TY - JOUR
T1 - Effects of interface mobility on the dynamics of colliding bubbles
AU - Vakarelski, Ivan Uriev
AU - Yang, Fan
AU - Thoroddsen, Sigurdur T
N1 - KAUST Repository Item: Exported on 2021-11-25
Acknowledged KAUST grant number(s): URF/1/3723-01-01
Acknowledgements: The work was supported by the King Abdullah University of Science and Technology (KAUST) under grant URF/1/3723-01-01.
PY - 2021/11
Y1 - 2021/11
N2 - At its core, the outcome of the collision between air bubbles is determined by the hydrodynamic interaction forces, which in turn are strongly dependent on the tangential mobility of the gas-liquid interfaces. A clean gas-liquid interface is tangentially mobile, whereas the presence of surfactant contaminants can immobilise the interface. Bubbles with mobile surfaces coalescence much easier because of the low hydrodynamic resistance to drainage of the thin liquid film separating the colliding bubbles. In this opinion we highlight recent experimental and numerical simulations demonstrating that in addition to the expected faster coalescence, mobile-surface bubbles can produce a much stronger rebound from a mobile liquid interface compared to an immobile one. The stronger rebound is explained by the lower viscous dissipation during collisions involving mobile surfaces. The role of the surface mobility in controlling the stability of gas or liquid emulsion should be reassessed in the light of these new findings.
AB - At its core, the outcome of the collision between air bubbles is determined by the hydrodynamic interaction forces, which in turn are strongly dependent on the tangential mobility of the gas-liquid interfaces. A clean gas-liquid interface is tangentially mobile, whereas the presence of surfactant contaminants can immobilise the interface. Bubbles with mobile surfaces coalescence much easier because of the low hydrodynamic resistance to drainage of the thin liquid film separating the colliding bubbles. In this opinion we highlight recent experimental and numerical simulations demonstrating that in addition to the expected faster coalescence, mobile-surface bubbles can produce a much stronger rebound from a mobile liquid interface compared to an immobile one. The stronger rebound is explained by the lower viscous dissipation during collisions involving mobile surfaces. The role of the surface mobility in controlling the stability of gas or liquid emulsion should be reassessed in the light of these new findings.
UR - http://hdl.handle.net/10754/673744
UR - https://linkinghub.elsevier.com/retrieve/pii/S1359029421001242
U2 - 10.1016/j.cocis.2021.101540
DO - 10.1016/j.cocis.2021.101540
M3 - Article
SN - 1359-0294
SP - 101540
JO - Current Opinion in Colloid & Interface Science
JF - Current Opinion in Colloid & Interface Science
ER -