温度制御可能な衝撃波管による気液非平衡状態でのメタノール蒸気の凝縮係数測定(<小特集>異相界面における諸現象の物理)

概要

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A shock tube available in a state from initially normal to high temperatures is made and it is used for the measurement of the growth of a liquid film formed on the endwall surface of the tube in a shock wave reflection region. It is found that the shock tube satisfies requirements for the experiment and the liquid film grows uniformly on the wall surface at an initially high temperature. The condensation coefficient of methanol vapor is determined from the growth of liquid films at initially normal temperatures (286.3 K〜299.6 K) and higher ones (323.3 K〜324.4 K). It is clarified that the condensation coefficient is strongly dependent on both by the ratio of vapor and liquid temperatures and by the ratio of number densities of vapor and saturated vapor at the vapor/liquid interface. For the same temperature and number density ratios, the higher is the liquid temperature, the smaller becomes the condensation coefficient, and it decreases with the increase of the number density ratio.
2002-07-25