Only recently has Eulerian two-fluid modeling been considered for describing dispersed flows in chemical contactors. The most significant contribution, made by Attou et al. (1999) provided substantial improvement in the understanding of the origin of pressure drop. However, it happens that the mechanical balances as well as the closure laws proposed by these authors need to be reconsidered. Based on the hybrid approach, a new 1-D model has been derived that leads to a new equilibrium for the gas phase. By revisiting available data on pressured drop and void fraction, and using new experimental evidence gathered on bubble size and velocities, new closures are proposed for the gas–liquid interfacial momentum transfer. Refined experiments at higher gas flow rates are needed to fully validate these proposals.