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Comparison of several models for multi-size bubbly flows on an adiabatic experiment
Authors:Christophe Morel,Pierre Ruyer,Nathalie Seiler,Jé    me M. Lavié  ville
Affiliation:1. CEA, DEN, DER/SSTH/LMDL, 17 rue des Martyrs, F-38054 Grenoble, France;2. IRSN, DPAM/SEMCA/LEMAR, Cadarache, Bât 700, BP 3 – 13 115 Saint Paul lez Durance Cedex, France;3. IRSN DPAM/SEMCA/LEMAR, CEN Cadarache, Bât 700, 13 115 Saint Paul lez Durance Cedex, France;4. Electricité de France R&D Division, 6 Quai Watier, F-78400 Chatou, France
Abstract:This paper deals with the modelling and numerical simulation of isothermal bubbly flows with multi-size bubbles. The study of isothermal bubbly flows without phase change is a first step towards the more general study of boiling bubbly flows. Here, we are interested in taking into account the features of such isothermal flow associated to the multiple sizes of the different bubbles simultaneously present inside the flow. With this aim, several approaches have been developed. In this paper, two of these approaches are described and their results are compared to experimental data, as well as to those of an older approach assuming a single average size of bubbles. These two approaches are (i) the moment density approach for which two different expressions for the bubble diameter distribution function are proposed and (ii) the multi-field approach. All the models are implemented into the NEPTUNE_CFD code and are compared to a test performed on the MTLOOP facility. These comparisons show their respective merits and shortcomings in their available state of development.
Keywords:Bubbly flow   Multiple size   Polydisperse   MTLOOP   NEPTUNE
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