A new flooding mechanism is explored for porous tube feed systems based on the concept that flow reversal takes place inside the liquid film at the feed location. The model is developed, assuming that the flow field in the liquid film at any axial position can be represented by the time-average film thickness existing there. Thus, it makes the radical assumption that the interfacial waves exert their influence only by modifying the shear stress in the gas flowing over the film. A 2-D numerical simulation was constructed which solved for both the flow field inside the film and the shape of the free interface. The numerical results show that this film mechanism is a viable approach for modeling flooding, as reasonable values of the interfacial shear stress from the upward gas flow can reproduce the experimentally measured film thickness. This work also suggests that the pressure gradient developed inside the entry is only partially due to interfacial shear. Gas-phase accelerations, due to the wave motion, contribute the remainder of the measured pressure gradient.