Viscous force exerted on a foam at a solid boundary: Influence of the liquid fraction and of the bubble sizeE. Terriac, J. Etrillard and I. Cantat
GMCM UMR 6626, Université Rennes I - 35042 Rennes cedex, France
received 25 October 2005; accepted in final form 30 March 2006
published online 26 April 2006
We study experimentally the pressure drop needed to push a bubble train in a millimetric channel, as a function of the velocity. For dry liquid foams, the influence of the amount of liquid and of the bubble size is pointed out and we predict theoretically that this influence is closely related to the power law obtained for the force/velocity relation. This model is in fair agreement with our experimental data and provides a new interpretation of previous results.
83.50.Ha - Flow in channels.
83.80.Iz - Emulsions and foams.
83.85.Jn - Viscosity measurements.
© EDP Sciences 2006