Soap Films Burst Like Flapping Flags
نویسندگان
چکیده
منابع مشابه
Soap films burst like flapping flags.
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...
متن کاملAnomalous hydrodynamic drafting of interacting flapping flags.
In aggregates of objects moving through a fluid, bodies downstream of a leader generally experience reduced drag force. This conventional drafting holds for objects of fixed shape, but interactions of deformable bodies in a flow are poorly understood, as in schools of fish. In our experiments on "schooling" flapping flags, we find that it is the leader of a group who enjoys a significant drag r...
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The performance of recently proposed flag-based energy harvesters is strongly limited by the chaotic response of flags to strong winds. From an experimental point of view, the detection of flag chaotic dynamics were scarce, based on the flapping amplitude and the maximal Lyapunov exponent. In practice, tracking the flapping amplitude is difficult and flawed in the large oscillation limit. Also,...
متن کاملComments on ”Anomalous Hydrodynamic Drafting of Interacting Flapping Flags”
We make remarks on Ristroph and Zhang’s [Phys. Rev. Lett. 101, 194502 (2008)] paper. We argue especially that due to the interferences the calibration procedures in [1] were not complete and this will induce some measurements’ error. Ristroph and Zhang just presented an interesting observation about the inverted drag relationship for 6 tandem flags where inverted drafting directly suggests hydr...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2009
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.103.054501