Coarsening driven transport of gas in steady-state foam

An experiment is performed to investigate the transport of gas through coarsening in a column of aqueous foam. The foam is maintained in a steady state by a constant flux of gas at the bottom. The liquid-fraction and bubble-size profiles are measured vertically in the sample. The results show that the liquid fraction profile in the steady state foam departs from the equilibrium capillary profile for constant bubble size. We compare the data to predictions of the coarsening equation computed in steady state together with the no-drainage condition.