Experimental study for a motion and shape of a vapor bubble rising in an annular channel at subatmospheric pressure
R.A. Dekhtyar, V.V. Ovchinnikov
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: vapor bubble, boiling, overheated liquid, annular channel
Abstract
Experimental study was performed on dynamics of vapor bubble rising in the annular channel at subatmospheric pressure. The gas bubble is formed during boiling of an overheated degassed liquid in an annular channel restricted by two glass tubes with the diameters of 25 and 16 mm. It was demonstrated that the dynamics of vapor cavity while rising the vapor bubble in the annular channel demonstrates a qualitative difference from the dynamics for an ascending gas bubble. The behavior is similar to a Taylor vapor bubble behavior in a round tube with a small diameter. One of typical features of vapor cavity behavior in an annular channel is possibility of vapor cavity decay after bubble collapse during the pulsation flow mode.
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