Molecular Dynamic Thin Film Evaporation and Condensation in Nano gap

.Due to the vast advancement in modern technology, the computers and electronic devices are getting more and more miniaturized. Therefore, the importance of efficient heat transfer becomes crucial. Nowadays, Implementing phase change heat transfer in flat heat pipes with thickness less than millimeter has been one of the most efficient approaches for cooling process. Thus, more profound study on phase change heat transfer from microscopic scale and nanoscale could help to improve cooling procedure. In this study, the domain is a nano gap, with two platinum walls at top and bottom and Argon fluid in between. In non-equilibrium molecular dynamic simulation, when a temperature gradient is applied through the nano gap, there exists a non-evaporating layer on the hot wall which becomes thinner as temperature gradient is increased. The higher temperature gradient indicates a higher heat transfer coefficient. Accommodation coefficient, as the ratio of the number of the atoms cross the two phase interface to those atoms reach at the interface, is investigated in different temperatures. The combination of accommodation coefficients from molecular dynamic simulation and Schrage equation provides insight to the details of intermolecular interaction when phase change occurs in nanoscale.