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 moderate void fraction. Measurements of mean liquid velocity show that the 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 momentum transfer has been evaluated, and proves to be dominated by instantaneous local forces, which are not usually taken into account in eulerian models.