Model Explains the Sinking of Bubbles in Guinness
Phil Kinnane | June 11, 2012
Before you drink your next pint of Guinness, have a close look at the bubbles in the brew, and see if they sink. Apparently they do. Now a group of scientists from the University of Limerick in Ireland (where else?) has modeled the phenomenon of sinking bubbles in Guinness beer to lend weight to this finding and provide a theoretical explanation.
The fluid flow vector and (streamlines) and
fluid fraction in a typical and an atypical pint
glass. The traditional shape is responsible for
the downward flow of gas bubbles.
Image courtesy: E. S. Benilov, C. P. Cummins,
W. T. Lee, University of Limerick, Ireland.
As reported by the BBC News site, the modeling indicates that the shape of the glass is an important factor. As the bubbles, which contain nitrogen and therefore very small, rise through the length of the glass their distance from the wall increases.
This creates a denser region of liquid beer close to the wall, which sinks, and the movement of this sinking liquid drags the small beer bubbles with it. It’s a great piece of work and you can see an animation of their model of sinking bubbles, while reading their research here. Take it with you for a read the next time you go for a pint.
Follow-Up on Venus Transit of the Sun 2012
Another Danger with Corrosion
- Certified Consultants 30
- Chemical 48
- COMSOL Now 136
- Conference 103
- Core Functionality 59
- Electrical 118
- Fluid 86
- Interfacing 36
- Mechanical 142
- Multipurpose 14
- Tips & Tricks 32
- Trending Topics 44
- User Perspectives 82
- Video 64