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Dynamics of Taylor bubble interface in vertical turbulent counter-current flow by Jan Kren; Boštjan Zajec; Iztok Tiselj; Samir El Shawish; Žiga Perne; Matej Tekavčič; Blaž Mikuž is a Engineering article available to read on EtoBox.

What is Dynamics of Taylor bubble interface in vertical turbulent counter-current flow about?

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 fl

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Author

Jan Kren; Boštjan Zajec; Iztok Tiselj; Samir El Shawish; Žiga Perne; Matej Tekavčič; Blaž Mikuž

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)