Glugging

{{Short description|Phenomenon which occurs when a liquid is poured from a vessel with a narrow opening}}

{{redirect|Glug|the non-profit organization|Linux user group|the Sydney theatre awards|Glugs Theatrical Awards}}

{{use dmy dates|date=October 2021}}{{use British English|date=October 2021}}

file:wine exiting a blue bottle.jpg

{{listen| filename = Uncorking and first pour of Wild Turkey 101 bottle - 2021-10-15 - Andy Mabbett.mp3 |title = Uncorking and pouring |type = |description = Uncorking, first pour, and re-corking of a 70cc bottle of Bourbon whiskey. During the pour, glugging can be heard. }}

Glugging (also referred to as "the glug-glug process"{{cite journal |last1=Mer |first1=Samuel |last2=Praud |first2=Olivier |last3=Neau |first3=Herve |last4=Merigoux |first4=Nicolas |last5=Magnaudet |first5=Jacques |last6=Roig |first6=Veronique |title=The emptying of a bottle as a test case for assessing interfacial momentum exchange models for Euler–Euler simulations of multi-scale gas-liquid flows |journal=International Journal of Multiphase Flow |date=September 2018 |volume=106 |pages=109–124 |doi=10.1016/j.ijmultiphaseflow.2018.05.002|bibcode=2018IJMF..106..109M |s2cid=126045682 |url=https://hal.archives-ouvertes.fr/hal-01801495/file/mer_20029.pdf }}) is the physical phenomenon which occurs when a liquid is poured rapidly from a vessel with a narrow opening, such as a bottle.{{cite journal |last1=Clanet |first1=Christophe |last2=Searby |first2=Geoffrey |title=On the glug-glug of ideal bottles |journal=Journal of Fluid Mechanics |date=10 July 2004 |volume=510 |pages=145–168 |doi=10.1017/S002211200400936X|bibcode=2004JFM...510..145C |s2cid=59064702 }}{{cite AV media |people=Harvard John A. Paulson School of Engineering and Applied Sciences |date=29 June 2016 |title='Glugging' explained |type= |url=https://www.youtube.com/watch?v=eoiWD93LwUY |access-date=16 October 2021 |format=YouTube video |time= |location= |publisher= }} It is a facet of fluid dynamics.

As liquid is poured from a bottle, the air pressure in the bottle is lowered, and air at higher pressure from outside the bottle is forced into the bottle, in the form of a bubble, impeding the flow of liquid. Once the bubble enters, more liquid escapes, and the process is repeated. The reciprocal action of glugging creates a rhythmic sound.{{cite web |author=American Institute of Physics |title=Glug, Glug: Physics of Bubble Dynamics Reveals How to Empty Bottles Faster |url=https://scitechdaily.com/glug-glug-physics-of-bubble-dynamics-reveals-how-to-empty-bottles-faster/ |website=SciTechDaily |access-date=16 October 2021 |date=7 April 2020}} The English word "glug" is onomatopoeic, describing this sound.{{cite web |title=glug |url=http://onomatopoeialist.com/glug/ |website=Onomatopoeia List |access-date=16 October 2021 |date=10 August 2013}} Onomatopoeias in other languages include {{lang|de|Gluckern}} (German).

Academic papers have been written about the physics of glugging,{{cite journal |last1=Omilinsky |first1=Ba |last2=Lindsay |first2=Ad |title=Container Design and 'Glug' |journal=Pesticide Formulations and Application Systems |volume=12 |date=1 January 1993 |pages=235–235–9 |doi=10.1520/STP20197S|isbn=978-0-8031-1439-5 }} and about the impact of glugging sounds on consumers' perception of products such as wine.{{cite book |last1=Wang |first1=Qian Janice |last2=Spence |first2=Charles |chapter=Sonic Packaging: How Packaging Sounds Influence Multisensory Product Evaluation |title=Multisensory Packaging: Designing New Product Experiences |date=2019 |pages=103–125 |doi=10.1007/978-3-319-94977-2_5|isbn=978-3-319-94976-5 |s2cid=70214647 }}{{cite book |last1=Smith |first1=Barry C. |title=Questions of Taste: The Philosophy of Wine |date=2007 |publisher=Oxford University Press |isbn=978-0-19-533146-2 |page=53 }} Research into glugging has been done using high-speed photography.

Factors which affect glugging are the viscosity of the liquid, its carbonation, the size and shape of the container's neck and its opening (collectively referred to as "bottle geometry"), the angle at which the container is held, and the ratio of air to liquid in the bottle (which means that the rate and the sound of the glugging changes as the bottle empties).