Google+

Mathemantics and Beer, Who Would Have Thought

After a long day of toil and trouble, there’s nothing quite like a cold, refreshing beer. As you take your first pull from the bottle or glass, your worries immediately drift away, and as you set your vessel down, you begin to lose yourself in the effervescence of it all, just as the bubbles slowly and continually rise to the top.

That is, of course, unless you’re drinking a stout, such as the popular Irish drink of choice, Guinness.

Irish mathematicians have put their minds and glasses together to understand why Guinness bubbles sink and in the end—and several beers later—they have concluded it most likely comes down to the shape of the vessel.

By running the peculiarity of this liquid dynamic behavior through a simulator, an upward flow can be seen running up from the center of the glass as a downward flow carries the bubbles down to the bottom.

The Irish mathematicians have taken these results and have shown the simulations shift when you change the shape of the glass.

Eugene Benilov, Cathal Cummins and William Lee at the University of Limerick are the mathematicians responsible for this new research, and say the shape of the glass plays a huge part in the way the beer is circulated within.

As bubbles drift upwards, they exert drag on the liquid surrounding them. The mathematicians say this drag is higher in areas where the bubble density is greatest, such as the center of the pint glass. This creates an imbalance which sets up the famous circulation pattern where the liquid flows upwards but the bubbles fall downwards near the walls.

Benilov and company say if a Guinness is poured into a straight, perfectly cylindrical pint, there would be no imbalance and the bubbles and liquid would rise together in harmony; The bubbles would constantly be replenished from the bottom of the glass.

Mr. Cummins created some calculations to determine the effect of density and drag on these bubbles. Armed with these calculations, the team set about their research.

It was here that the team realized the shape of the glass is just as important as the calculations.

“Because of the sloping wall of the pint, the bubbles are moving away from the wall, which means you’re getting a much denser region next to the wall,” Dr. Lee explained to the BBC.

“That is going to sink under its own gravity, because it’s less buoyant, and that sinking fluid will pull the bubbles down.”

Dr. Lee said the bubbles are actually trying to rise, but the circulation within the glass creates an unsavory environment for rising.

“You’ll see sinking bubbles not because the bubbles themselves are sinking, but because the fluid is and it’s pulling them down with it.”

The team said it was much easier to study this effect in Guinness and other stout beers because of the use of nitrogen. Stouts often contain nitrogen as well as the carbon dioxide found in all beers, and as nitrogen dissolves slowly in liquids, it creates slower, longer lasting bubbles with which to study.

“One of the things we found was it’s actually very easy to see bubbles forming in stout beer rather than in, say, champagne where the bubble formation process is much more violent,” said Dr. William Lee, according to the BBC.

Just like beer, science is often more fun when it’s shared. The team say anyone can observe this behavior for themselves next time they head to the bar. The effects are best seen when a stout is served up in a straight-side, cylindrical glass, not quite filled to the top.

If the glass is tilted when the stout settles, the direction of the tilt can reflect the behavior of a normal pint glass. The opposite side of the tilt exhibits the behavior of an anti-pint glass, where the bubbles will rise and fall in the same glass.

Source: Micheal Harper RedOrbit

REQUEST INFORMATION

Entertainment

Top Ten DVD List for August 22, 2017

  This Week’s DVD Releases by Kam Williams Top Ten DVD List for August 22, 2017                       Nova: Poisoned Water [Flint, Michigan Expose'] https://www.amazon.com/exec/obidos/ASIN/B071HG59CK/ref%3dnosim/thslfofire-20 Guardians of the Galaxy, Volume 2 [Marvel Comics Superheroes Sequel] https://www.amazon.com/exec/obidos/ASIN/B06ZXWR8C5/ref%3dnosim/thslfofire-20 Supergirl: Season 2 [Woman of Steel Battles a New Set of … [Read More its Good for You.....]

Lifestyle

Girls Trip! Head to South Louisiana for Food, Fishing, and Culture

  Girls Trip! Head to South Louisiana for Food, Fishing, and Culture By Craig Lamb Ah, the New Orleans French Quarter. The sound of jazz coming from Preservation Hall. The taste of fresh beignets and café au lait at Café du Monde. Art galleries and shopping. French, Creole and Cajun cultures. It all has the makings of a girl’s getaway vacation, with a catch, and quite literally. A short drive through the scenic marshland is Home Run … [Read More its Good for You...]

Outdoors

“X” Marks the Spot for Deer Hunting in Kansas: Welcome to Xtreme Hunts

  “X” Marks the Spot for Deer Hunting in Kansas: Welcome to Xtreme Hunts   If you are looking to dive into a quality deer hunting experience in the state of Kansas, Xtreme Hunts is the place to go. Trophy whitetail deer hunts is what this company is all about. Being established in 2011, the company first came to be in Kansas because of the massive amount of encouragement that Xtreme Hunts received from their clients in Illinois; they … [Read More its Good for You...]

Sports

College Football Arriving Soon!

  College Football Arriving Soon! by Amy Lignor   Ask any college football fan and they will tell you that it seems like an eternity waiting for the season to begin. But, have no fear, the kick-off to the college season is almost here, with Colorado State and Oregon State hitting the field on Saturday, August 26th at 2:30 p.m. ET. On the same day, fans of Oregon State and Colorado State will see an active match-up, and Portland … [Read More its Good for You...]

Travel

Going Back in Time on the Ultimate Steamboat Vacation

  Going Back in Time on the Ultimate Steamboat Vacation by Amy Lignor   Many people love taking a cruise. But it is the river cruise on that glorious steamboat that not only offers all the benefits a big ocean liner offers, but also creates a more personalized, intimate vacation experience. It is a unique recipe: being able to witness stunning landscapes, mixed with amazing history, while dining on acclaimed regional cuisine and … [Read More its Good for You...]

Real Estate

Real Estate: Refinancing Rates on the Rise in 2017

  Real Estate: Refinancing Rates on the Rise in 2017 by Amy Lignor   The term ‘meteoric rise’ usually applies to something fun. Think: A Hollywood actor who has been ‘discovered.’) Unfortunately, when it comes to this article, ‘meteoric rise’ is something that will not bring a smile to one’s face. To put it simply, if you wish to refinance your home, you need to do it ASAP. If choosing to wait too much longer, homeowners across the … [Read More its Good for You.....]

Business

The New Airline Fare to Avoid: Basic Economy

  The New Airline Fare to Avoid: Basic Economy by Amy Lignor   Whether on business or going on vacation, buying airline tickets in this day and age is getting more difficult. The most recent term in airfares is “Basic Economy.” Now, all people want to nab the cheapest flight they can get in order to save money, yet even travel agencies are now scrambling to explain to their clients that “Basic Economy” may save $30 to $50 from a … [Read More its Good for You...]

Green Living

Creating the Perfect Vegetable Garden

  Creating the Perfect Vegetable Garden by Amy Lignor   Many are still dealing with that wintery mix Mother Nature just loves to toss down from the sky this time of year. Yet, that gardener living inside the soul – the one just dreaming of the sunny skies and lazy rainy days that are must-haves in order to grow the best vegetables possible – is already jotting down the facts, tricks and tips they need to know in order to make that … [Read More its Good for You...]

Books

Book of Black Heroes

  Book of Black Heroes Political Leaders Past and Present by Gil L. Robertson, IV Foreword by Myrlie Evers-Williams Just Us Books Paperback, $12.95 80 pages ISBN: 978-1-933491-21-9 Book Review by Kam Williams “The first African-American political leaders began to serve following the Civil War...Known as Reconstruction, this period represented a window of opportunity for African-Americans... Many [Black] political leaders emerged … [Read More its Good for You...]