Journal
EUROPHYSICS LETTERS
Volume 52, Issue 5, Pages 532-538Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2000-00470-4
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We consider the nonlinear folding behavior of a viscous filament or a sheet under the influence of an external force such as gravity. Everyday examples of this phenomenon are provided by the periodic folding of a sheet of honey as it impinges on toast, or the folding of a stream of shampoo as it falls on one's hand. To understand the evolution of a fold, we formulate and solve a free-boundary problem for the phenomenon, give scaling laws for the size of the folds and the frequency with which they are laid out, and verify these experimentally.
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