Motion of Vapor–Liquid Interfaces

Abstract

There are many researches that concentrated on the evaporation and dynamics of liquid—vapour interface during boiling. Among them as experimental results and as theoretical model with numerical simulation are presented. For example the transient film boiling in the vicinity of a stagnation point on the frontal surface of a very hot blunt body which moves with a constant velocity in an incompressible viscous fluid in the presence of a vapour layer near the body surface is studied in [1]. Within the unsteady two-phase boundary layer approximation, the equations of motion of the liquid and vapour phases are formulated with taking into account the conservation of mass, momentum, and energy on the a priori unknown phase interface. In the vicinity of the stagnation point on the body surface, the solution of the boundary layer equations is sought. At this a parabolic system of partial differential equations is obtained, which is solved numerically. The similarity parameters controlling the film boiling process are determined. On the basis of parametric numerical calculations, the dynamics of the vapour layer are investigated for the case of a plane hot body moving in water with the room pressure and temperature. In the space of governing parameters, the limits of the existence of steady and unsteady film boiling regimes are found.