J. Phys. II France
Volume 5, Number 10, October 1995
Page(s) 1567 - 1576
DOI: 10.1051/jp2:1995199
J. Phys. II France 5 (1995) 1567-1576

Effect of Interfacial Rheology on Foams Viscoelasticity, an Effective Medium Approach

Y. Hemar, R. Hocquart and F. Lequeux

Laboratoire Ultrasons et Dynamique des Fluides Complexes U.R.A. 851 C.N.R.S., Institut Le Bel, 4 rue Blaise Pascal, 67070 Strasbourg, France

(Received 10 March 1995, revised 6 June 1995, accepted 21 June 1995)

We have computed in 3-dimensional foams the influence of interfacial rheology on the macroscopic foam viscoelasticity. We show that the two interfacial moduli play different roles. The dilational viscosity is not at all additive to the macroscopic modulus, while both the interfacial shear viscosity and the internal phase modulus are nearly additive. The dilational viscosity is shunted by a grid mode at high frequency. The calculations are done in a selfconsistent effective medium approximation.

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