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Soft Matter and Biological Physics


Eur. Phys. J. E 4, 299-304

Deformed foam structure and transitions in a tube

D. Reinelt1, P. Boltenhagen2 and N. Rivier2

1  Department of Mathematics, Southern Methodist University, Dallas, TX 75275, USA
2  Laboratoire de Dynamique des Fluides Complexes, UMR 7506, 3 rue de l'Université, F-67084, Strasbourg Cedex, France

(Received 3 August 2000)

Abstract
The "staircase"(2,1,1) foam structure in an ordered foam under expansion in a cylindrical tube and the structural transition to the "bamboo" (1,1,0) structure are studied experimentally, analytically, and numerically using the Surface Evolver minimization program. An analytical expression of the oblique interface in the (2,1,1) structure, a minimal surface, but curved by stretching of the foam, is given as a classic example of singular perturbation (boundary layer) theory. The structural transition from staircase structure to bamboo structure takes place at a considerable dilation. The transition is not due to an edge length tending to zero continuously with dilation, but results from the equilibrium (2,1,1) solution losing its stability due to a saddle node bifurcation.

PACS
61.72.-y - Defects and impurities in crystals; microstructure.
63.70.+h - Statistical mechanics of lattice vibrations and displacive phase transitions.
02.30.Mv - Approximations and expansions.


© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2001