BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Failure Mode of Bubble Rafts under Tension - Dennin\, M (UC Irvine
 )
DTSTART:20140224T163500Z
DTEND:20140224T170000Z
UID:TALK51043@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-author: Chin Chang Kuo (UC Irvine) \n\nOne of the interesti
 ng questions regarding the dynamics of foam is the characterization of the
 ir flow behavior. One often refers to distinct regimes in which the foam e
 xhibits a primarily elastic response (solid-like) or it exhibits a primari
 ly viscous response (fluid-like). In addition\, one finds plastic flow reg
 imes and various combinations of all three. Any attempt to provide a unifi
 ed theoretical description of foam rheology must account for a wide-range 
 of flow geometries and behavior. Most of the focus in flowing foam has bee
 n on closed geometries in which the system is driven either by a moving bo
 undary or pressure gradient. We have recently completed a series of studie
 s on the dynamics of foam in an open-flow situation in which the system is
  under tension. We use a quasi-two dimensional system of bubbles on the su
 rface of water (bubble rafts). Two of the opposite sides of the system are
  free boundaries\, and the other two sides are pulled apart at a constant 
 rate. We f ocus on the failure mechanism by which the system separates in 
 distinct sections of foam. We report on the different regimes that were ob
 served\, including fluid-like pinch-off and plastic-like fracture. We prop
 ose simple scaling arguments to account for the speed and aspect ratio dep
 endence of the different failure modes.\n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR