Probing Into the Drying Pattern Dynamics of a Ferrofluid Droplet Under the Actuation of Magnetic Field

Nair, Nishant; Shyam, Sudip; Mondal, Pranab Kumar; Bhatnagar, S. P.

doi:10.1109/tmag.2022.3179587

Cited by 4 publications

(1 citation statement)

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“…The existing work is devoted to the evaporation of sessile droplets with ferrofluid synthesized by the coprecipitation method and the addition of surfactants [36][37][38][39]. A series of studies have been carried out and focused on evaporation kinetics [40,41], deposition mode [42,43], magnetic field effect [38,39], and pinning and depinning mechanisms [37]. The concentration of ferrofluid would affect the proportion of different stages and be positively correlated with the width and height of the coffee ring.…”

Section: Introductionmentioning

confidence: 99%

Magnetic regulation on evaporation behavior of ferrofluid sessile droplets

Wang

Zhu

2023

Electrophoresis

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Active magnetic regulation is an emerging subject due to the special and programmable wettability of the sessile ferrofluid droplet. The interaction between liquid and externally applied magnetic field gives rise to controllable spreading and thus evaporation. This work reports the experimental and numerical results of the natural evaporation of a ferrofluid droplet under the effect of a nonuniform magnetic field. The evaporation process of droplets is described into two stages in terms of the geometric distortion and the appearance of the deposition pattern. The presence of the magnetic field leads to a transition of droplet drying from the disk shape with a ring to multiple peaks. A numerical model is established to simulate the evaporation process of ferrofluid droplets with the arbitrary Lagrangian–Eulerian method for tracking droplet deformation. The increasing magnetic flux could effectively enlarge the contact radius and enhance the internal flow of the ferrofluid droplet, thus promoting the evaporation process. The numerical results are verified by comparing the droplet geometry deformation with the experimental results. In both the numerical and experimental investigations, the externally applied magnetic field shortens the process of ferrofluid droplet evaporation. The design and optimization of the magnetic field play an important role in regulating ferrofluid droplet evaporation, which in turn facilitates technological advances in industries such as evaporative cooling and inkjet printing.

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