Pages 55-56
The paper is concerned with the nonequilibrium condensation from a vapor to a liquid phase on the plane endwall of a shock tube behind a reflected shock wave. The growth of a liquid film on the endwall is measured by an optical interferometer using a laser beam. The experiment is carefully conducted on the precisely designed apparatus, and thereby the condensation coefficient of methanol vapor is determined in a wide range of vapor-liquid conditions from near to far from equilibrium states. The result shows that the condensation coefficient increases with the increase of the ratio of vapor and liquid temperatures, and it decreases with the increase of the ration of number densities of vapor and saturated vapor at the interface. Near vapor-liquid equilibrium conditions, the measured condensation coefficient agrees well with the one by molecular dynamics simulation.
