Abstract
An experimental study was made of the dynamics of a vapor bubble floating up in an annular channel at subatmospheric pressure. A vapor bubble was formed after boiling of an overheated degassed liquid in an annular channel formed by two tubes with diameter of 25 mm and 16 mm. The study shows that the dynamics of the vapor cavity during the ascent of vapor bubble in an annular channel has qualitative difference from the dynamics of gas bubble and has much in common with the dynamics of Taylor vapor bubble floating in a small round tube. One of the features of the behavior of the vapor cavity in the annular gap is that in the pulsation mode at the collapse stage, it can disintegrate into several parts.
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