硬球模型中凝聚流体冲击诱导相变的非限制振动效应

IF 1.4 4区 物理与天体物理 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY AIP Advances Pub Date : 2024-09-09 DOI:10.1063/5.0231113
Yue Zheng, Junjun Xu, Ke Tang
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引用次数: 0

摘要

流体相变的本质是硬球模型中冲击波明显诱发的物理性质跃迁。由于波的强烈冲击,分子的内部自由受到刺激,释放出巨大能量,通常会引发相变。反之,典型的热跃迁和动力跃迁可以用基于欧拉方程的朗金-胡戈尼奥特条件来描述。在理论模拟中,分子的初始密度和旋转自由度被直接视为影响相变过程的主要因素。然而,分子振动自由度的影响尚未得到讨论。由于温度的升高会逐渐激发振动自由度的情感,因此在理论中假设温度元素是恒定的是不明智的。怎样的模型才能准确反映温度与振动自由度之间的关系呢?我们勇敢地尝试了温度范围从 T0 到 6T0(T0 为无扰动温度)的非限制模型。我们发现,在相变过程中,振动自由度会对性质产生很大影响。
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Non-limited vibrational effect on shock-induced phase transitions of condensed fluid in hard-sphere model
The essence of fluid phase transition is the jump of physical properties distinctly induced by shock waves in the hard-sphere model. Due to the strong impact of the wave, the internal freedoms of molecules are stimulated, releasing tremendous energy that commonly triggers the phase transition. Conversely, typical thermal and dynamic jumps can be described by the Rankine–Hugoniot conditions based on the Euler equation. In the theoretical simulation, the initial density and rotational freedoms of molecules are directly regarded as the primary factors to affect processes of phase transition. However, the influence of vibrational freedom in molecules has not been discussed yet. As the increasing temperature can gradually excite the affection of vibrational freedom, it is unwise to assume that the temperature element is constant in the theory. What would be a suitable model that accurately reflects the relationship between temperature and affection from vibrational freedom? The non-limited model has been courageously attempted with the temperature range from T0 to 6T0 (T0 is unperturbed temperature). We have found that the vibrational freedom can have a great effect on properties during phase transition processes.
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来源期刊
AIP Advances
AIP Advances NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
2.80
自引率
6.20%
发文量
1233
审稿时长
2-4 weeks
期刊介绍: AIP Advances is an open access journal publishing in all areas of physical sciences—applied, theoretical, and experimental. All published articles are freely available to read, download, and share. The journal prides itself on the belief that all good science is important and relevant. Our inclusive scope and publication standards make it an essential outlet for scientists in the physical sciences. AIP Advances is a community-based journal, with a fast production cycle. The quick publication process and open-access model allows us to quickly distribute new scientific concepts. Our Editors, assisted by peer review, determine whether a manuscript is technically correct and original. After publication, the readership evaluates whether a manuscript is timely, relevant, or significant.
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