Shape Oscillations of Attached Bubbles in Pure Liquids and in Surfactant Solutions

0372253 - ÚCHP 2012 US eng C - Konferenční příspěvek (zahraniční konf.)
Vejražka, Jiří - Vobecká, Lucie - Meunier, N. - Zedníková, Mária - Orvalho, Sandra - Tihon, Jaroslav
Shape Oscillations of Attached Bubbles in Pure Liquids and in Surfactant Solutions.
Bulletin of the American Physical Society 56 (18). New York: American Physical Society, 2011, G3.00009.
[Meeting of the APS Division of Fluid Dynamics /64./. Baltimore (US), 20.11.2011-22.11.2011]
Grant CEP: GA ČR GAP101/11/0806
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: surfactants * bubble oscillation * interfacial rheology
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
http://meeting.aps.org/Meeting/DFD11/Content/2194

For larger bubbles, the effect of neck formation on the oscillations is documented experimentally. The addition of a surfactant to the system modifies both the oscillation frequency and damping. The frequency initially increases with the increasing surfactant concentration due to Gibbs elasticity, and starts to decrease only after exceeding some surfactant concentration. The damping strongly increases, passes through a maximum and then slightly decreases. The maximum damping is observed for the concentration, at which the oscillation frequency starts to decrease. Concluding, bubble oscillations are strongly sensitive to presence of a surfactant.
Trvalý link: http://hdl.handle.net/11104/0205612