Shear-Induced “Melting” of an Aqueous Foam

Investigation of shear banding in three-dimensional foams

“…First, Da Cruz et al [9] report a 200 s −1 preshear; we observe that applying such high shear rate to the Gillette NR foam with the geometry used in [9] leads to expelling a large amount of the material from the gap by inertial forces (this happens for shear rates higher than 30 s −1 ); therefore the protocol was inappropriate, leading to incorrect rheological data. Then the yield stress reported is ≈180 Pa, a value much higher than values reported in the literature [14,27,31]. This would mean that the material on which the measurements were performed in [9] was not what it was supposed to be.…”

An arbitrary Lagrangian–Eulerian method for simulating bubble growth in polymer foaming

“…Although a wide range of materials can be foamed, including 0021-9991/$ -see front matter Ó 2007 Elsevier Inc. All carbon, ceramics and metals [2][3][4], aqueous foams and polymer foams are the most common. Aqueous foams have received much attention as a prototypical soft matter, and a more or less coherent understanding has taken shape on their structure, deformation and microrheology [5][6][7]. Polymer foams, on the other hand, are used in the solid state.…”

Rheological behavior of oil-based drilling foams

“…A number of experimental and theoretical studies (David and Marseden, 1968;Harris, 1989;Eren, 2004;Debr egeas et al, 2001;Gopal and Durian, 1998) have examined the relationship between bubble size and rheological properties of foams. Under dynamic (flowing) condition, one of the main factors that affect the bubble size is the shear rate that is applied.…”