2014 Fiscal Year Final Research Report
Numerical study on nonequiribrium phenomena involving phase transitions
| Project/Area Number |
23740287
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Keywords | 気泡生成 / 分子動力学法 / Ostwald成長 / キャビテーション |
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| Outline of Final Research Achievements |
We have studied Ostwald ripening of bubbles by molecular dynamics simulations involving billions of particles. The scaling exponents were estimated from the bubble-size distribution function and the values of them were successfully described by the classical theory of Ostwald ripening, the Lifshitz-Slyozov-Wagner (LSW) theory. This is the first direct confirmation of LSW theory in bubble nuclei. As temperature increases, the crossover of the scaling exponent is observed. This crossover implies that the growth of bubbles changes from interface-limited to diffusion-limited. We also observed the growth rate of the bubbles (the kinetic term) directly for the first time. While the kinetic term is well described by the theory in the scaling region, it has broad distribution in early stage. This behavior shows that the inhomogeneity of the pressure in the system and the inhomogeneity is the reason why the classical theory fails to describe the early stage of the bubble nucleation.
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| Free Research Field |
計算物性物理
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