Bubble cascade in Guinness beer is caused by gravity current instability.

ABSTRACT: The downward movement of the bubble-texture in a glass of Guinness beer is a fascinating fluid flow driven by the buoyant force of a large number of small-diameter bubbles. This texture motion is a frequently observed phenomenon on pub tables. The physical mechanism of the texture-formation has been discussed previously, but inconsistencies exist between these studies. We performed experiments on the bubble distribution in Guinness poured in an inclined container, and observed how the texture forms. We also report the texture-formation in controllable experiments using particle suspensions with precisely specified diameters and volume-concentrations. Our specific measurement methods based on laser-induced-fluorescence provide details of the spatio-temporal profile of the liquid phase veloc

SUBMITTER: Watamura T 

PROVIDER: S-EPMC6450914 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature