Growth regimes in three-dimensional phase separation of liquid-vapor systems
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866916104932163584 |
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| author | Negro, Giuseppe Gonnella, Giuseppe Lamura, Antonio Busuioc, Sergiu Sofonea, Victor |
| author_facet | Negro, Giuseppe Gonnella, Giuseppe Lamura, Antonio Busuioc, Sergiu Sofonea, Victor |
| contents | The liquid-vapor phase separation is investigated via lattice Boltzmann simulations in three dimensions. After expressing length and time scales in reduced physical units, we combined data from several large simulations (on $512^3$ nodes), with different values of viscosity, surface tension and temperature, to obtain a single curve of rescaled length $\hat{l}$ as a function of rescaled time $\hat{t}$. We find evidence of the existence of kinetic and inertial regimes with growth exponents $α_d=1/2$ and $α_i=2/3$ over several time decades, with a crossover from $α_d$ to $α_i$ at $\hat{t} \simeq 1$. This allows us to rule out the existence of a viscous regime with $α_v=1$ in three-dimensional liquid-vapor isothermal phase separation, differently from what happens in binary fluid mixtures. An in-depth analysis of the kinetics of the phase separation process, as well as a characterization of the morphology and the flow properties, are further presented in order to provide clues into the dynamics of the phase-separation process. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_03382 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Growth regimes in three-dimensional phase separation of liquid-vapor systems Negro, Giuseppe Gonnella, Giuseppe Lamura, Antonio Busuioc, Sergiu Sofonea, Victor Soft Condensed Matter Fluid Dynamics The liquid-vapor phase separation is investigated via lattice Boltzmann simulations in three dimensions. After expressing length and time scales in reduced physical units, we combined data from several large simulations (on $512^3$ nodes), with different values of viscosity, surface tension and temperature, to obtain a single curve of rescaled length $\hat{l}$ as a function of rescaled time $\hat{t}$. We find evidence of the existence of kinetic and inertial regimes with growth exponents $α_d=1/2$ and $α_i=2/3$ over several time decades, with a crossover from $α_d$ to $α_i$ at $\hat{t} \simeq 1$. This allows us to rule out the existence of a viscous regime with $α_v=1$ in three-dimensional liquid-vapor isothermal phase separation, differently from what happens in binary fluid mixtures. An in-depth analysis of the kinetics of the phase separation process, as well as a characterization of the morphology and the flow properties, are further presented in order to provide clues into the dynamics of the phase-separation process. |
| title | Growth regimes in three-dimensional phase separation of liquid-vapor systems |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2302.03382 |