ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Previously the instability of an annular jet [Proceedings of the 2nd International Colloquium on Drops and Bubbles, Monterey, California, 1981, edited by D. H. LeCroissette (Jet Propulsion Laboratory, Pasadena, CA, 1982), pp. 79–87; Phys. Fluids 29, 2086 (1986)] by a theoretical model [Phys. Fluids 29, 2076 (1986)] was described, in which the liquid layer of the jet is treated as a thin liquid sheet. Although the results are reasonable, the model is not completely satisfactory because certain discontinuities in the system occur as the jet collapses. In this study it is proposed that there is a missing piece of physics there, namely, that when the envelope is closing its bottleneck during collapsing the new envelope must experience a sharp pressure pulse from its gaseous core, which reverses the normal velocity of the sheet just enough to maintain a continuous constant gas flow. With this improved model the problem can be solved more thoroughly. In particular, it was found that if the liquid velocity UJ is high enough and if the gas velocity UG〉UJ, then the bubble-formation frequency varies linearly with their difference ΔU=UG−UJ but not with their individual values.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.857408
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