石墨烯基底上超薄液膜的爆炸性沸腾研究
发布时间：2019-03-31 16:54
【摘要】：超薄液膜的爆炸性沸腾由于发生时间极短,过程极其复杂,从而引起了广泛的关注和研究。石墨烯是一种新型的二维晶体材料,具有良好的热特性,以石墨烯为基底的超薄液体薄膜的爆炸性沸腾至今很少有研究。本文采用分子动力学的方法模拟了液体氩(Ar)薄膜在石墨烯表面上的爆炸性沸腾过程。首先,本文介绍了课题的研究意义和研究进展,其中包括爆炸性沸腾的基本概念和研究进展、经典力学沸腾理论、爆炸性沸腾现有的理论基础以及石墨烯的发现和这种材料优异的性质。然后,介绍了现今研究过程中常用的分子动力学这种数值方法,包括基本思想、势函数、系综理论以及模拟过程中涉及到的软件。最后,介绍了爆炸性沸腾的模型建立,利用建立的模型研究了爆炸性沸腾过程中相关量的变化。之后,探讨了热源温度、固体表面纳米结构以及固体与液体之间的润湿特性对爆炸性沸腾的影响。通过对比和分析模拟结果,可以发现在改变热源温度的情况下,在一定范围内增加热源温度可以提高爆炸性沸腾的效率;在固体基底表面增加纳米结构时,在一定范围内纳米结构高度的增加可以提高爆炸性沸腾的效率;在改变固体基底与液体之间的润湿程度时,三种不同的接触角情况下爆炸性沸腾没有发生,这种情况从某种程度上可以有效地抑制爆炸性沸腾的发生。本文采用分子动力学方法来研究固体壁面的爆炸性沸腾,对这种现象的实验研究和实际应用提供一定的参考价值。
[Abstract]:The explosive boiling of ultra-thin liquid film has attracted extensive attention and research due to its very short occurrence time and complicated process. Graphene is a new kind of two-dimensional crystal material with good thermal properties. The explosive boiling of ultra-thin liquid thin films based on graphene has been rarely studied. In this paper, the explosive boiling process of liquid argon (Ar) thin films on graphene surface is simulated by molecular dynamics method. First of all, this paper introduces the research significance and research progress of the subject, including the basic concept and research progress of explosive boiling, classical mechanics boiling theory, The present theoretical basis of explosive boiling and the discovery of graphene and the excellent properties of this material. Then, the numerical methods of molecular dynamics which are commonly used in the research are introduced, including the basic idea, the potential function, the synthesis theory and the software involved in the simulation process. Finally, the model establishment of explosive boiling is introduced, and the variation of correlation in explosive boiling process is studied by using the established model. Then, the effects of heat source temperature, surface nanostructure and wettability between solid and liquid on explosive boiling were discussed. By comparing and analyzing the simulation results, it can be found that increasing the heat source temperature in a certain range can improve the efficiency of explosive boiling when the heat source temperature is changed. The efficiency of explosive boiling can be improved by increasing the height of nanostructure in a certain range when nano-structure is added on the surface of solid substrate. When the wetting degree between solid substrate and liquid is changed, the explosive boiling does not occur under three different contact angles, which can effectively restrain the explosive boiling to some extent. In this paper, the molecular dynamics method is used to study the explosive boiling of solid wall, which provides some reference value for the experimental study and practical application of this phenomenon.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2
本文编号：2451096
[Abstract]:The explosive boiling of ultra-thin liquid film has attracted extensive attention and research due to its very short occurrence time and complicated process. Graphene is a new kind of two-dimensional crystal material with good thermal properties. The explosive boiling of ultra-thin liquid thin films based on graphene has been rarely studied. In this paper, the explosive boiling process of liquid argon (Ar) thin films on graphene surface is simulated by molecular dynamics method. First of all, this paper introduces the research significance and research progress of the subject, including the basic concept and research progress of explosive boiling, classical mechanics boiling theory, The present theoretical basis of explosive boiling and the discovery of graphene and the excellent properties of this material. Then, the numerical methods of molecular dynamics which are commonly used in the research are introduced, including the basic idea, the potential function, the synthesis theory and the software involved in the simulation process. Finally, the model establishment of explosive boiling is introduced, and the variation of correlation in explosive boiling process is studied by using the established model. Then, the effects of heat source temperature, surface nanostructure and wettability between solid and liquid on explosive boiling were discussed. By comparing and analyzing the simulation results, it can be found that increasing the heat source temperature in a certain range can improve the efficiency of explosive boiling when the heat source temperature is changed. The efficiency of explosive boiling can be improved by increasing the height of nanostructure in a certain range when nano-structure is added on the surface of solid substrate. When the wetting degree between solid substrate and liquid is changed, the explosive boiling does not occur under three different contact angles, which can effectively restrain the explosive boiling to some extent. In this paper, the molecular dynamics method is used to study the explosive boiling of solid wall, which provides some reference value for the experimental study and practical application of this phenomenon.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2
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，本文编号：2451096
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