 2747) at very low liquid fractions is specific to ideal 2D foams and should not be observed in the dry limit of real 2D foams.

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