Academic Journals Database
Disseminating quality controlled scientific knowledge

CFD Simulation of Polydispersed Bubbly Two-Phase Flow around an Obstacle

Author(s): E. Krepper | P. Ruyer | M. Beyer | D. Lucas | H.-M. Prasser | N. Seiler

Journal: Science and Technology of Nuclear Installations
ISSN 1687-6075

Volume: 2009;
Date: 2008;
Original page

This paper concerns the model of a polydispersed bubble population in the frame of an ensemble averaged two-phase flow formulation. The ability of the moment density approach to represent bubble population size distribution within a multi-dimensional CFD code based on the two-fluid model is studied. Two different methods describing the polydispersion are presented: (i) a moment density method, developed at IRSN, to model the bubble size distribution function and (ii) a population balance method considering several different velocity fields of the gaseous phase. The first method is implemented in the Neptune_CFD code, whereas the second method is implemented in the CFD code ANSYS/CFX. Both methods consider coalescence and breakup phenomena and momentum interphase transfers related to drag and lift forces. Air-water bubbly flows in a vertical pipe with obstacle of the TOPFLOW experiments series performed at FZD are then used as simulations test cases. The numerical results, obtained with Neptune_CFD and with ANSYS/CFX, allow attesting the validity of the approaches. Perspectives concerning the improvement of the models, their validation, as well as the extension of their applicability range are discussed.
Why do you need a reservation system?      Affiliate Program