  We study the flow of a pressure-driven foam through a straight channel using
numerical simulations, and examine the effects of a tuneable attractive
potential between bubbles. This potential, which accounts for the effects of
disjoining pressure in the liquid films between separating bubbles, is shown
here to introduce jamming and stick-slip flow in a straight channel. We report
on the behaviour of these new regimes by varying the strength of the attractive
potential. It is seen that there is a force threshold below which the flow
jams, and on increasing the driving force, a cross over from intermittent
(stick-slip) to smooth flow is observed. This threshold force below which the
foam jams increases linearly with the strength of the attractive potential. By
examining the spectra of energy fluctuations, we show that stick-slip flow is
characterized by low frequency rearrangements and strongly local behaviour,
whereas steady flow shows a broad spectrum of energy drop events and collective
behaviour. Our work suggests that the stick-slip and the jamming regimes occur
due to the increased stabilization of contact networks by the attractive
potential - as the strength of attraction is increased, bubbles are
increasingly trapped within networks, and there is a decrease in the number of
contact changes.
