EXPERIMENTAL-STUDY OF TURBULENT BUBBLY SHEAR FLOWS

This paper in memory of Pr. Dukler summarizes a set of experiments on bubbly shear flows carried out by two groups, in Toulouse and in Lyon. Homogeneous shear flows, plane mixing layer, boundary layer on a Rat plate and sudden area expansion have been investigated, for low and mo derate void fraction. Measurements of mean liquid velocity show that t he main features of the corresponding single phase how are conserved, in particular self-similarity of the mean velocity profiles. However, the turbulent field is strongly modified. The transverse interfacial m omentum transfer has been evaluated, and proves to be dominated by ins tantaneous local forces, which are not usually taken into account in e ulerian models.