Arthur T Knackerbracket has found the following story:
Bottle emptying is a phenomenon most of us have observed while pouring a beverage. Researchers from the Indian Institute of Technology Roorkee discovered how to make bottles empty faster, which has wide-ranging implications for many areas beyond the beverage industry.
Bubbles have been studied extensively for centuries, including early efforts by Leonardo da Vinci who famously noted the sinusoidal rise of bubbles within a pool. The growth dynamics of bubbles at the mouth of a bottle depend on the thermophysical properties of the fluid, the bottle geometry and its angle of inclination. These inextricably intertwined parameters have made bottle-emptying dynamics the next frontier for bubble physicists.
In this week's Physics of Fluids, Lokesh Rohilla and Arup Kumar Das explore this bottle-emptying phenomenon from the perspective of bubble dynamics on a commercial bottle by using high-speed photography. Image analysis allowed them to conceptualize various parameters, such as liquid film thickness, bubble aspect ratio, rise velocity and bottle emptying modes.
[...] "Our experiments suggest there is a critical angle of inclination, after which any further increase in the inclination of the bottle won't lead to further reduction in the bottle emptying time," said Rohilla. "This occurs due to the saturation of the voidage, space occupied by air within liquid surrounding, at the bottle's mouth with the angle of inclination."
-- submitted from IRC
More information: "Fluidics in an emptying bottle during breaking and making of interacting interfaces," Physics of Fluids (2020). DOI: 10.1063/5.0002249
(Score: 0) by Anonymous Coward on Thursday April 09 2020, @05:46AM (2 children)
Make another hole at the top?
See also: https://www.thenakedscientists.com/get-naked/experiments/fastest-way-empty-bottle [thenakedscientists.com]
p.s. making it extremely empty as in no drops of liquid left will be a harder problem to solve economically, so I'm assuming a similar level of emptiness as what you'd get from conventional pouring.
(Score: 0) by Anonymous Coward on Thursday April 09 2020, @03:09PM
Give a bottle of beer to ET and watch the vacuum effect in action.
(Score: 1) by nitehawk214 on Thursday April 09 2020, @03:26PM
Kids in college shotgunning beer figured this out ages ago.
"Don't you ever miss the days when you used to be nostalgic?" -Loiosh
(Score: 2) by Snotnose on Thursday April 09 2020, @05:54AM (4 children)
You pour it so it flows evenly, instead of bubbling. I figured this out in high school. In college I learned you could cut a hole in the bottom so it, um, flows evenly instead of bubbling.
Then again I didn't RTFA, nor did I WTFA, so I could be pulling things out of my ass.
When the dust settled America realized it was saved by a porn star.
(Score: 5, Insightful) by aiwarrior on Thursday April 09 2020, @08:22AM
You are talking about laminar flow with no choking at the neck. The study found that there is a critical angle that the uneven flow with bubbles is the fastest discharge method. As they modeled it they probably even can tell you the angle based on viscosity, neck geometry etc. Neat
(Score: 0) by Anonymous Coward on Thursday April 09 2020, @09:03AM (2 children)
You give it a good swirl to get away from the bubbles.
(Score: 2, Interesting) by pTamok on Thursday April 09 2020, @01:32PM (1 child)
This is the generic method for emptying bottles quickly: as you say, give it a good swirl, so you get a vortex formed in the neck: air can then enter the bottle up the centre of the vortex while the liquid flows down around the vortex.
Alternatively, get a drinking straw with a bendy end, put the long end in the bottle, and bend the straw in a 'U'-shape, then pour while holding the straw in place. By providing a path into the bottle unrestricted by liquid, the liquid flows out [i]surprisingly[/i] quickly.
(Score: 1) by pTamok on Friday April 10 2020, @09:24AM
I hate to say it, but if you wish to see how effective this technique is, search for "beer chug straw" on YouTube.
Alternatively, find out experimentally for yourself with a flexible straw and a several refills of a bottle of water. Time how long it takes to empty the bottle unswirled and upended; unswirled and poured carefully so that it doesn't 'glug', swirled (with vortex), and with U-bent straw.
(Score: 5, Funny) by Bot on Thursday April 09 2020, @08:10AM
You empty bottles faster by putting better wine in it, as extensive empirical evidence in my region proves, duh.
Account abandoned.
(Score: 0) by Anonymous Coward on Thursday April 09 2020, @04:57PM
Maybe they can figure out how to speed this thing up [wikipedia.org].