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Liquid ropes: a geometrical model for thin viscous jet instabilities.

Author(s): Brun, P-T; Audoly, Basile; Ribe, Neil M; Eaves, TS; Lister, John R

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Abstract: Thin, viscous fluid threads falling onto a moving belt behave in a way reminiscent of a sewing machine, generating a rich variety of periodic stitchlike patterns including meanders, W patterns, alternating loops, and translated coiling. These patterns form to accommodate the difference between the belt speed and the terminal velocity at which the falling thread strikes the belt. Using direct numerical simulations, we show that inertia is not required to produce the aforementioned patterns. We introduce a quasistatic geometrical model which captures the patterns, consisting of three coupled ordinary differential equations for the radial deflection, the orientation, and the curvature of the path of the thread’s contact point with the belt. The geometrical model reproduces well the observed patterns and the order in which they appear as a function of the belt speed.
Publication Date: May-2015
Citation: Brun, P-T, Audoly, Basile, Ribe, Neil M, Eaves, TS, Lister, John R. (2015). Liquid ropes: a geometrical model for thin viscous jet instabilities.. Physical review letters, 114 (17), 174501 - ?. doi:10.1103/physrevlett.114.174501
DOI: doi:10.1103/physrevlett.114.174501
ISSN: 0031-9007
EISSN: 1079-7114
Pages: 174501 - ?
Language: eng
Type of Material: Journal Article
Journal/Proceeding Title: Physical review letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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