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Slug flow is encountered frequently during multiphase fluid
transport in pipes. The gas entrainment process at a slug front
significantly affects the hydrodynamic behaviour of slug
flows. Due to the complexity of the flow physics and the
dynamic coupling of the affecting factors, the mechanism by
which these factors contribute to the gas entrainment process
is not clearly understood. Typical factors affecting the gas
entrainment are pipe inclination, Taylor bubble propagation
and liquid film. Current experiments are not able to clarify the
effect of these factors on the flow characteristics of slugs.
Hence, a computational fluid dynamics based numerical
method is applied in this paper to simulate the gas entrainment
process at the slug front. The objective is to investigate the
factors affecting the gas entrainment. A 2D numerical model
is created using a commercial CFD package Star-CCM+. To
capture the dynamic behaviour of liquid-gas interface at the
slug front, the volume of fluid (VOF) model with relatively
fine mesh and small time step is used. The simulation results
show that the turbulent kinetic energy at the slug front is
closely related to the gas entrainment rate. The effects of pipe
inclination, Taylor bubble propagation and liquid film flow
parameters on the turbulent kinetic energy generation and gas
entrainment process at the slug front are also discussed.
Keywords: CFD, slug flow, gas entrainment, two-phase
flow, VOF method.

Author Name: 
Jinsong HUA
Martin FOSS
Author Company: 
Institute for Energy Technology, PO Box 40, NO-2027 Kjeller, NORWAY
NTNU Department of Chemical Engineering, 7491 Trondheim, NORWAY
Conference Location: 
Trondheim, NORWAY
Conference Proceeding PDF: 
Conference Date: 
Tuesday, June 17, 2014
Conference Name: 
International Conference on CFD in Oil & Gas, Metallurgical and Process Industries