Wall effects on the void fraction distribution in bubbly flows

On the basis of numerical simulations of bubbly flows, we evaluated the rol e of turbulence and interfacial forces in the void fraction distribution ne ar the wall. The simulations of pipe pow in micro-gravity situations show t hat the turbulent contributions issued from the added mass force play an im portant role in the phase distribution phenomenon. In normal gravity, the s imulations of the boundary layer and pipe bubbly flows allow us to adjust t he lift force model in which we take into account the wall interaction effe ct. (C) Academie des Sciences/Elsevier Paris.