Abstract
This work deals with some numerical simulations concerning bubble behaviour in a 3D turbulent pipe flow. A hybrid Eulerian-Lagrangian approach is employed for the calculation of the particulate flow: Reynolds Averaged Navier-Stokes approach with a k-e realisable model for modelling the continuous fluid phase and a kinetic approach for describing the change of the bubble number density distribution function due to break-up and coalescence. For modelling the break-up and coalescence processes, we consider the models proposed by Martinez-Bazan et al. (1999a) and Kamp et al. (2001), respectively. Interfacial forces, such as drag force and transverse lift force are taken into account in the bubbles' dynamics equation. The coupling between the two-phases is considered through momentum source terms and sink terms in k and e equations. The numerical results are quantitatively compared with measurements performed by Kamp (1996), showing that profiles of void fraction, bubble size distribution and slip velocity are in fair agreement with experimental data.
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