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Interfacial Behavior of Particle-Laden Bubbles under Asymmetric Shear Flow
Milad Eftekhari1,2, Karin Schwarzenberger1,2, Sascha Heitkam1,2
1Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, Dresden 01328, Germany.
Moving bubbles in asymmetric shear flow were studied. Nanoparticles form networks that immobilize the bubble interface, impacting fluid dynamics.
Area of Science:
- Fluid dynamics
- Interface science
Background:
- Bubble behavior is typically studied in axisymmetric flow.
- Practical conditions involve asymmetric shear forces.
Purpose of the Study:
- Investigate interfacial and hydrodynamic properties of bubbles under asymmetric shear.
- Characterize bubble response to shear flow with surfactants and nanoparticles.
Main Methods:
- Experiments with buoyant bubbles in defined shear flow.
- Profile analysis tensiometry for dynamic surface tension and rheology.
- Microscopic particle image velocimetry for bulk flow and interfacial mobility.
Main Results:
- Asymmetric shear flow induces interfacial flow, redistributing surfactants and nanoparticles.
- Nanoparticle-carbon particle (NPSC) networks form, stopping interfacial flow and reducing mobility.
- A dimensionless number characterizes interface immobilization based on elasticity and shear forces.
Conclusions:
- Interfacial nanoparticle networks can significantly alter bubble hydrodynamics.
- Findings inform boundary conditions for modeling bubble and droplet behavior.
- Quantified interfacial forces predict immobilization in defined flow fields.
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