Viscous force exerted on a foam at a solid boundary : influence of the   liquid fraction and of the bubble size
  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. 
Emmanuel Terriac (GMCM), Janine Etrillard (GMCM), Isabelle Cantat   (GMCM)