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The effect of viscoelasticity on a rising gas bubble

Lind, Steven John and Phillips, Timothy Nigel 2010. The effect of viscoelasticity on a rising gas bubble. Journal of non-Newtonian fluid mechanics 165 (15-16) , pp. 852-865. 10.1016/j.jnnfm.2010.04.002

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This paper investigates the role of viscoelasticity on the dynamics of rising gas bubbles. The dynamics of bubbles rising in a viscoelastic liquid are characterised by three phenomena: the trailing edge cusp, negative wake, and the rise velocity jump discontinuity. There is much debate in the literature over the cause of the jump discontinuity, which is observed once the bubble exceeds a certain critical volume. In this paper, the employment of some choice modelling assumptions allows insights into the mechanisms of the jump discontinuity which cannot be ascertained experimentally. The ambient fluid is assumed incompressible and the flow irrotational, with viscoelastic effects included through the stress balance on the bubble surface. The governing equations are solved using the boundary element method. Some Newtonian predictions are discussed before investigating the role of viscoelasticity. The model predicts the trademark cusp at the trailing end of a rising bubble to a high resolution. However, the irrotational assumption precludes the prediction of the negative wake. The corresponding absence of the jump discontinuity supports the hypothesis that the negative wake is primarily responsible for the jump discontinuity, as mooted in previous studies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Subjects: Q Science > QA Mathematics
Uncontrolled Keywords: Viscoelasticity ; Rising bubbles ; Cusp ; Velocity jump discontinuity
Publisher: Elsevier
ISSN: 0377-0257
Last Modified: 04 Jun 2017 02:47

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