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Collisions of liquid coated solid spherical particles in a viscous fluid.
O K Matar1, P D M Spelt, F Stepanek
1Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK. o.matar@imperial.ac.uk
Journal of Colloid and Interface Science
|June 13, 2006
Summary
Particle collisions in liquids depend on fluid properties and particle characteristics. Understanding these factors helps predict whether particles will rebound or stick during collisions.
Area of Science:
- Fluid dynamics
- Particle dynamics
- Surface science
Background:
- Liquid-coated particles are common in industrial processes.
- Predicting particle interaction outcomes is crucial for process optimization.
Purpose of the Study:
- To analytically describe the head-on collision of two liquid-coated spherical particles.
- To investigate the influence of various parameters on particle rebound or sticking.
Main Methods:
- Utilized lubrication theory to model the evolution of coating surfaces and fluid flow.
- Analyzed particle inertia (St), particle radius ratio (beta), surface tension (Ca), and viscosity ratio (m).
Main Results:
- Determined conditions for particle rebound versus sticking.
- Flowmaps indicate rebound likelihood increases with St and decreases with beta, Ca, and m.
- Inter-particle forces exhibit non-monotonic dependence on all parameters.
Conclusions:
- The study provides insights into the complex dynamics of liquid-coated particle collisions.
- Results can inform the design and control of processes involving particle suspensions.