Irish institutes of higher learning & science.

Rockstar · 05-30-12, 02:28 PM

Oh happy day, Irish mathematicians explain why Guinness bubbles sink (w/ video)!

http://phys.org/news/2012-05-irish-m...ess-video.html

Why do the bubbles in a glass of stout beer such as Guinness sink while the beer is settling, even though the bubbles are lighter than the surrounding liquid? That’s been a puzzling question until now, as a team of mathematicians from the University of Limerick has shown that the sinking bubbles result from the shape of a pint glass, which narrows downwards and causes a circulation pattern that drives both fluid and bubbles downwards at the wall of the glass. So it’s not just the bubbles themselves that are sinking (in fact, they're still trying to rise), but the entire fluid is sinking and pulling the bubbles down with it.

Penguin · 05-30-12, 04:21 PM

I like science. I'll drink to a dark beer to that. Cheers!

05-30-12, 02:28 PM	#1
Rockstar In the Brig Join Date: Nov 2002 Location: Zendia Bar & Grill Posts: 12,614 Downloads: 10 Uploads: 0	Irish institutes of higher learning & science. Oh happy day, Irish mathematicians explain why Guinness bubbles sink (w/ video)! http://phys.org/news/2012-05-irish-m...ess-video.html Why do the bubbles in a glass of stout beer such as Guinness sink while the beer is settling, even though the bubbles are lighter than the surrounding liquid? That’s been a puzzling question until now, as a team of mathematicians from the University of Limerick has shown that the sinking bubbles result from the shape of a pint glass, which narrows downwards and causes a circulation pattern that drives both fluid and bubbles downwards at the wall of the glass. So it’s not just the bubbles themselves that are sinking (in fact, they're still trying to rise), but the entire fluid is sinking and pulling the bubbles down with it.

05-30-12, 04:21 PM	#2
Penguin Ocean Warrior Join Date: Mar 2010 Location: Rheinische Republik Posts: 3,322 Downloads: 92 Uploads: 0	I like science. I'll drink to a dark beer to that. Cheers!