Surfactant effect on bubble deformation and breakup after interaction with vortex structure

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F24%3A00598143" target="_blank" >RIV/67985858:_____/24:00598143 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0355873" target="_blank" >https://hdl.handle.net/11104/0355873</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Surfactant effect on bubble deformation and breakup after interaction with vortex structure

Original language description

Bubble – vortex interaction is studied experimentally in order to find out the effect of surfactants on bubble deformation and possible breakup. Experiments are based on visualization of a single bubble interacting with a single vortex-ring generated in liquid. Design of the experiment enables to control both the vortex-ring energy and the bubble size. A high-speed camera is used to record the whole interaction process: the initial free rise of mother bubble, then the interaction of mother bubble with vortex-ring, bubble deformations, possible breakup and size distribution of all daughter bubbles generated by breakup. The effect of surfactant is investigated using α-terpineol as model surfactant, in two concentrations 1⸱10-3 and 3⸱10-3 mol/L. The presence of surfactant causes the suppression of the bubble deformation and more energy is required to sufficiently deform the bubble and its breakage. Therefore, the interaction process results in bubble breakup less frequently. The static surface tension is found to be insufficient to characterise the bubble surface energy, a new scaling of the bubble breakup process is proposed. The dimensionless damping time of bubble shape oscillations is used as a parameter to scale the breakup time necessary bubble to sufficiently deform and break. This damping time is a measure of energy dissipation at the bubble interface during the shape oscillations and its magnitude differs in pure liquids and in surfactant solutions.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA22-29605S" target="_blank" >GA22-29605S: Interactions of single bubble or drop with a vortex-ring</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů