Collision of Bubbles with Solid Surface in the Presence of Specific Surfactants.

0542379 - ÚCHP 2022 RIV CH eng J - Článek v odborném periodiku
Zedníková, Mária - Crha, Jakub - Vobecká, Lucie - Basařová, P. - Vejražka, Jiří - Tihon, Jaroslav
Collision of Bubbles with Solid Surface in the Presence of Specific Surfactants.
Minerals. Roč. 11, č. 5 (2021), č. článku 442. E-ISSN 2075-163X
Grant CEP: GA ČR(CZ) GA19-09518S
Institucionální podpora: RVO:67985858
Klíčová slova: bubble–surface collision * surfactants * bubble oscillations * gas–liquid–solid system
Obor OECD: Chemical engineering (plants, products)
Impakt faktor: 2.818, rok: 2021
Způsob publikování: Open access
https://www.mdpi.com/2075-163X/11/5/442

The present work is motivated by the effort to understand basic processes occurring in three-phase systems where small bubbles interact with large particles. The simplified system of a single bubble rising in a stagnant liquid and colliding with a solid surface is studied. The effect of two specific surfactants, α-Terpineol and n-Octanol, is investigated. Two independent measurements are combined: bubble–solid surface collision experiments and the bubble shape oscillations induced by a movable capillary. It was observed that even for small concentrations of a surfactant, both the bubble shape oscillations and the bubble bouncing on the solid surface are significantly suppressed. Two predictions for the restitution coefficient are proposed. The equations include a term characterizing the suppression of the damping time in the presence of surfactants and a term balancing the inertia, capillary and viscous forces in the liquid film separating the bubble and the solid surface.
Trvalý link: http://hdl.handle.net/11104/0319829