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Author(s):
Takashi Yabe and Yan Zhang
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Title:
Effect of Ambient Gas on Three-Dimensional Breakup in Coronet Formation Process
Date of publication:
Feb. 1998
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Key words:
Milk Crown, Simulation, Three-Dimension, Ambient Gas, Surface Capture
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Abstract:
We have succeeded for the first time to simulate the three-dimensional breakup of thin film in coronet formation process. Surprisingly, the wavelength of the irregularity along the rim of coronet sensitively depends on the density of ambient gas and linearly increases with gas density although its density is negligibly small. Therefore the Rayleigh-Taylor instability alone can not explain the phenomena ; nevertheless the deceleration may be responsible for the breakup. The simulation suggests that the breakup is due to competing between Kelvin-Helmholtz instability and Rayleigh-Taylor instability. The maximum wave number is reached when the breakup driven by R-T overcomes the swelling-up of the rim owing to K-H instability and is inversely proportional to gas density.
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