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  • Experimental study of isothermal vertical slug flow [Elektronski vir]
    Tiselj, Iztok ; Kren, Jan ; Mikuž, Blaž, fizika, 1983-
    Large gas bubbles separated by the liquid slugs are the main characteristic of the slug flow regime. We have analyzed the stagnant Taylor bubble in the vertical isothermal turbulent counter-current ... flow with high speed videos at 100 to 800 frames per second. A single Taylor bubble was captured in each experiment through dynamical balance of the bubble drag in the downward liquid flow. Bubbles of around two to six diameters length were observed in the pipe of 26 mm diameter with liquid Reynolds numbers in front of the bubble around 6000. Video frequencies at around 400 Hz were found sufficient to capture all temporal fluctuations of the bubble interface. Algorithms for two-phase interface recognition have been developed and applied on the images of the cap and the body of the Taylor bubbles. We have observed asymmetric Taylor bubbles of bullet-train shape with the thinnest liquid film on the belly of the bullet-train shape bubble. Even the long time averaging of up to 10 min did not produced axisymmetric time-averaged shape of the bubble in turbulent liquid flow. Azimuthal position of the bubble’s belly is randomly determined during the injection of the bubble into the test section. In addition, dynamics of the tiny disturbance waves with tenth of mm amplitudes has been tracked along the interface of the Taylor bubbles. Cross-correlations of time-dependent interface fluctuations were measured at different spatial positions and used to determine propagation speeds of the traveling interface waves.
    Source: Challenges and recent advancements in nuclear energy systems [Elektronski vir] : proceedings of Saudi International Conference on Nuclear Power Engineering (SCOPE) (2024, Str. 411–422)
    Type of material - conference contribution ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 202681347

    Link(s):

    https://link.springer.com/chapter/10.1007/978-3-031-64362-0_39#citeas
    DOI

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