Dynamics of Shape Oscillations of a Bubble Attached to a Capillary Tip

0355154 - ÚCHP 2011 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Vobecká, Lucie - Vejražka, Jiří - Orvalho, Sandra - Zedníková, Mária - Tihon, Jaroslav
Dynamics of Shape Oscillations of a Bubble Attached to a Capillary Tip.
Proceedings Book. Liberec: Technical University of Liberec, 2010 - (Vít, T.; Dančová, P.), s. 805-813. ISBN 978-80-7372-670-6.
[Experimental Fluid Mechanics 2010. Liberec (CZ), 24.11.2010-26.11.2010]
Grant CEP: GA ČR GA104/07/1110; GA AV ČR(CZ) IAA200720801; GA AV ČR(CZ) KJB200720801
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: capillary tip * bubbles * dynamics of shape oscillations
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

The shape oscillations of a bubble, which is attached to a tip of a capillary tube, are studied experimentally. It is observed that the attachment leads to an appearance of an additional low-frequency mode (denoted as mode 1), when compared to standard theories of oscillations of free bubbles or drops. It is observed that the frequency of mode 1 scales with the bubble size as f ~ D^(-2). The oscillation dynamics of a bubble is strongly influenced if some surface active agent is present in the liquid. Due to interfacial elasticity, the surfactants presence in low concentration increases the oscillation frequency. The decay of oscillations is also faster, probably due to an increase of energy dissipation by Marangoni stresses.
Trvalý link: http://hdl.handle.net/11104/0193989