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Guinness bubbles

  1. Aug 11, 2006 #1
    How is it that the bubbles in my favorite beverage sink, unlike any other beer. After a couple minutes of research I found that the bubbles rise in the center of the pint glass but they fall along the edges which is what you see. I understand this principle with heat convection, but not with bubbles!!!! What's going on here?

    All wrong answers owe me a fresh pint. (for experimental purposes):rofl:
     
  2. jcsd
  3. Aug 11, 2006 #2

    Mk

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    Why do raisons do the same thing when champagne is poured into a glass with raisons in it?
     
  4. Aug 12, 2006 #3
    Yeah but raisins are heavier than the champagne......
    The bubbles seem to go down way after the pour, when i can't imagine there is still that much turbulence in the beer.
     
  5. Aug 13, 2006 #4
    If bubbles rise to the top it creates a current moving up in the beer. For there to be a current going up there must be an equal current flowing down.
     
  6. Aug 13, 2006 #5
    here is a page by the group in Stanford who along with researchers in Edinburgh who did the experimental work which
    a) demonstrates that the bubbles really do go down due to a drag force as mentioned by GOD_AM.
    b) links to an article to the researcher who devised the mathmatical model explain the mechanism involved.

    what i think is great is that this is not a property of guiness inherently, it is a property of any draught fow beers.... which i always take an oportunity to order just because most tend to be tasty and are so much fun to watch....

    so here is the link with out further ado:
    http://www.stanford.edu/group/Zarelab/guinness/index.html
     
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