Investigation on the mechanisms of cluster formation and transition from adsorption to condensation
Investigation on the mechanisms of cluster formation and transition from adsorption to condensation
复制标题
团簇形成和从吸附到凝聚转变的机制研究
DOI：
10.1016/j.ijheatmasstransfer.2021.121096
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发表时间：
2021-06
影响因子：
5.2
通讯作者：
Yourong Li
中科院分区：
文献类型：
--
作者：
Chunmei Wu;Xiang Wei;Yourong Li
为了了解氩气团簇的形成机理以及从吸附到冷凝的转变过程，将基于Zeta吸附模型的一系列理论分析与分子动力学模拟相结合，研究了氩气原子在固体表面吸附的转变过程。讨论了固流相互作用强度和温度差异的影响。结果表明，界面吸附在近壁区密度分布中占主导地位。随着温差的增大，化学电位差的增大推动了吸附向冷凝的转变。确定了转变的临界温差。固流相互作用越小，冷凝阻力越大，导致临界温差越大。同时，基于Zeta吸附模型，从理论上描述了饱和压力下无奇点的团簇形成和转变过程。预测的吸附位点与分子动力学模拟结果吻合较好。一旦压力比超过一定值，吸附位置就会被均匀的团簇占据，从而引发液相润湿表面。确定润湿条件。用吉布斯方程表示，表面张力从未吸附时的固体表面张力降低到润湿时的表面张力。理论预测得到的相变临界温差与分子动力学模拟结果吻合较好。
In order to understand the mechanism of cluster formation and transition from adsorption to condensation, a series of theoretical analysis based on the Zeta adsorption model and molecular dynamics simulations are hybrid to study the transition process of argon atoms adsorption on a solid surface. The influence of solid-fluid interaction strength and temperature difference are discussed. Results show that the interfacial adsorption dominates the density profiles in the near wall region. With the increase of temperature difference, the enlarged chemical potential difference drives the transition from adsorption to condensation. The critical temperature differences for the transition are determined. The smaller value of solid-fluid interaction induces a larger condensation resistance, which results in a bigger value of critical temperature difference. Meanwhile, the cluster formation and transition process are theoretically described based on the Zeta adsorption model, without singularity at saturation pressure. The predicted adsorption sites show a good agreement with the molecular dynamics simulations. Once the pressure ratio exceeds a certain value, the adsorption sites are occupied by homogeneous clusters, which initiates the liquid phase to wet the surface. The wetting condition is determined. Also, in terms of Gibbs equation, the surface tension is lowered from the solid surface tension without adsorption to the value at wetting. The critical temperature difference for the transition obtained by theoretical prediction coincides well with the molecular dynamics simulation.
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DOI：
10.1016/s0016-0032(17)90938-x
发表时间：
--
影响因子：
4.1
作者：
I. Langmuir
通讯作者：
I. Langmuir
DOI：
10.1063/1.1881032
发表时间：
2005-03
期刊：
The Journal of chemical physics
影响因子：
--
作者：
E. Zapadinsky;A. Lauri;M. Kulmala
通讯作者：
E. Zapadinsky;A. Lauri;M. Kulmala
影响因子：
4.4
作者：
SIPS, R
通讯作者：
SIPS, R
DOI：
10.1088/0370-1328/72/5/321
发表时间：
1958-11
期刊：
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影响因子：
--
作者：
D. Stansfield
通讯作者：
D. Stansfield
DOI：
10.1021/acs.langmuir.9b03339
发表时间：
2019-12
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
J. Pu;Jie Sun;Q. Sheng;Wen Wang;Hua Sheng Wang
通讯作者：
J. Pu;Jie Sun;Q. Sheng;Wen Wang;Hua Sheng Wang