# Flow and Jamming of 2D foams

Condensed Matter lunchtime seminar

#### Flow and Jamming of 2D foams

• Event time: 1:00pm
• Event date: 16th February 2009
• Speaker: Gijs Katgert (Leiden University The Netherlands)
• Location: Room 2511,

### Event details

I will discuss experiments on bidisperse, disordered monolayers of foam bubbles, floating on a surfactant solution and confined by a glass plate. First I will present results on the linear shear of this system. I will show that the averaged features, such as the velocity profiles can be well understood by considering the viscous forces in the system. I will further present data on the localisation of the velocity profiles as a function of the packing fraction. I will then turn to static packings, in which we again vary the packing fraction of the bubbles and extract various measures that indicate that the foam exhibits a jamming transition at a critical packing fraction $\phi_c=0.842$.

### About Condensed Matter lunchtime seminars

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..