Herein, a simulation model is proposed that combines the lattice Boltzmann method (LBM) and a magnetic particle model to observe particle ring patterns in evaporating sessile droplets, controlling them using a magnetic field. Brownian dynamics and van der Waals force models are applied to the nanoparticles. The interactions between the magnetic particles are simulated using the magnetic particle model, which is validated using previous experimental particle distribution results. The particle deposition patterns are compared according to the substrate wetting conditions. The distribution exhibited a clear coffee-ring pattern as the pinning time of the contact line increased. In the case of a non-pinned droplet, the thermal Marangoni flow was maintained, and the adhesion of the particles was delayed by the vortex. A thick, uniform ring pattern was formed when a magnetic field was applied to the particles. The particle bundles formed by the magnetic field were resistant to flow. To verify this result, the average particle velocity was measured. Consequently, particle transfer was classified into three stages. In Stage I, capillary force dominates, Marangoni flow develops in Stage II, and particle adhesion occurs in Stage III. With an increase in the magnetic strength, the velocity change exhibited a decrease across all stages.
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December 2023
Research Article|
December 12 2023
Particle deposition dynamics in evaporating droplets using lattice Boltzmann and magnetic particle simulation
Hee Min Lee
;
Hee Min Lee
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
Division of Inkjet Printing Solutions, Department of Mechanical Engineering, Yonsei University
, Seoul 03722, South Korea
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Joon Sang Lee
Joon Sang Lee
a)
(Conceptualization, Formal analysis, Funding acquisition, Project administration, Resources, Supervision, Writing – original draft)
Division of Inkjet Printing Solutions, Department of Mechanical Engineering, Yonsei University
, Seoul 03722, South Korea
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 35, 123325 (2023)
Article history
Received:
September 01 2023
Accepted:
November 19 2023
Citation
Hee Min Lee, Joon Sang Lee; Particle deposition dynamics in evaporating droplets using lattice Boltzmann and magnetic particle simulation. Physics of Fluids 1 December 2023; 35 (12): 123325. https://doi.org/10.1063/5.0174636
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