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Dynamic wetting of an occlusion after droplet impact
- Source :
- International Journal of Multiphase Flow. 111:264-271
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- This paper investigates how and under which conditions the lamella of an impacting droplet is punctured by the presence of a small occlusion. Better understanding the conditions which lead to the rupture of the lamella is critical to produce defect free coating layers in the context of spray coating, for example. An analytical model based on surface energy analysis is proposed to obtain the critical thickness below which the liquid layer above the occlusion is unstable and lamella rupture occurs. Furthermore, we have developed a three dimensional multiphase lattice Boltzmann code to confirm the surface energy analysis and study the influence of key parameters like size of the occlusion, impact velocity and wettability of substrate on hole formation. Results show that a hole is more likely to appear as the diameter of the occlusion, the impact velocity, and the hydrophobicity of the surface increase.
- Subjects :
- Fluid Flow and Transfer Processes
Materials science
Mechanical Engineering
Lattice Boltzmann methods
General Physics and Astronomy
Context (language use)
02 engineering and technology
Surface finish
Substrate (electronics)
engineering.material
01 natural sciences
Surface energy
010305 fluids & plasmas
Condensed Matter::Soft Condensed Matter
Physics::Fluid Dynamics
020303 mechanical engineering & transports
Lamella (surface anatomy)
0203 mechanical engineering
Coating
0103 physical sciences
engineering
Wetting
Composite material
Subjects
Details
- ISSN :
- 03019322
- Volume :
- 111
- Database :
- OpenAIRE
- Journal :
- International Journal of Multiphase Flow
- Accession number :
- edsair.doi...........5ebb879650d1de740e07c0e77c5ba67d