Click For Photo: https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/2019/mysteryoftex.jpg
A team of researchers from Osaka University and Kirin Holdings Company, Limited demonstrated that the texture formation in a pint glass of Guinness beer is induced by flow of a bubble-free fluid film flowing down along the wall of the glass, a world first. This phenomenon is found to be analogous to roll waves commonly observed in water sliding downhill on a rainy day. Their research results were published in Scientific Reports.
Guinness beer, a dark stout beer, is pressurized with nitrogen gas. When it is poured into a pint glass, small-diameter bubbles (only 1/10 the size of those in carbonated drinks such as soda and carbonated water) disperse throughout the entire glass and the texture motion of the bubble swarm moves downward.
Models - Wave - Swarm - Forms - Guinness
Although some models have been proposed to explain how the downward wave of a bubble swarm forms in Guinness beer, the mechanism underlying the texture formation was an open problem.
Because the opaque and dark-colored Guinness beer obstructs physical observation in a glass, and computation using supercomputers is necessary to conduct numerical simulation of flows including a vast number of small bubbles in the beer, the team of researchers led by Tomoaki Watamura produced transparent "pseudo-Guinness fluid" by using light particles and tap water. They filmed the movement of liquid with a high-speed video camera,...
Wake Up To Breaking News!