Lattice Boltzmann simulation of the movement of droplets on stripe-patterned surfaces having different wettability

Lee, Chang-Woo; Lyu, Sungnam; Park, Jae Wan; Hwang, Woonbong

doi:10.1016/j.advengsoft.2015.10.001

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…In the literature, there have been some LB studies about droplet dynamics on chemically patterned surfaces under the isothermal (constant-temperature) condition [32][33][34][35][36][37][38]. We also notice that Ledesma-Aguilar et al [39] have conducted an LB study of droplet evaporation using a phase-field multiphase LB model.…”

Section: Introductionmentioning

confidence: 93%

“…In the literature, there have been some LB studies about droplet dynamics on chemically patterned surfaces under the isothermal (constant-temperature) condition. − We also notice that Ledesma-Aguilar et al conducted an LB study of droplet evaporation using a phase-field multiphase LB model. In their work the LB simulations were carried out under the isothermal condition and the evaporation was driven by concentration gradients.…”

Section: Introductionmentioning

confidence: 99%

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Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study

2016

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In this paper, the pinning and depinning mechanism of the contact line during droplet evaporation on chemically stripe-patterned surfaces is numerically investigated using a thermal multiphase lattice Boltzmann (LB) model with liquid-vapor phase change. A local force balance in the context of diffuse interfaces is introduced to explain the equilibrium states of droplets on chemically patterned surfaces. It is shown that when the contact line is pinned on a hydrophobic-hydrophilic boundary, different contact angles can be interpreted as the variation of the length of the contact line occupied by each component. The stick-slip-jump behavior of evaporating droplets on chemically patterned surfaces is well captured by the LB simulations. Particularly, a slow movement of the contact line is clearly observed during the stick (pinning) mode, which shows that the pinning of the contact line during droplet evaporation on chemically stripe-patterned surfaces is actually a dynamic pinning process and the dynamic equilibrium is achieved by the self-adjustment of the contact lines occupied by each component. Moreover, it is shown that when the surface tension varies with the temperature, the Marangoni effect has an important influence on the depinning of the contact line, which occurs when the horizontal component (toward the center of the droplet) of the force caused by the Marangoni stress overcomes the unbalanced Young's force toward the outside.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study

2016

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“…In recent years, tremendous research efforts have been made in investigating the pinning-depinning mechanism [13][14][15][16][17][18] on patterned surfaces, such as structurally rough surfaces [19][20][21][22][23] and chemically heterogeneous surfaces [24][25][26][27][28][29]. The pinning and depinning forces [20,30] and the intrinsic energy barrier [23,31]were used to explain the pinning-depinning mechanism.…”

Section: Introductionmentioning

confidence: 99%

3D Lattice Boltzmann Simulation of Droplet Evaporation on Patterned Surfaces: Study of Pinning-Depinning Mechanism

Dong

Wang

Zhang

et al. 2019

Preprint

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The liquid-vapor phase change lattice Boltzmann method is used to investigate the pinning-depinning mechanism of the contact line during droplet evaporation on the stripe-patterned surfaces in 3D space. Considering the curvature of the contact line and the direction of the unbalanced Young’s force, the local force balance theory near the stripe boundary is proposed to explain the steady state of the droplets on the stripe-patterned surfaces. An equation is proposed to evaluate the characteristic contact angle of the stabilized droplets. During the evaporation of the droplet, the stick-slip-jump behavior and the CCR-Mixed-CCA mode can be well captured by the lattice Boltzmann simulation. When the contact line is pinned to the stripe boundary, the contact line in the direction perpendicular to the stripes is slowly moving while the curvature of the contact line is gradually increasing. The gradually increasing curvature of the contact line accelerates the movement of the contact line, and the final contact line is detached from the stripe boundary. The research results provide theoretical support and guidance for the design, improvement and application of patterned surfaces in the field of micro-fluidic and evaporation heat transfer.

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“…Boltzmann model was developed to study the contact angles of droplets on the surfaces with regular roughness structures [14]. Lee et al [15] has recently developed a lattice Boltzmann model to investigate the movement of droplet on stripe-patterned surfaces. Jung et al [16] also employed the lattice Boltzmann method to determine the optimal geometry of microstructures to achieve superhydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann parallel simulation of microflow dynamics over structured surfaces

Zhou

Yan

Liu

et al. 2017

Advances in Engineering Software

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In the present work, a parallel lattice Boltzmann multiphase model was developed to investigate the effects of surface structures on wettabilities and flow dynamics in a microchannel. The theory of wetting transition was firstly discussed. Then three types including triangular, rectangle and hierarchical shaped microstructures were constructed on the surface to examine the effects on wettabilities and drag reduction. It was found that flow behaviour is strongly affected by the surface morphology of the channel. The results indicated that hierarchical structures on the surface could improve the hydrophobicity significantly. For rectangular structures, they can improve the hydrophobicity with the increase of height and distance ratio h/d of the structures, and the improvement will reach its optimal hydrophobicity when the value h/d is over a certain value of 0.6. Moreover, to accelerate computational speed, the Open Multi-Processing (OpenMP) was employed for the parallelization of the model. A maximum speedup of 2.95 times was obtained for 4 threads on a multi-core CPU platform.

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Lattice Boltzmann simulation of the movement of droplets on stripe-patterned surfaces having different wettability

Cited by 11 publications

References 29 publications

Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study

Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study

3D Lattice Boltzmann Simulation of Droplet Evaporation on Patterned Surfaces: Study of Pinning-Depinning Mechanism

Lattice Boltzmann parallel simulation of microflow dynamics over structured surfaces

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