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Sinking Bubbles in Stout Beers

Lee, William, Kaar, S. and O'Brien, S. B. G. (2018) Sinking Bubbles in Stout Beers. American Journal of Physics, 86 (4). ISSN 0002-9505

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A surprising phenomenon witnessed by many is the sinking bubbles seen in a settling pint of stout beer. Bubbles are less dense than the surrounding fluid so how does this happen? Previous work has shown that the explanation lies in a circulation of fluid promoted by the tilted sides of the glass. However, this work has relied heavily on computational fluid dynamics (CFD) simulations. Here we show that the phenomenon of sinking bubbles can be predicted using a simple analytic model. To make the model analytically tractable we work in the limit of small bubbles and consider a simplified geometry. The model confirms both the existence of sinking bubbles and the previously proposed mechanism.

Item Type: Article
Additional Information: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in American Journal of Physics 86, 250 (2018) and may be found at
Subjects: T Technology > T Technology (General)
Schools: School of Computing and Engineering
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Depositing User: Sally Hughes
Date Deposited: 20 Dec 2017 09:18
Last Modified: 28 Aug 2021 14:15


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