化工学报 ›› 2018, Vol. 69 ›› Issue (S2): 402-407.DOI: 10.11949/j.issn.0438-1157.20181170

• 能源和环境工程 • 上一篇    下一篇

利用元胞自动机模拟CO2或水蒸气在液态甲烷中的凝华行为

徐笑影, 尤灏, 王文   

  1. 上海交通大学机械与动力工程学院, 上海 200240
  • 收稿日期:2018-10-09 修回日期:2018-10-21 出版日期:2018-12-31 发布日期:2018-12-31
  • 通讯作者: 王文

Numerical simulations of desublimation of CO2 or water vapor in liquid methane with cellular automata method

XU Xiaoying, YOU Hao, WANG Wen   

  1. College of Mechanical and Energy Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2018-10-09 Revised:2018-10-21 Online:2018-12-31 Published:2018-12-31

摘要:

利用热质传输方程、流体动力学方程、连续性方程和生长动力学规律分析了晶体生长的物理机制,同时利用元胞自动机法建立了凝华相变的模型,通过计算机模拟了水蒸气以及CO2在低温液态甲烷中凝华形成晶体的过程,得到了冰晶的二维模拟结果以及CO2晶体的二维和三维模拟结果。结果显示该模型能够模拟出指定温度和过饱和度下的冰晶以及CO2晶体生长过程。冰晶以及CO2晶体生长过程中具有一定的各向异性。该模型可以用于分析LNG中冰晶以及CO2晶体的形成,有利于改善LNG储存运输使用等过程中的技术流程。

Abstract:

The physical mechanism of crystal growth was analyzed using heat and mass transfer equations, Navier-Stokes equations and growth dynamics in this paper. Cellular automata (CA) method was used to form a phase change model. The desublimation process of water vapor and CO2 in liquid methane is observed by computer simulation. Not only the two-dimensional simulation results of ice crystal growth, but also the two-dimensional and three-dimensional simulation results of CO2 crystal growth in liquid methane were obtained. Results show that this model could simulate water and CO2 crystallization under sub-cooled and supersaturated environment. The two-dimensional ice crystal result is very similar to the real ice crystal with topological structure. CO2 crystal has simpler structure and the simulation results confirm to the characters of authentic CO2 crystal. This model can be improved to analyze the water and CO2 crystallization in liquid natural gas (LNG) and may be used to improve the technology processes of storage, transportation and utilization of LNG.

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