||Mean-Field Kinetic Theory Based Study of Boundary Condition at Vapor-Liquid Interface [an abstract of entire text]
The target of this thesis is heat and mass transfer in vapor-liquid two-phase systems composed of vapor and its condensed phase. Not only can this transport phenomena be widely observed in the natural world, but these are also applied to engineering. Hence, this transport phenomenon in the vapor-liquid two-phase system has been investigated from various theoretical frameworks, such as fluid dynamics, thermodynamics, and phys-ical chemistry. In this thesis, we especially examine heat and mass transfer associated with a mass flux in the normal direction passing through the vapor-liquid interface. The mass flux at the vapor-liquid interface arises due to the molecular motions near the vapor-liquid interface. In general, the influence of the microscopic phenomenon is con-fined to a sufficiently small region, and it does not affect the macroscopic phenomenon. On the other hand, it is known that the mass flux in the normal direction passing through the vapor-interface affects the vapor flow beyond the region in the vicinity of the interface. Naturally, such a mass flux should be predicted based on the microscopic theory. How-ever, simplified models that ignore the microscopic phenomenon near the vapor-liquid interface are widely used as the boundary condition in the macroscopic theory, namely, fluid dynamics. The objective of this thesis is to propose a proper boundary condition at the vapor-liquid interface from the microscopic theories, namely, the mean-field kinetic theory and molecular gas dynamics. To achieve this objective, we investigate the bound-ary condition in molecular gas dynamics by utilizing the molecular simulation based on the mean-field kinetic theory. This investigation is the main content of this thesis. With the use of this boundary condition obtained by the molecular simulation, we can derive the boundary condition in fluid dynamics by the molecular gas dynamics analysis.
Hokkaido University（北海道大学）. 博士(工学)