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Homogeneous Vapor Nucleation Using Isothermal Multibody Dissipative Particle Dynamics

Homogeneous nucleation of a vapor bubble from a bulk metastable phase is studied here for the first time using the multibody dissipative particle dynamics model. The van der Waals equation of state is used to define a conservative force that describes the model fluid used in this study. Additional computational tools were developed to help visualize the vapor bubble formed in the system. Continuum thermodynamic ideas are used to help identify the bubble interface and separate particles that constitute the vapor bubble and bulk liquid regions respectively. Using this idea, the density variation is found to vary smoothly from the liquid to vapor regions in the system. The square-gradient term that arises from the free energy expansion of the density is found to have no significant effect on the radial local density variation.