Bubble cascade in Guinness beer is caused by gravity current instability

Bubble cascade in Guinness beer is caused by gravity current instability
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吉尼斯啤酒中的气泡级联是由重力流不稳定引起的

DOI:
10.1038/s41598-019-42094-0
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发表时间:
2019
期刊:
影响因子:
4.6
通讯作者:
Shiono Takashi
Shiono Takashi
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Watamura Tomoaki;Iwatsubo Fumiya;Sugiyama Kazuyasu;Yamamoto Kenichiro;Yotsumoto Yuko;Shiono Takashi

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一杯吉尼斯啤酒中气泡结构的向下运动是由大量小直径气泡的浮力驱动的一种迷人的流体流动。这种纹理运动是酒吧桌子上经常观察到的现象。以前已经讨论过织构形成的物理机制,但这些研究之间存在不一致。我们在倾斜容器中对健力士啤酒的气泡分布进行了实验,观察了健力士啤酒的纹理形成过程。我们还报道了在可控实验中使用精确指定直径和体积浓度的颗粒悬浮液的纹理形成。我们基于激光诱导荧光的具体测量方法提供了液相速度时空分布的细节。这种结构形成的水动力条件类似于流体膜中滚波不稳定性的临界点,这种临界点通常可以在雨天下坡的水膜中观察到。在此,我们确定了纹理形成的临界条件,并得出结论,重力流的滚波不稳定性是一杯吉尼斯啤酒中纹理形成的原因。
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 velocity. The hydrodynamic condition for the texture-formation is analogous to the critical point of the roll-wave instability in a fluid film, which can be commonly observed in water films sliding downhill on a rainy day. Here, we identify the critical condition for the texture-formation and conclude that the roll-wave instability of the gravity current is responsible for the texture-formation in a glass of Guinness beer.
DOI: 10.1038/104005b0
发表时间: 1919
期刊: Nature
影响因子: 64.8
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