Bubble growth in viscous newtonian and non-newtonian liquids

A model for the dynamics of hydrodynamically controlled spherical bubble growth in quiescent viscous newtonian and non-newtonian liquids is presented. Two constitutive equations were used to describe the behavior of the liquid medium: (1) a simple power law relation and (2) a truncated power law. Ap...

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Bibliographic Details
Published in:The Chemical engineering journal and the biochemical engineering journal 1996-09, Vol.63 (3), p.149-155
Main Authors: Favelukis, Moshe, Albalak, Ramon J.
Format: Article
Language:English
Subjects:
Applied sciences
Bubble growth
Chemical engineering
Exact sciences and technology
Hydrodynamics of contact apparatus
Newtonian liquids
Non-newtonian liquids
Viscosity
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Summary:A model for the dynamics of hydrodynamically controlled spherical bubble growth in quiescent viscous newtonian and non-newtonian liquids is presented. Two constitutive equations were used to describe the behavior of the liquid medium: (1) a simple power law relation and (2) a truncated power law. Application of the truncated power law resulted in four differen cases: (a) at all times the liquid acts as a newtonian liquid; (b) at all times the liquid behaves as a simple power law liquid; (c) at all times the liquid close to the growing bubble obeys a power law relation and the liquid far away from the bubble behaves as a newtonian liquid; (d) all the liquid initially behaves as a newtonian liquid and at some time transforms to a two-region liquid. Analytical expressions were derived for bubble growth as a function of dimensionless system parameters. The relevance of this work to the process of polymer devolatilization is discussed.
ISSN:0923-0467
1873-3220
DOI:10.1016/S0923-0467(96)03119-3