A lattice Boltzmann model for substrates with regularly structured surface roughness

Yagub, A.; Farhat, H.; Kondaraju, Sasidhar; Singh, Trilochan

doi:10.1016/j.jcp.2015.08.040

Cited by 19 publications

(8 citation statements)

References 42 publications

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“…According to the wetting theory, the wetting mode is mainly determined by wetting pressure ( P W ) and antiwetting pressure ( P C ) , where σ is surface tension of liquid, θ A is the advancing contact angle of the flat surface, L C is capillary perimeter, and A C is capillary area. It is clear that both the selection of materials and the specific geometry of surface roughness have a significant influence on antiwetting pressure.…”

Section: Resultsmentioning

confidence: 77%

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Dual-Functional Superhydrophobic Textiles with Asymmetric Roll-Down/Pinned States for Water Droplet Transportation and Oil–Water Separation

Su¹,

Li²,

Lai³

et al. 2018

ACS Appl. Mater. Interfaces

110

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Superhydrophobic surfaces with tunable adhesion from lotus-leaf to rose-petal states have generated much attention for their potential applications in self-cleaning, anti-icing, oil-water separation, microdroplet transportation, and microfluidic devices. Herein we report a facile magnetic-field-manipulation strategy to fabricate dual-functional superhydrophobic textiles with asymmetric roll-down/pinned states on the two surfaces of the textile simultaneously. Upon exposure to a static magnetic field, fluoroalkylsilane-modified iron oxide (F-FeO) nanoparticles in polydimethylsiloxane (PDMS) moved along the magnetic field to construct discrepant hierarchical structures and roughnesses on the two sides of the textile. The positive surface (closer to the magnet, or P-surface) showed a water contact angle up to 165°, and the opposite surface (or O-surface) had a water contact angle of 152.5°. The P-surface where water droplets easily slid off with a sliding angle of 7.5° appeared in the "roll-down" state as Cassie mode, while the O-surface was in the "pinned" state as Wenzel mode, where water droplets firmly adhered even at vertical (90°) and inverted (180°) angles. The surface morphology and wetting mode were adjustable by varying the ratios of F-FeO nanoparticles and PDMS. By taking advantage of the asymmetric adhesion behaviors, the as-fabricated superhydrophobic textile was successfully applied in no-loss microdroplet transportation and oil-water separation. Our method is simple and cost-effective. The fabricated textile has the characteristics of superhydrophobicity, magnetic responsiveness, excellent chemical stability, adjustable surface morphology, and controllable adhesion. Our findings conceivably stand out as a new tool to fabricate functional superhydrophobic materials with asymmetric surface properties for various potential applications.

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Section: Resultsmentioning

confidence: 77%

“…According to the wetting theory, the wetting mode is mainly determined by wetting pressure (P W ) and antiwetting pressure (P C ). 37 P C is closely related to the capillary pressure and can be calculated according to the following equation: 38,39…”

Section: ■ Introductionmentioning

confidence: 99%

Dual-Functional Superhydrophobic Textiles with Asymmetric Roll-Down/Pinned States for Water Droplet Transportation and Oil–Water Separation

Su¹,

Li²,

Lai³

et al. 2018

ACS Appl. Mater. Interfaces

110

View full text Add to dashboard Cite

show abstract

“…There is a threhold Young's angle C which will be discussed in detail in the next section. Previous research also indicated that wetting transition between Wenzel and Different Cassie-Baxter state can be predited by using lattice Boltzmann method [14]. Contact angles with different states are illustrated in…”

Section: Wetting Transitionmentioning

confidence: 96%

“…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.…”

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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“…al. [24] used Shan and Chen (SC) lattice Boltzmann model (LBM) [25] to highlight the strength and weaknesses of the SC model in the description of changes in the droplet apparent contact angle observed on nano/micro structured surfaces. Despite an enormous interest and a high number of studies, many questions have not been enough addressed yet.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Wetting Dynamics of Droplet on Laser Textured Surfaces: Beyond Classical Wenzel and Cassie-Baxter Model

Omeje¹,

Itina²

2021

Preprint

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The classical wetting models, such as the Wenzel and Cassie-Baxter have been extensively used to quantify laser textured surfaces. However, these models do not provide enough explanations for wettability of femtosecond textured surfaces. In this work, we propose a continuum-level modelling to study the wetting dynamics of a water droplet on Ti-6Al-4V alloy. The calculations are performed for plain solid surfaces and surfaces with various reliefs. The calculated evolutions of the spreading parameter for both structured and non-structured surfaces not only provide explanations of several experimental results, but also underline the perspectives of using hierarchical reliefs for efficient wettability control. Thus, such simulations are shown to be useful in the relief design and laser texturing for a wide range of applications.

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A lattice Boltzmann model for substrates with regularly structured surface roughness

Cited by 19 publications

References 42 publications

Dual-Functional Superhydrophobic Textiles with Asymmetric Roll-Down/Pinned States for Water Droplet Transportation and Oil–Water Separation

Dual-Functional Superhydrophobic Textiles with Asymmetric Roll-Down/Pinned States for Water Droplet Transportation and Oil–Water Separation

Lattice Boltzmann parallel simulation of microflow dynamics over structured surfaces

Numerical Study of the Wetting Dynamics of Droplet on Laser Textured Surfaces: Beyond Classical Wenzel and Cassie-Baxter Model

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