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Role of particle/particle collisions in a dilute tube flow : Analysis and experiments for mono and bi-dispersed situations.

The present paper present measurements and analysis of a bidispersed two-phase flow at low (11%) and moderate (110%) mass loading in a fully developed pipe flow. Our goal is to provide data and analysis showing unambiguously the role of inter-class collisions. The mass distribution of the mixture of particles is therefore chosen in order to promote the collisions of the large 90µm particles with 60µm glass beads. Velocity statistical moments up to the third order moments and at both mass loadings are presented and discussed. At low mass loading, it is interesting to note that the radial characteristics of the air and 60µm glass beads for a monodispersed (Caraman et al. 2003) and a bidispersed situations (present results) are very similar. Moreover, the radial turbulent transport of longitudinal and radial fluctuating kinetic stresses is much higher for the particles than for the fluid phase. Dominant effects in the flow are then (i) in the core flow a source through the interaction with the fluid turbulence, a dissipation due to the fluid drag and a transport by the third order velocity correlation.; (ii) in the near wall region a production by the mean shear for ' u p and a redistribution from the very large streamwise velocity variance via