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arXiv 0901.3656cond-mat.soft
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狭缝孔中流体桥蒸发过程的分子动力学模拟

Molecular Dynamics simulation of evaporation processes of fluid bridges confined in slit-like pore

Katarzyna Bucior, Leonid Yelash, Kurt Binder

摘要:

一个简单的流体,通过Lennard-Jones势相互作用的点状粒子所描述的,被认为是下限制在两个壁之间的狭缝几何形状在距离Lz的汽液共存曲线内的密度。平衡则需要两壁之间的液体“桥”和剩余孔隙体积中的蒸汽共存。我们研究这种平衡的几个选择的壁-流体相互作用(对应于整个范围从完全润湿到完全干燥,宏观厚膜),并考虑在这样的系统中的状态变化的动力学。特别是,我们研究如何建立这种平衡的扩散过程中,当液体被插入到一个最初空的毛细管(部分或完全蒸发到真空),或当可用的气相体积增加。我们比较了描述这些过程的速率在这样的非均匀系统中的扩散常数在相应的散装液体和蒸汽相的扩散常数。

英文摘要:

A simple fluid, described by point-like particles interacting via the Lennard-Jones potential, is considered under confinement in a slit geometry between two walls at distance Lz apart for densities inside the vapor-liquid coexistence curve. Equilibrium then requires the coexistence of a liquid "bridge" between the two walls, and vapor in the remaining pore volume. We study this equilibrium for several choices of the wall-fluid interaction (corresponding to the full range from complete wetting to complete drying, for a macroscopically thick film), and consider also the kinetics of state changes in such a system. In particular, we study how this equilibrium is established by diffusion processes, when a liquid is inserted into an initially empty capillary (partial or complete evaporation into vacuum), or when the volume available for the vapor phase increases. We compare the diffusion constants describing the rates of these processes in such inhomogeneous systems to the diffusion constants in the corresponding bulk liquid and vapor phases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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