TY - JOUR

T1 - A study on the growth of cavitation bubble nuclei using large-scale molecular dynamics simulations

AU - Tsuda, Shin ichi

AU - Takagi, Shu

AU - Matsumoto, Yoichiro

PY - 2008/7/1

Y1 - 2008/7/1

N2 - We have investigated the growth mechanism of cavitation bubble nuclei and a power law dependence with time for the growth of the mean radius using microcanonical molecular dynamics simulations. A competing growth process was observed in the case of a one-component liquid, while frequent coalescence was observed in the case of a two-component liquid in which a dissolved noncondensable gas forms bubble nuclei. Although nearly the same growth exponent (close to frac(1, 2)) was obtained, we found that the different characteristic in the growth is reflected to a power law for the change of the total radius (α) and that for the change of the number of bubble nuclei (β), where α reflects a characteristic of the time development of the void fraction while β reflects a characteristic collapsing or coalescence speed. The difference in these two parameters is originated from the faster pressure propagation in the one-component fluid and the slower diffusion process of the noncondensable gas in the two-component fluid.

AB - We have investigated the growth mechanism of cavitation bubble nuclei and a power law dependence with time for the growth of the mean radius using microcanonical molecular dynamics simulations. A competing growth process was observed in the case of a one-component liquid, while frequent coalescence was observed in the case of a two-component liquid in which a dissolved noncondensable gas forms bubble nuclei. Although nearly the same growth exponent (close to frac(1, 2)) was obtained, we found that the different characteristic in the growth is reflected to a power law for the change of the total radius (α) and that for the change of the number of bubble nuclei (β), where α reflects a characteristic of the time development of the void fraction while β reflects a characteristic collapsing or coalescence speed. The difference in these two parameters is originated from the faster pressure propagation in the one-component fluid and the slower diffusion process of the noncondensable gas in the two-component fluid.

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U2 - 10.1016/j.fluiddyn.2008.02.002

DO - 10.1016/j.fluiddyn.2008.02.002

M3 - Article

AN - SCOPUS:46549084599

VL - 40

SP - 606

EP - 615

JO - Fluid Dynamics Research

JF - Fluid Dynamics Research

SN - 0169-5983

IS - 7-8

ER -