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Slow rupture of viscous films between parallel needles

  • SOFYA V. CHEPUSHTANOVA (a1) and IGOR L. KLIAKHANDLER (a1)

Abstract

Experiments and theory on the rupture of a free plane viscous film are reported. The relatively thick film, with a typical thickness of the order of 0.1–0.6 mm, rests between two long parallel needles. When the film is punctured, a hole is formed with the rim on the front. The hole expands, reaches the needles, and propagates along them with a constant velocity of the order of 2–50 cm s−1. The Reynolds numbers for the present experiments are relatively small, 0.002 ≤ Re ≤ 0.34. A crude theory for propagation velocity of the rim is proposed; the theory compares well with the experimental data. The rupture profile is visually similar to a U-shaped curve. Crude equations for the rupture profile are derived, and their solutions are consistent with the experimental observations. A theory for propagation velocity and profile of the rupture, applicable to all Reynolds numbers, is proposed.

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Slow rupture of viscous films between parallel needles

  • SOFYA V. CHEPUSHTANOVA (a1) and IGOR L. KLIAKHANDLER (a1)

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