Instabilities in foam clusters related to the pressures in the bubblesM.F. Vaz and M.A. Fortes
ICEMS - Instituto de Ciência e Engenharia de Materiais e Superfícies and Departamento de Engenharia de Materiais, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisboa, Portugal email@example.com
(Received 20 September 2002 and Received in final form 22 December 2002 / Published online: 27 May 2003)
We reinterpret an instability in a two-dimensional free foam cluster previously discussed by Weaire et al. (Eur. Phys. J. E 7, 123 (2002)) in terms of the excess pressure in the bubbles. We conclude that in a free foam cluster no bubble can have a pressure below that of the surrounding gas.
82.70.Rr - Aerosols and foams.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003