Dynamics of Taylor bubble interface in vertical turbulent counter-current flow
ID Kren, Jan (Author), ID Zajec, Boštjan (Author), ID Tiselj, Iztok (Author), ID El Shawish, Samir (Author), ID Perne, Žiga (Author), ID Tekavčič, Matej (Author), ID Mikuž, Blaž (Author)

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Dynamics of the Taylor bubble interface in the vertical counter-current flow was analyzed with video recordings at 100 – 800 frames per second. Taylor bubbles in air-water mixture were studied on time intervals of up to several minutes in stagnant conditions, where buoyancy is dynamically balanced by the inertial bubble drag in the downward turbulent flow. Taylor bubbles of length from 4 to 10 cm were observed in a pipe of 26 mm diameter at Reynolds numbers based on liquid superficial velocity around 6000. Algorithms, developed for analysis of the interface from the video frames were dedicated to the analysis of the cap and the body of the Taylor bubble. The long time averaging of up to 10 min samples do not end up with axisymmetric time-averaged shape of the bubble, but with an asymmetric bullet-train shape, with the thinnest liquid film observed on the belly of the bullet-train shape bubble. The main result of this study is based on high relative sensitivity of our measurements, which was sufficient to track the dynamics of the tiny disturbance waves with a tenth of mm amplitudes traveling along the interface of the Taylor bubble. Cross-correlations of time-dependent interface fluctuations measured at different spatial positions allowed us to measure propagation speeds of the interface waves. When averaged over sufficiently long time intervals of around a minute, the time averaged propagation velocities are shown to be equal to the convective velocity of the interface. Moreover, waves propagating on both sides of the two-dimensional photographs show clear correlation; crest of the wave on one side of the bubble photograph corresponds to the trough of the wave on the other side.

Keywords:slug flow, Taylor bubble, interfacial waves
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Publication status:Published
Publication version:Version of Record
Number of pages:20 str.
Numbering:Vol. 165, art. 104482
PID:20.500.12556/RUL-148316-3f57de71-04f6-f6a1-26df-5fb3d0c11804 This link opens in a new window
ISSN on article:0301-9322
DOI:10.1016/j.ijmultiphaseflow.2023.104482 This link opens in a new window
COBISS.SI-ID:150153219 This link opens in a new window
Publication date in RUL:11.08.2023
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Record is a part of a journal

Title:International journal of multiphase flow
Shortened title:Int. j. multiph. flow
COBISS.SI-ID:25649408 This link opens in a new window


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.


Funder:ARRS - Slovenian Research Agency
Project number:P2-0026
Name:Reaktorska tehnika

Funder:ARRS - Slovenian Research Agency
Project number:NC-0026
Name:Eksperimentalne in numerične raziskave vertikalnih čepastih tokov

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