Research On The Explosive Boiling Of Ultra-Thin Liquid Film On Graphene Surface

Recently, due to the great significant importance for both science and engineering application, explosive boiling of ultra-thin liquid film has caused the extensive concern more and more. This phenomenon, however, belongs to a non-normal boiling because of very short occurrence time and extremely complex process, which is the reason why this phenomenon has seldom systematic theory and experimental study to explain it so far. Graphene, a material with two dimension, possesses remarkable thermal property. The explosive boiling phenomenon using graphene as solid surface has not been investigated so far. In this thesis, the molecular dynamics method is adopted to investigate the explosive boiling of ultra-thin argon film adjacent to graphene surface, including atomic motion trajectory, pressure and other thermo-dynamic quantities in liquid and vapor regions as a function of time.Firstly, the significance and current development of this thesis are given, including the basic concept and current development of explosive boiling, the boiling theory of classical mechanics and the discovery and remarkable properties of graphene.Secondly, the relative introduction of molecular simulation method are given, such as basic idea, potential fuction and ensemble theory. Besides that, the relative softwares involved in this thesis are also given.Finally, the systematic model for studying the explosive boiling is illustrated, along with the relative simulation process and results. Further, the effects of the temperature of heat source, the nanostructure of solid surface and the wettability between solid and liquid film on explosive boiling are discussed. By contracting and analyzing the simulation results of different heat source temperatures, it is obvious that the increase of temperature greatly rises the efficiency of explosive boiling within a certain range. In the situation of different nanostructural solid surfaces, it can be obtained that the efficiency of explosive boiling can be improved obviously if the height of nanostructure is lower or equal to the thickness of liquid film. Besides, it is visible that the bad wetting property between solid and liquid has negative effects on explosive boiling, which indicates that the bad wetting property will prevent the explosive boiling from occurring to some degree.In this thesis, the explosive boiling is investigated using molecular dynamic simulation, the result of which can provide some usefull references to the experimental study and its various practical applications.