Multifield Hybrid Approach For Bubble To
Slug Flow Transition Modelling
Author(s)
R. Denefle, S. Mimouni, J.-P. Caltagirone& S. Vincent
Abstract
This paper aims to assess a conservative interface locating method based on levelset
adapted to two fluid model for two phase flow. The objective of the work is
twofold: first to check out the prediction of the model on bubble coalescence cases
and then to introduce a first description of the multifield hybrid approach for twophase
flow modelling. The interface locating method is part of a model dedicated
to the simulation of large and distorted bubbles. At different liquid viscosities
and densities, the model yields reasonable predictions of terminal velocities and
shapes for rising bubble experiments. The overall method relies also on an existing
building block, consisting of a set of averaged models dedicated to dispersed
bubbles, which has already been validated and has given a reasonable agreement
with experimental data in cases where the spherical shape assumption is still valid
for the dispersed phase. As a consequence, we present the first step toward a
new approach consisting of modelling the small bubbles as a dispersed field and
simulating the large and distorted ones.
The main outcome is the simulation of bubble coalescence where the distortion
of the interface during the coalescence phenomena is followed. The capability to
simulate correctly coalescence phenomena is an important point of the modelling
of slug flows with interface locating methods.
Keywords: multifield model, surface tension, interface sharpening, bubble rising,
coalescence.
1 Introduction
Two-phase flows are featuring many industrial applications such as nuclear power
plants, heat exchangers and chemical reactors. Based on the interface structure,
Keywords
multifield model, surface tension, interface sharpening, bubble rising,coalescence.
Related Book
Other papers in this volume
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