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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN Imprimir: 1-56700-135-1

WALL EFFECTS ON THE TURBULENCE STRUCTURE AND ON THE VOID FRACTION DISTRIBUTION IN BUBBLY FLOWS

Resumo

We apply a two-fluid model with a second order closure of the turbulence in the simulation of wall bounded bubbly flows. We analyse the interfacial effects on the turbulence structure and we evaluate the role of the turbulence and of the interfacial forces on the void fraction distribution near the wall. The simulation of the pipe bubbly flow in micro-gravity condition shows that the turbulent contributions issued from the added mass force play an important role in the phase distribution phenomenon. In normal gravity, the simulations of boundary layer and pipe bubbly flows allow to adjust the lift force model in which we take into account the wall interaction effect.
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