BUBBLE JUGGLE: Bubbles are amazingly stable creatures. Sticking bubbles of
equal size together to create an ordered foam structure and make these structures
flow through channels of appropriate geometries gives rise to very beautiful
experiments which allow us to study rheological properties of foam flow in
a very systematic way. Using ferrofluids as the continuous medium of the
foam adds an interesting variety of possibilities of remote manupulation
and detection of these structures. I will present some experiments, simulations
and theoretical models which we consider as first steps on the way to
the application of ferrofluid foam flow in the field of micro-fluidics and
Lab-on-a-Chip technologies.
WIGGLY WORMS: On the way to an understanding of the dynamics of and in foams
one encounters a variety if instabilities. Of particular interest to us at
the moment is the instability of a jet of soap solution flowing down between
two vertical glass plates. As simple as the system seems, it displays a number
of very surprising properties...