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

0390269 - ÚCHP 2013 RIV FR eng J - Journal Article
Vobecká, Lucie - Vejražka, Jiří - Orvalho, Sandra - Zedníková, Mária - Tihon, Jaroslav
Dynamics of Shape Oscillations of a Bubble Attached to a Capillary Tip.
EPJ Web of Conferences. - (Wang, A.). Roč. 25, 16 April (2012), s. 02029. ISSN 2100-014X.
[Experimental Fluid Mechanics 2011. Jičín, 22.11.2011-26.11.2011]
R&D Projects: GA ČR GA104/07/1110; GA AV ČR(CZ) IAA200720801; GA AV ČR(CZ) KJB200720801
Institutional research plan: CEZ:AV0Z40720504
Keywords : bubble oscillations * surface active agents * damping
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

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 (e.g., Miller & Scriven, 1968). 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.
Permanent Link: http://hdl.handle.net/11104/0219171