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Effect of Surface Viscoelastic Properties on Bubble Oscillations
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SYSNO ASEP 0334140 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Effect of Surface Viscoelastic Properties on Bubble Oscillations Title Vliv viskoelastických vlastností mezifázového rozhraní na oscilace bubliny Author(s) Vejražka, Jiří (UCHP-M) RID, ORCID, SAI
Vobecká, Lucie (UCHP-M) SAI
Zedníková, Mária (UCHP-M) RID, ORCID, SAI
Orvalho, Sandra (UCHP-M) RID, ORCID, SAI
Tihon, Jaroslav (UCHP-M) RID, ORCID, SAISource Title Proceedings. - Liberec : Technical university of Liberec, 2009 / Dančová P. ; Dvořák V. - ISBN 978-80-7372-538-9 Pages 376--388 Number of pages 13 s. Action Experimental Fluid Mechanics 2009 Event date 25.11.2009-27.11.2009 VEvent location Liberec Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords bubble oscillation ; surface viscosity ; surfactants Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects IAA200720801 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40720504 - UCHP-M (2005-2011) UT WOS 000276954300044 Annotation Shape oscillations of bubbles in surfactant solutions are investigated by means of high-speed imaging. Two cases are studied: bubbles attached to a capillary tip, and bubbles freely rising after detachment. The frequency f and the decay time τ of shape oscillations are evaluated, and their dependence on the surfactant concentration and on the bubble size is investigated. If the surfactant is present, τ shortens and a minimum is found for a certain concentration. This observation demonstrates that in the surfactant solutions, the energy dissipation linked to interfacial effects can be much more important than the dissipation due to liquid viscosity. The frequency f increases with increasing concentration of the surfactant first, and then it drops rapidly at concentration, at which τ is minimal. The initial increase of the oscillation frequency suggests that the interfacial elasticity can play an important role in surfactant solutions. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2010
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