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Semiphenomenological model for gas-liquid phase transitions
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Resumo(s)
We examine a rarefied gas with inter-molecular attraction. It is argued that the attraction force amplifies
random density fluctuations by pulling molecules from lower-density regions into high-density regions and thus
may give rise to an instability. To describe this effect, we use a kinetic equation where the attraction force is
taken into account in a way similar to how electromagnetic forces in plasma are treated in the Vlasov model.
It is demonstrated that the instability occurs when the temperature T is lower than a certain threshold value Ts
depending on the gas density. It is further shown that, even if T is only marginally lower than Ts, the instability
generates clusters with density much higher than that of the gas. These results suggest that the instability should be
interpreted as a gas-liquid phase transition, with Ts being the temperature of saturated vapor and the high-density
clusters representing liquid droplets.
Descrição
Palavras-chave
Gas-liquid phase transitions Semiphenomenological model . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
Benilov, E. S., & Benilov, M. S. (2016). Semiphenomenological model for gas-liquid phase transitions. Physical Review E, 93(3), 032148. 10.1103/PhysRevE.93.032148
Editora
American Physical Society