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Bubble evolution and properties in homogeneous nucleation simulations

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Title: Bubble evolution and properties in homogeneous nucleation simulations
Authors: Angelil, Raymond Browse this author
Diemand, Juerg Browse this author
Tanaka, Kyoko K. Browse this author →KAKEN DB
Tanaka, Hidekazu Browse this author →KAKEN DB
Issue Date: 1-Dec-2014
Publisher: American Physical Society
Journal Title: Physical review E
Volume: 90
Issue: 6
Start Page: 63301
Publisher DOI: 10.1103/PhysRevE.90.063301
PMID: 25615216
Abstract: We analyze the properties of naturally formed nanobubbles in Lennard-Jones molecular dynamics simulations of liquid-to-vapor nucleation in the boiling and the cavitation regimes. The large computational volumes provide a realistic environment at unchanging average temperature and liquid pressure, which allows us to accurately measure properties of bubbles from their inception as stable, critically sized bubbles, to their continued growth into the constant speed regime. Bubble gas densities are up to 50% lower than the equilibrium vapor densities at the liquid temperature, yet quite close to the gas equilibrium density at the lower gas temperatures measured in the simulations: The latent heat of transformation results in bubble gas temperatures up to 25% below those of the surrounding bulk liquid. In the case of rapid bubble growth-typical for the cavitation regime-compression of the liquid outside the bubble leads to local temperature increases of up to 5%, likely significant enough to alter the surface tension as well as the local viscosity. The liquid-vapor bubble interface is thinner than expected from planar coexistence simulations by up to 50%. Bubbles near the critical size are extremely nonspherical, yet they quickly become spherical as they grow. The Rayleigh-Plesset description of bubble-growth gives good agreement in the cavitation regime.
Rights: ©2014 American Physical Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田中 秀和・田中 今日子

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