Numéro |
J. Phys. II France
Volume 5, Numéro 1, January 1995
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Page(s) | 37 - 52 | |
DOI | https://doi.org/10.1051/jp2:1995112 |
J. Phys. II France 5 (1995) 37-52
Linear Shear Rheology of Incompressible Foams
D. M. A. Buzza, C.-Y. D. Lu and M. E. CatesCavendish Laboratory, Madingley Road, Cambridge CB3 0HE, Great-Britain
(Received 7 July 1994, accepted 5 October 1994)
Abstract
We discuss various mechanisms for viscous dissipation in the linear response to oscillatory shear of incompressible foams
(such as biliquid foams or dense emulsions). These include viscous flow of liquid in films and plateau borders; intrinsic
viscosity of the surfactant layers; and diffusion resistance. Marangoni-type and marginal regeneration mechanisms are considered
for the transport of surfactant. We predict (on the basis of typical parameters for biliquid foams) that the zero shear viscosity
is usually dominated by the intrinsic dilational viscosity of the surfactant monolayers, though other forms of dissipation
may be important in certain systems. We give a preliminary analysis of the frequency dependent rheology arising from an interplay
between these dissipation processes and elastic storage mechanisms.
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