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Analysis of wake structures in bubbly flowsusing Particle Image Velocimetry (PIV)

Lewandowski Björn, Fertig Micha, Kreke Georg, Ulbricht Mathias

Chemical and Process Engineering

2019

Vol. 40, nr 1

49–-55

The flow structure around rising single air bubbles in water and their characteristics, such as equivalentdiameter, rising velocity and shape, was investigated using Particle Image Velocimetry (PIV) and Shadowgraphy in a transparent apparatus with a volume of 120mL. The effect of different volumetricgas flow rates, ranging from 4μL/min to 2 mL/min on the liquid velocity was studied. Ellipsoidalbubbles were observed with a rising velocity of 0.25–0.29 m/s. It was found that a Kármán vortex streetexisted behind the rising bubbles. Furthermore, the wake region expanded with increasing volumetricgas flow rate as well as the number and size of the vortices.