NUMERICAL SIMULATION OF THE RISE OF TWO PARALLEL UNEQUAL BUBBLES IN A VISCOELASTIC FLUID
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Published:2024
Issue:2
Volume:36
Page:1-27
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ISSN:0276-1459
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Container-title:Multiphase Science and Technology
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language:en
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Short-container-title:MultScienTechn
Author:
Liu Zhuang,Li Shaobai,Ji Jingbo
Abstract
The interaction of two parallel unequal bubbles in a viscoelastic fluid is investigated numerically
using OpenFoam, the volume of fluid method (VOF) combined with a surface tension model to
trace the gas-liquid interface, and the Giesekus model to characterise the rheological properties of the
fluid. The numerical results are in good agreement with experimental results from the literature. The
effects of bubble diameter, initial spacing between bubbles and rheological properties of the fluid on
the rise, and separation and convergence of the two bubbles are investigated. The flow field properties
and viscoelastic stress distribution around the bubbles are explored. As the bubble spacing increases,
the maximum and terminal velocities of the two bubbles increase, and the relative positions of the
bubbles change when they come into contact. As the relaxation time λ increases, the contact time of
the bubbles decreases, and the small bubbles tend to have an inverted teardrop shape and the large
bubbles have less deformation and no sharp tail. The relaxation time directly affects the accumulation
of viscoelastic stress, leading to changes in the velocity of the bubbles at contact, and their maximum
and terminal velocities increase. Bubbles in highly elastic fluids are more prone to negative wake
phenomena.
Subject
General Engineering,Condensed Matter Physics,Modeling and Simulation
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