会合性液体の蒸発・凝縮現象に関する分子論的研究 （衝撃波管による実験と分子動力学シミュレーション）

This paper is concerned with shock-tube experiments of the phase transition from vapor to liquid and its molecular dynamics computer simulation. The growth of a liquid film formed on the endwall surface of a shock tube in a shock wave reflection region is measured by an optical interferometer using laser beams with two different wavelengths. The condensation coefficient of methanol vapor is obtained from the conformity between the experiment on the liquid film growth and the gasdynamics theory with kinetic boundary conditions. The condensation coefficient of methanol vapor is found to be between 0.15 and 0.18. This value is in good agreement with a theoretical condensation coefficient (0.1∼0.3) which is obtained on the basis of molecular dynamics computer simulation. The simulation suggests that vapor molecules colliding with the liquid surface apparently drive other molecules out of liquid ; i.e., the fluxes of condensation and evaporation have a strong correlation.