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智科眼: 双语看懂新科研
首页 中国TOP论文 Nature Science JACS AngewChem PRL AdvMater Lancet Cell EnglMed JAMA
Bubble cascade in Guinness beer is caused by gravity current instability
泡泡级联 in 吉尼斯啤酒是造成 by 重力电流不稳定
Tomoaki Watamura; Fumiya Iwatsubo; Kazuyasu Sugiyama; Kenichiro Yamamoto; Yuko Yotsumoto; Takashi Shiono
  • Sci Rep volume:9,issue:1 [全文下载] 扫码分享
  • 影响因子: 4.1 点击(54) 收藏(0) 评分(0)
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  • 综合科学
  • 在一杯吉尼斯啤酒中,气泡质地的向下运动是由大量小直径气泡的浮力驱动的迷人流体流动。这种纹理运动是酒吧桌上经常出现的现象。先前已经讨论了纹理形成的物理机制,但是这些研究之间存在不一致性。我们对倾入容器中的吉尼斯的气泡分布进行了实验,并观察了纹理是如何形成的。我们还报告了使用具有精确指定直径和体积浓度的颗粒悬浮液在可控实验中的纹理形成。我们基于激光诱导荧光的特定测量方法提供了液相速度的时空分布的细节。纹理形成的流体动力学条件类似于流体膜中的滚波不稳定性的临界点,这通常可以在雨天下坡滑动的水膜中观察到。在这里,我们确定纹理形成的临界条件,并得出结论,重力电流的滚波不稳定性是造成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.
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