A shock tube available at the state of initially high temperature is made and it is used for the measurement of the growth rate of a liquid film formed on the endwall surface at high temperature. The condensation coefficient of methanol vapor is determined from the growth rate of the liquid film.

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A mechanism behind the force pushing bubbles towards the tube center in vertical bubbly flow was proposed in this study, which related to a transition of sliding-core bubbly flows. Preliminary tests with a vertical tube, stagnant water and constant bubble generation, confirmed that the bubble concentrated at the center of tube at some axial distance from the bubble inlet while after the start of the wall-side-bubble generation or as the bubble-passing-number increased, and that the bubble concentration was generated by self-induced bubble motion caused by three-dimensional wake.

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