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- W5143721 abstract "A new algorithm is presented that allows for the determination of bulk liquid and vapor densities from a two-phase Molecular Dynamics (2φMD) simulation. This new method does not use any arbitrary cut-offs for phase definitions; rather it uses single-phase simulations as a self-consistency check. The method does not use any spatial bins for generating histograms of local properties, thereby avoiding the statistical issues associated with bins. Finally, it allows one to approach very close to the critical point. The new method utilizes Voronoi tessellations to determine the molecular volume of every point at every instance in a molecular dynamics simulation. Since the molecular volume is calculated throughout the simulation, statistical parameters such as the average molecular volume and average molecular variance are easy to obtain. In order to define the phases, the normalized variance of the molecular volume from 1φMD and 2φMD is used as a self-consistency check. The new method gives new insight into the nature of the near-sub-critical fluid. The critical properties from this analysis are Tc = 1.293 and ρc = 0.313. Direct simulation of the two-phase system was performed up to a temperature of 1.292. The results show excellent agreement to experimental results and Gibbs Ensemble Monte Carlo for coexisting densities. We see that well below the critical temperature, some particles are neither liquid nor vapor. These interfacial particles are primarily, but not exclusively, concentrated at the bulk interface. However, as we approach the critical point, some particles are considered both liquid and vapor. These interfacial particles are distributed through the system" @default.
- W5143721 created "2016-06-24" @default.
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- W5143721 date "2007-01-01" @default.
- W5143721 modified "2023-09-27" @default.
- W5143721 title "Methods for the Self-Consistent Determination of Thermophysical Properties from Two-Phase Molecular Dynamics Simulations" @default.
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