S0507-1-2 衝撃波管実験とボルツマン方程式解析による平衡状態近傍での水蒸気およびメタノール蒸気の凝縮係数決定([S0507-1]気泡力学と界面現象(1))

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The condensation coefficients of water and methanol, i.e., the ratios of condensation mass flux of vapor molecules to their mass flux colliding on the interface, are evaluated by combining the experiment conducted by a shock tube and the numerical simulation of Gaussian-BGK Boltzmann equation applicable to polyatomic gases. Film condensation occurs on the endwall of vapor filled shock-tube, when a shock wave is reflected at the endwall and the vapor eventually becomes supersaturated there. The formed liquid film grows with the lapse of time. The time evolution in thickness of the liquid film is measured by an optical interferometer, and thereby the growth rate of the film is obtained. The rate is incorporated into the kinetic boundary condition at the interface for the Gaussian-BGK Boltzmann equation, the solution of which is in consequence obtained uniquely. The condensation coefficients in nearequilibrium states for water and methanol are found to be close to those evaluated by molecular dynamics simulations at equilibrium states.
2010-09-04