@ARTICLE{Lewandowski_Björn_Analysis_2019, author={Lewandowski, Björn and Fertig, Michał and Krekel, Georg and Ulbricht, Mathias}, volume={vol. 40}, number={No 1}, journal={Chemical and Process Engineering}, pages={49-55}, howpublished={online}, year={2019}, publisher={Polish Academy of Sciences Committee of Chemical and Process Engineering}, abstract={The flow structure around rising single air bubbles in water and their characteristics, such as equivalent diameter, rising velocity and shape, was investigated using Particle Image Velocimetry (PIV) and Shadowgraphy in a transparent apparatus with a volume of 120 mL. The effect of different volumetric gas flow rates, ranging from 4 μL/min to 2 mL/min on the liquid velocity was studied. Ellipsoidal bubbleswere observedwith a rising velocity of 0.25–0.29m/s. It was found that a Kármán vortex street existed behind the rising bubbles. Furthermore, the wake region expanded with increasing volumetric gas flow rate as well as the number and size of the vortices.}, type={Article}, title={Analysis of wake structures in bubbly flows using Particle Image Velocimetry (PIV)}, URL={http://journals.pan.pl/Content/109040/PDF/04_art_CPE_2019_1.pdf}, doi={10.24425/cpe.2018.124996}, keywords={bubbly flow, Particle Image Velocimetry, wake analysis, flow characteristics, high-speedimaging}, }