Abstract
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.
Highlights
A presence of surface active agents can strongly modify the dynamics of multiphase systems
We study bubble oscillations in the surfactant solution
The peaks occur at the resonance frequencies, which identify the eigen-frequencies of bubble oscillations
Summary
A presence of surface active agents (surfactants) can strongly modify the dynamics of multiphase systems. The impact of a bubble on a horizontal solid in aqueous solution of surfactants was recently studied (Malysa et al, 2005 and Fujasová-Zedníková et al, 2010). Interface deformations seem to dissipate energy much faster, if the interface is occupied by surfactants. To verify this hypothesis, we study bubble oscillations in the surfactant solution. The energy dissipation is studied more from the decay of oscillations.
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