Non-continuous Froude number scaling for the closure depth of a cylindrical cavity

Details Non-continuous Froude number scaling for the closure depth of a cylindrical cavity Non-continuous Froude number scaling for the closure depth of a cylindrical cavity

2006-12-20

arxiv.org/abs/cond-mat/0612530v1

Phys. Rev. Lett. 100, 084502 (2008)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.100.084502

A long, smooth cylinder is dragged through a water surface to create a cavity with an initially cylindrical shape. This surface void then collapses due to the hydrostatic pressure, leading to a rapid and axisymmetric pinch-off in a single point. Surprisingly, the depth at which this pinch-off takes place does not follow the expected Froude$^{1/3}$ power-law. Instead, it displays two distinct scaling regimes separated by discrete jumps, both in experiment and in numerical simulations (employing a boundary integral code). We quantitatively explain the above behavior as a capillary waves effect. These waves are created when the top of the cylinder passes the water surface. Our work thus gives further evidence for the non-universality of the void collapse.

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