Wall Shear Stress Induced by Taylor Bubbles in Inclined Flow Channels

0393934 - ÚCHP 2014 SK eng C - Konferenční příspěvek (zahraniční konf.)
Tihon, Jaroslav - Pěnkavová, Věra - Vejražka, Jiří
Wall Shear Stress Induced by Taylor Bubbles in Inclined Flow Channels.
Proceedings. Bratislava: Slovak Society of Chemical Engineering, 2013 - (Markoš, J.), s. 153. ISBN 978-80-89475-09-4.
[International Conference of Slovak Society of Chemical Engineering /40./. Tatranské Matliare (SK), 27.05.2013-31.05.2013]
Grant CEP: GA ČR(CZ) GAP101/12/0585
Institucionální podpora: RVO:67985858
Klíčová slova: iInclined flow channel * taylor bubbles * bubble rise velocity
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

The analysis of video records provides information on the bubble shape and terminal velocity. The experiments are carried out for three different channel configuration cover a wide range of channel inclination angles and dealing with both the bubbles in stagnant and in co-flowing water. The directionally sensitive, two-strip electrodiffusion probe is proved to be an effective tool to investigate the near-wall flow response to translating bubbles. It provides information not only on the wall shear rate distribution, but also detects the location of near-wall flow reversal, gives an estimate of the thickness of liquid film separating the large bubble from the wall, and provides also the characteristics of capillary waves appearing in the bubble tail region. The effect of channel inclination angle on the modification of wall shear stress distribution along the upper and bottom wall is also discussed.
Trvalý link: http://hdl.handle.net/11104/0222267