Potential of lattice Boltzmann to model droplets on chemically stripe-patterned substrates

Jansen, Henri; Sotthewes, Kai; Zandvliet, Henricus J.W.; Kooij, Ernst S.

doi:10.1016/j.apsusc.2015.11.120

Cited by 20 publications

(4 citation statements)

References 41 publications

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“…The effect of the configuration of chemical patterns on the shape and contact angles of droplets was investigated by Kooij et al, a scaling behavior was observed on the prepared surfaces with stripes of alternating wettability, and the width ratio of hydrophilic and hydrophobic stripes is the only parameter determining the scaling of anisotropic droplet shapes. Meanwhile, this experimental observation was verified by Surface Evolver simulation and lattice Boltzmann modeling . On the other hand, experimental investigations, , numerical simulations, , and theoretical modeling , were performed to analyze the relationship between the geometrical features and anisotropy in wetting for physically patterned surfaces.…”

Section: Introductionmentioning

confidence: 77%

Modeling and Measurement on the Sliding Behavior of Microgrooved Surfaces

Sun

Sui

et al. 2019

Langmuir

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The sliding behavior of anisotropic surfaces is a crucial property to their applications from fundamental research to practical fields. Herein, we propose a theoretical model for analyzing the sliding behavior based on the concept of adhesion energy. Surface Evolver simulation is conducted to determine the adhesion energy per unit area. The microgrooved surfaces are fabricated and characterized to validate the proposed theory. It is found that the apparent contact angle measured along the direction parallel to the strips increases with the increase of microgroove width, while the corresponding sliding angles exhibit an opposite trend. The adhesion energy per unit area has a constant value regardless of the droplet volume. The different sliding behaviors of anisotropic surfaces along the perpendicular and parallel directions are attributed to the difference in the corresponding adhesion energies per unit area. The proposed model is expected to be used for predicting the sliding behavior of anisotropic surfaces.

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Section: Introductionmentioning

confidence: 77%

Modeling and Measurement on the Sliding Behavior of Microgrooved Surfaces

Sun

Sui

et al. 2019

Langmuir

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“…There is a paucity of investigations for the wetting effect with droplet size much larger than the chemical heterogeneity on type C substrate. These works include a series of explorations for wetting on chemically stripped patterned surfaces via LBM [86][87][88] and experimental studies for wetting on polygonal patterns. [89] For type M substrate, there are a few studies for the wetting effect with l d ∼ l p .…”

Section: Introductionmentioning

confidence: 99%

Wetting Effect on Patterned Substrates

Wang

Nestler

2023

Advanced Materials

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A droplet deposited on a solid substrate leads to the wetting phenomenon. A natural observation is the lotus effect, known for its superhydrophobicity. This special feature is engendered by the structured microstructure of the lotus leaf, namely, surface heterogeneity, as explained by the quintessential Cassie-Wenzel theory (CWT). In this work, recent designs of functional substrates are overviewed based on the CWT via manipulating the contact area between the liquid and the solid substrate as well as the intrinsic Young's contact angle. Moreover, the limitation of the CWT is discussed. When the droplet size is comparable to the surface heterogeneity, anisotropic wetting morphology often appears, which is beyond the scope of the Cassie-Wenzel work. In this case, several recent studies addressing the anisotropic wetting effect on chemically and mechanically patterned substrates are elucidated. Surface designs for anisotropic wetting morphologies are summarized with respect to the shape and the arrangement of the surface heterogeneity, the droplet volume, the deposition position of the droplet, as well as the mean curvature of the surface heterogeneity. A thermodynamic interpretation for the wetting effect and the corresponding open questions are presented at the end.

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“…Over the last three decades, multiphase lattice Boltzmann (LB) models have developed rapidly and have been employed extensively in the field of computational fluid dynamics. [1][2][3][4][5][6][7][8] As a result of LB models not needing to explicitly track interfaces, these models are ideally suited to study physical phenomena in the multiphase flow systems, e.g., bubbles moving in the liquid phase, [9,10] wetting phenomena at the fluidsolid interfaces, [11][12][13][14][15] droplet-wall collisions, [16] and droplet splashing. [17] Among the current multiphase LB models, the pseudopotential LB scheme has attracted a lot of attention due to its computational efficiency and simplicity in coding.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, when the interaction potentials are appropriately chosen, different fluid phases can be separated automatically. [8][9][10][11][12][13][14][15][16][17][18][19][20][21] The original multiphase pseudopotential LB model proposed by Shan and Chen [18] is, however, essentially limited to a small density ratio between the two fluid phases, owing to the increased spurious current at the curved interface between different phases. [1][2][3] As a result, the model becomes inappropriate for some real-world multiphase fluid flows with large density ratios, such as the water-vapor system.…”

Section: Introductionmentioning

confidence: 99%

A multicomponent multiphase lattice Boltzmann model with large liquid–gas density ratios for simulations of wetting phenomena

2017

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A multicomponent multiphase (MCMP) pseudopotential lattice Boltzmann (LB) model with large liquid-gas density ratios is proposed for simulating the wetting phenomena. In the proposed model, two layers of neighboring nodes are adopted to calculate the fluid-fluid cohesion force with higher isotropy order. In addition, the different-time-step method is employed to calculate the processes of particle propagation and collision for the two fluid components with a large pseudoparticle mass contrast. It is found that the spurious current is remarkably reduced by employing the higher isotropy order calculation of the fluid-fluid cohesion force. The maximum spurious current appearing at the phase interfaces is evidently influenced by the magnitudes of fluid-fluid and fluid-solid interaction strengths, but weakly affected by the time step ratio. The density ratio analyses show that the liquid-gas density ratio is dependent on both the fluid-fluid interaction strength and the time step ratio. For the liquid-gas flow simulations without solid phase, the maximum liquid-gas density ratio achieved by the present model is higher than 1000:1. However, the obtainable maximum liquid-gas density ratio in the solid-liquidgas system is lower. Wetting phenomena of droplets contacting smooth/rough solid surfaces and the dynamic process of liquid movement in a capillary tube are simulated to validate the proposed model in different solid-liquid-gas coexisting systems. It is shown that the simulated intrinsic contact angles of droplets on smooth surfaces are in good agreement with those predicted by the constructed LB formula that is related to Young's equation. The apparent contact angles of droplets on rough surfaces compare reasonably well with the predictions of Cassie's law. For the simulation of liquid movement in a capillary tube, the linear relation between the liquid-gas interface position and simulation time is observed, which is identical to the analytical prediction. The simulation results regarding the wetting phenomena of droplets on smooth/rough surfaces and the dynamic process of liquid movement in the capillary tube demonstrate the quantitative capability of the proposed model.

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Potential of lattice Boltzmann to model droplets on chemically stripe-patterned substrates

Cited by 20 publications

References 41 publications

Modeling and Measurement on the Sliding Behavior of Microgrooved Surfaces

Modeling and Measurement on the Sliding Behavior of Microgrooved Surfaces

Wetting Effect on Patterned Substrates

A multicomponent multiphase lattice Boltzmann model with large liquid–gas density ratios for simulations of wetting phenomena

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