Experiments on Large Bubbles Rising in an Inclined Flat Channel

0341646 - ÚCHP 2011 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
Tihon, Jaroslav - Pěnkavová, Věra - Vejražka, Jiří
Experiments on Large Bubbles Rising in an Inclined Flat Channel.
Fortschritt-berichte VDI, Reihe 3, Nr. 920. Düsseldorf: VDI Verlag, 2011 - (Schindler, F.), s. 75-88. ISBN 978-3-18-392003-7. ISSN 0178-9503.
[International Berlin Workshop on Transport Phenomena with Moving Boundaries /5./. Berlin (DE), 08.10.2009-09.10.2009]
Grant CEP: GA AV ČR(CZ) IAA200720801
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: two-phase flow * large flat bubbles * wall shear stress
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

The motion of single air bubbles in an inclined flat water channel is investigated experimentally. The electrodiffusion technique of near-wall flow diagnostics is applied to measure the wall shear stress distribution under large bubbles rising along the upper channel wall. The electrodiffusion measurements are synchronized with the visual observation of bubble movement done by a high-speed camera. The analysis of video records provides information on the bubble shape and terminal velocity. The experiments are carried out for three different channel heights (1.5, 4, and 8 mm) and cover a wide range of channel inclination angles (from horizontal to vertical position). The experimental results on bubble motion characteristics obtained in stagnant and co-flowing liquid arrangements are confronted with the recent predictions and scaling provided by theoretical models.
Trvalý link: http://hdl.handle.net/11104/0184565