Numerical Simulation of Droplet Deposition and Self-Alignment on a Microstructured Surface

Suh, Youngho; Son, Gihun

doi:10.1080/10407781003684563

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…level-set 44,45 ) and surface evolving methods for energy minimization ("Surface Evolver" soware [46][47][48] ). Although the methodology is presented for cylindrical droplets (see also the ESI † section for axisymmetric spherical droplets), it can also be extended beyond one spatial dimension, preserving its computational merits.…”

Section: Discussionmentioning

confidence: 99%

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Enabling efficient energy barrier computations of wetting transitions on geometrically patterned surfaces

2013

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Proper roughness design is important in realizing surfaces with fully tunable wetting properties. Engineering surface roughness boils down to an energy barrier optimization problem, in which the geometric features of roughness serve as the optimization parameters. Computations of energy barriers, separating admissible equilibrium wetting states on patterned surfaces, have been demonstrated utilizing fine-scale simulators (e.g., lattice-Boltzmann for mesoscale and molecular dynamics for microscale simulations), however with substantial computational requirements. Here, by solving an augmented Young–Laplace equation with a disjoining pressure term, we demonstrate accurate and efficient computations of equilibrium shapes of entire millimeter sized droplets on patterned surfaces. In particular, by adopting a natural parameterization of the Young–Laplace equation along the liquid/air and liquid/solid interfaces, the tedious implementation of the Young's contact angle boundary condition at multiple three phase contact lines is bypassed. We, thus, enable the computation of wetting transition energy barriers, separating the well-known Cassie–Baxter and Wenzel states, as well as intermediate states, but with negligible computational cost. We demonstrate the method's efficiency by computing the equilibrium of droplets on stripe-patterned surfaces, and compare the results with mesoscopic lattice Boltzmann simulations. Our computationally efficient continuum-level analysis can be readily applied to patterned surfaces with increased and unstructured geometric complexity, and straightforwardly coupled with shape optimizers towards the design of surfaces with desirable wetting behavior.

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Section: Discussionmentioning

confidence: 99%

“…Other continuum-level methodologies include tracking interface techniques (e.g. level-set 44,45 ) and surface evolving methods for energy minimization ("Surface Evolver" soware [46][47][48] ). The proposed augmented YL equation is advantageous over these methodologies: e.g.…”

Section: Discussionmentioning

confidence: 99%

Enabling efficient energy barrier computations of wetting transitions on geometrically patterned surfaces

2013

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“…Other investigations into topographical alterations and wettabilities have been carried out with the aim of enhancing the droplet positioning. 16,17 Both utilized low contact angle substrates with walls of higher contact angle to confine the droplet; however, it is reported for the rectangular cavity case that the wettabilities alone are not sufficient to enhance droplet spreading. In this research, the popular mesoscale lattice Boltzmann method (LBM) was used.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Cavity configurations in terms of length to width ratios, Weber number, and side wall contact angles were further investigated by Liou et al They observed different morphologies for varying length to width ratios and subsequently reported how increases in We can enhance the cavity wetting. Other investigations into topographical alterations and wettabilities have been carried out with the aim of enhancing the droplet positioning. , Both utilized low contact angle substrates with walls of higher contact angle to confine the droplet; however, it is reported for the rectangular cavity case that the wettabilities alone are not sufficient to enhance droplet spreading.…”

Section: Introductionmentioning

confidence: 99%

Droplet Misalignment Limit for Inkjet Printing into Cavities on Textured Surfaces

et al. 2019

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The control of droplets deposited onto textured surfaces is of great importance for both engineering and medical applications. This research investigates the dynamics of a single droplet deposited into a confined space and its final equilibrium morphology, with emphasis given to droplet deposition under print-head misalignment, the effect of nonuniform wettability, and deposition of varying size droplets. A multi-phase pseudopotential lattice Boltzmann methodology is used to simulate the process of deposition. The print quality is characterized in terms of a parameter referred to as the wetted fraction (WF), which describes the proportion of the cavity which is wetted by the droplet. Our results show how single and multiple axis misalignment affects the final equilibrium morphology, and it was found for comparable configurations that multi-axis misalignment resulted in a higher wetted fraction. Investigations into wettabilities of the substrate and cavity wall revealed how larger ratios of the contact angles between the two enhance the ability for the droplet to self-align within the cavity. Additionally, a range of uniform wettabilities between the substrate and cavity were found which mitigate against misalignment. Investigations into varying droplet size relative to the cavity revealed how misalignment can be compensated for with larger droplets, and an upper limit is defined such that the droplet does not overflow. Finally, we explore the deposition with misalignment into closely positioned cavities where it is found that the spacing between cavities is a key factor in determining the maximum permissible misalignment.

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Inkjet droplet deposition dynamics into square microcavities for OLEDs manufacturing

Zhang

Cheng

et al. 2018

Microfluid Nanofluid

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Numerical Simulation of Droplet Deposition and Self-Alignment on a Microstructured Surface

Cited by 9 publications

References 17 publications

Enabling efficient energy barrier computations of wetting transitions on geometrically patterned surfaces

Enabling efficient energy barrier computations of wetting transitions on geometrically patterned surfaces

Droplet Misalignment Limit for Inkjet Printing into Cavities on Textured Surfaces

Inkjet droplet deposition dynamics into square microcavities for OLEDs manufacturing

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