Convective instability in foam drainage
Department of Physics, Trinity College,
University of Dublin, Dublin, Ireland
Accepted: 17 December 1997
The use of a column of steadily drained foam as a sample of wet foam is limited by flow instability as the liquid fraction is increased. We report a study of this instability, which takes the form of a convective roll of bubble motion at a value of liquid fraction roughly half that of the wet foam limit at which a static wet foam becomes unstable.
PACS: 82.70.Rr – Aerosols and foams / 47.60.+i – Flows in ducts, channels, nozzles, and conduits / 47.20.Ky – Nonlinearity (including bifurcation theory)
© EDP Sciences, 1998