分子参数对简单流体界面特性代表性的影响
B Nicolás-Apolinar1, B Ibarra-Tandi1, J López-Lemus1
1Facultad de Ciencias, Universidad Autónoma del Estado de México, CP 50200 Toluca, Mexico.
The Journal of chemical physics
|August 2, 2024
概括
新的伦纳德-斯电位参数化准确地预测了简单流体的蒸汽压力和表面张力. 然而,准确地复制液体-蒸汽平衡密度仍然是一个挑战,突出了流体热力学的一个关键问题.
科学领域:
- 分子热力学分子热力学.
- 流体的界面特性 流体的界面特性
- 计算流体动力学 计算流体动力学
背景情况:
- 准确地建模流体特性对于理解分子行为至关重要.
- 现有的潜力,如伦纳德-斯和米恩 (n, 6),在同时预测各种热力学性质方面存在局限性.
- 界面特性,如表面张力和蒸汽压力,对于流体的表征至关重要.
研究的目的:
- 开发和评估伦纳德-斯12/6潜力的新参数.
- 为了比较这些新的参数化与Mie (n, 6) 潜力的性能.
- 研究复制液体-蒸汽平衡密度和简单流体的界面特性所面临的挑战.
主要方法:
- 用分子动力学模拟来生成模拟数据.
- 开发了伦纳德-斯12/6潜力的新参数.
- 通过将模拟结果与蒸汽压力,表面张力和液-蒸汽平衡密度的实验数据进行比较,评估了这些参数化的性能.
- 该研究还分析了估计界面属性的现有参数化和方法.
主要成果:
- 新的伦纳德-斯参数化成功地复制了简单流体 (Ar,Kr,Xe,Ne,CH4) 的蒸汽压力和表面张力,但在液体-蒸汽平衡密度方面遇到了困难.
- Mie ((n, 6) 潜能充分复制了共存曲线和蒸汽压力,但不是表面张力.
- 详细分析显示,在报告的文献值中,对于像这样的简单流体的界面性质存在显著的差异.
- 开发的伦纳德-斯参数化成功应用于二进制混合物 (Ar-Kr,Ar-CH4,Xe-Kr).
- 一组新型的分子相互作用,ANC2s,证明了能够通过单个参数化重现和甲的实验界面特性的能力.
结论:
- 用单一的交互潜力的参数集复制多种热力学性质仍然是分子热力学的一个重大挑战.
- 开发的伦纳德-斯参数化为特定接口属性提供了更高的准确性,但并不能完全解决预测液体-蒸汽平衡密度的挑战.
- 在ANC2s的相互作用模型显示承诺作为一个潜在的解决方案,以统一的方法准确预测不同流体的界面特性.
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