Phase segregation of liquid-vapor systems with a gravitational field
Fuente:
arXiv
Enregistré dans:
| Auteur principal: | |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866917079948460032 |
|---|---|
| author | Lamura, A. |
| author_facet | Lamura, A. |
| contents | Phase separation in the presence of external forces has attracted
considerable attention since the initial works for solid mixtures.
Despite this, only very few studies are available which address
the segregation process of liquid-vapor systems under gravity.
We present here an extensive study which takes into account both
hydrodynamic and gravitational effects on the coarsening dynamics.
An isothermal formulation of a lattice Boltzmann model for a liquid-vapor
system with the van der Waals equation of state is adopted.
In the absence of gravity, the growth of domains follows a power law
with the exponent $2/3$ of the inertial regime.
The external force deeply affects the observed morphology
accelerating the coarsening of domains and favoring the liquid accumulation
at the bottom of the system. Along the force direction,
the growth exponent is found to increase with the gravity strength
still preserving sharp interfaces since the Porod's law is found to be
verified.
The time evolution of the average thickness $L$
of the layers of accumulated material at confining walls
shows a transition from an initial regime where $L \simeq t^{2/3}$
($t$: time) to a late-time regime $L \simeq g t^{5/3}$ with $g$ the
gravitational acceleration.
The final steady state, made of two overlapped layers of liquid and
vapor, shows a density profile in agreement with theoretical predictions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_06399 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase segregation of liquid-vapor systems with a gravitational field Lamura, A. Soft Condensed Matter Computational Physics Phase separation in the presence of external forces has attracted considerable attention since the initial works for solid mixtures. Despite this, only very few studies are available which address the segregation process of liquid-vapor systems under gravity. We present here an extensive study which takes into account both hydrodynamic and gravitational effects on the coarsening dynamics. An isothermal formulation of a lattice Boltzmann model for a liquid-vapor system with the van der Waals equation of state is adopted. In the absence of gravity, the growth of domains follows a power law with the exponent $2/3$ of the inertial regime. The external force deeply affects the observed morphology accelerating the coarsening of domains and favoring the liquid accumulation at the bottom of the system. Along the force direction, the growth exponent is found to increase with the gravity strength still preserving sharp interfaces since the Porod's law is found to be verified. The time evolution of the average thickness $L$ of the layers of accumulated material at confining walls shows a transition from an initial regime where $L \simeq t^{2/3}$ ($t$: time) to a late-time regime $L \simeq g t^{5/3}$ with $g$ the gravitational acceleration. The final steady state, made of two overlapped layers of liquid and vapor, shows a density profile in agreement with theoretical predictions. |
| title | Phase segregation of liquid-vapor systems with a gravitational field |
| topic | Soft Condensed Matter Computational Physics |
| url | https://arxiv.org/abs/2510.06399 |