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Comments on a Ruptured Soap Film

Culick, F. E. C. (1960) Comments on a Ruptured Soap Film. Journal of Applied Physics, 31 (6). pp. 1128-1129. ISSN 0021-8979. doi:10.1063/1.1735765.

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Subsequent to puncturing at a point, a horizontal soap film develops a hole whose edge, owing to surface tension, propagates outward from the point of puncture at apparently constant velocity. Measurements by Ranz [1] yielded results roughly 10% lower than those calculated on the basis of a simple energy conservation suggested by Rayleigh [2]. The discrepancy was attributed to an additional retarding viscous stress not included in the analysis. It appears, however, that the energy balance quoted [1] neglects an important contribution, indeed related to th viscous effect noted by Ranz, but which reduces the calculated values to 20% below those measured. A more detailed analysis of the motion of the edge gives this result; the neglected contribution arises from inelastic acceleration of the undisturbed fluid up to the velocity of the edge. The concomitant loss in mechanical energy may be identified with viscous dissipation which is estimated to be confined to a relatively thin region. Lack of agreement between calculated and measured values of the edge velocity seems to be causes by a second-order effect in the method used [1] to determine the thickness of the film.

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Additional Information:Copyright © 1960 American Institute of Physics. Received January 5, 1960.
Issue or Number:6
Record Number:CaltechAUTHORS:CULjap60
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10315
Deposited By: Archive Administrator
Deposited On:23 Apr 2008
Last Modified:08 Nov 2021 21:06

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