- Title
- Film formations of aggregates due to lateral capillary forces
- Creator
- Doran, Mark; Dastoor, Paul; Sciffer, Murray; Moreno-Atanasio, Roberto
- Relation
- 5th International Conference on Particle-Based Methods. Fundamentals and Applications (PARTICLES 2017). 5th International Conference on Particle-Based Methods. Fundamentals and Applications: PARTICLES 2017 (Hannover, Germany 26-28 September, 2017) p. 332-340
- Relation
- http://congress.cimne.com/particles2017/frontal/default.asp
- Publisher
- International Center for Numerical Methods in Engineering (CIMNE)
- Resource Type
- conference paper
- Date
- 2017
- Description
- The lateral capillary force is of significant importance in liquid film coating processes [1]. This force, for particles much smaller than the capillary length, decays with the inverse of the separation distance between particles centres and is, thus, considered a longrange force [2] . In this paper, we study the role of this long-range force on the final structure of a film containing partially submerged nanoparticles. We have used computer simulations based on Discrete Element Method (DEM) to investigate film formation of mono and binary disperse particle systems. The particle radii were 80 nm, 100 nm, and 120 nm with combinations of these particle sizes for the binary disperse system. To determine the nearest neighbours for the calculation of the lateral capillary force a Delaunay Triangulation method was used. The surface coverage of the partially submerged particles was 0.05, which coincides with a parallel experimental research. The forces included in the model are the lateral and vertical capillary forces, Brownian motion, contact forces, van der Waals attraction, fluid drag and hydrodynamic resistance. The structure of the aggregates formed was compared using three parameters, the isotropic ordering factor, non-dimensional boundary length and the pair (radial) correlation function. The simulation results show that particles self-organise into isotropic aggregates due to lateral capillary forces. Particle size was shown to have little effect on final aggregate structures. Binary disperse systems were shown to have less ordered structures when compared to monodisperse systems as suggested by the decrease in peak sharpness of the pair correlation function. Increasing the particle size gap resulted in less ordering in the binary systems.
- Subject
- DEM; lateral capillary forces; self-organisation; film formation binary dispersed
- Identifier
- http://hdl.handle.net/1959.13/1385473
- Identifier
- uon:32231
- Identifier
- ISBN:9788494690976
- Language
- eng
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