Document Detail

Soap films burst like flapping flags.
MedLine Citation:
PMID:  19792505     Owner:  NLM     Status:  PubMed-not-MEDLINE    
When punctured, a flat soap film bursts by opening a hole driven by liquid surface tension. The hole rim does not, however, remain smooth but soon develops indentations at the tip of which ligaments form, ultimately breaking and leaving the initially connex film into a mist of disjointed drops. We report on original observations showing that these indentations result from a flaglike instability between the film and the surrounding atmosphere inducing an oscillatory motion out of its plane. Just like a flag edge flaps in the wind, the film is successively accelerated on both sides perpendicularly to its plane, inducing film thickness modulations and centrifuging liquid ligaments that finally pinch off to form the observed spray. This effect exemplifies how the dynamics of fragile objects such as thin liquid films is sensitive to their embedding medium.
Henri Lhuissier; Emmanuel Villermaux
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Publication Detail:
Type:  Journal Article     Date:  2009-07-28
Journal Detail:
Title:  Physical review letters     Volume:  103     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-10-01     Completed Date:  2009-10-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  054501     Citation Subset:  -    
Aix-Marseille Université, IRPHE, 13384 Marseille Cedex 13, France.
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