Lattice Boltzmann method for electrowetting modeling and simulation

Aminfar, Habib; Mohammadpourfard, Mousa

doi:10.1016/j.cma.2009.08.021

Cited by 27 publications

(26 citation statements)

References 35 publications

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“…By defining the electrostatic energy, the chemical free energy, and the mechanical free energy, surface tensions values can be found by energy minimization. In recent works performed by Aminfar and Mohammadpourfard, the free energy-based LB method successfully simulated the translation and merge of droplets under EWOD actuation ( Figure 11) (48,54).…”

Section: Simulation Methodsmentioning

confidence: 97%

“…To avoid the singularity at the contact line, the constraint is usually relaxed by specifying a slip length (47). Locally modeling this region requires the use of noncontinuum methods such as Lattice Boltzmann (48) or molecular dynamics (49). Given these complexities, several simplified modeling approaches are used extensively with various levels of approximation.…”

Section: Simulation Methodsmentioning

confidence: 99%

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Electrowetting Effect: Theory, Modeling, and Applications

Crane

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

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Electrowetting is a phenomenon in which an electric field at a fluid interface changes the equilibrium interface position. This is generally observed as a quadratic relationship between the applied voltage and the change in the cosine of the apparent contact angle. While the phenomena were first observed more than 100 years ago, until recently, applications were limited by poor reliability. The application of modern materials and manufacturing methods has enabled the fabrication of a wide range of devices that show excellent repeatability. Applications range from focusing lenses to miniature biomedical diagnostics and optical displays. The article reviews the basic electrowetting phenomena, the characteristics of key configurations, and key materials issues in fabricating reliable electrowetting devices. Some practical applications and modeling approaches of the electrowetting phenomena are also reviewed.

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Section: Simulation Methodsmentioning

confidence: 97%

Section: Simulation Methodsmentioning

confidence: 99%

Electrowetting Effect: Theory, Modeling, and Applications

Crane

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

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“…Examples include dynamic wetting (D'Ortona et al 1995;Zhang and Kwok 2004b;Briant et al 2002;, capillary filling (Raiskinmaki et al 2002;Wolf et al 2010;Kusumaatmaja et al 2008;Chibbaro et al 2009a;Diotallevi et al 2008Diotallevi et al , 2009a, contact angles and droplet behaviors on patterned (Zhang et al 2009b;Kusumaatmaja et al 2006;Chang and Alexander 2006), heterogeneous (Iwahara et al 2003;Zhang and Kwok 2005b;Dupuis and Yeomans 2004), and rough (Raiskinmaki et al 2000;Kwok 2006a, 2010;Hyvaluoma et al 2007) surfaces. Recently, electrowetting, the increase of contact angle under an applied electrical potential across the liquid and surface, has also been simulated, using the Shan-Chen interparticle potential model (Li and Fang 2009) or the free energy model (Aminfar and Mohammadpourfard 2009). The wettability controlling parameter, the solid-fluid interaction or the surface energy, is related to the applied voltage (Li and Fang 2009) or the electrical potential field (Aminfar and Mohammadpourfard 2009).…”

Section: Multiphase Flows and Surface Effectsmentioning

confidence: 99%

“…Recently, electrowetting, the increase of contact angle under an applied electrical potential across the liquid and surface, has also been simulated, using the Shan-Chen interparticle potential model (Li and Fang 2009) or the free energy model (Aminfar and Mohammadpourfard 2009). The wettability controlling parameter, the solid-fluid interaction or the surface energy, is related to the applied voltage (Li and Fang 2009) or the electrical potential field (Aminfar and Mohammadpourfard 2009). However, these studies did not reflect the underlying mechanism, such as ion accumulation and electrical force near the solid-liquid interface and contact point and how they affect the contact angle (Mugele and Baret 2005).…”

Section: Multiphase Flows and Surface Effectsmentioning

confidence: 99%

Lattice Boltzmann method for microfluidics: models and applications

Zhang

2010

Microfluid Nanofluid

357

172

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The lattice Boltzmann method (LBM) has experienced tremendous advances and has been well accepted as a useful method to simulate various fluid behaviors. For computational microfluidics, LBM may present some advantages, including the physical representation of microscopic interactions, the uniform algorithm for multiphase flows, and the easiness in dealing with complex boundary. In addition, LBM-like algorithms have been developed to solve microfluidics-related processes and phenomena, such as heat transfer, electric/magnetic field, and diffusion. This article provides a practical overview of these LBM models and implementation details for external force, initial condition, and boundary condition. Moreover, recent LBM applications in various microfluidic situations have been reviewed, including microscopic gaseous flows, surface wettability and solid-liquid interfacial slip, multiphase flows in microchannels, electrokinetic flows, interface deformation in electric/magnetic field, flows through porous structures, and biological microflows. These simulations show some examples of the capability and efficiency of LBM in computational microfluidics.

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“…Recently, the free energy based LBM has been successfully employed for modeling and simulation of some of EW operations, i.e., droplet spreading, motion, and splitting in three dimensions [14,15]. In this paper in addition to simulation of droplets merging, one other application of EW, also the same method is applied to study of interesting issues such as instability (evaporation) of droplets in a system with finite size (i.e., the finite systems) [16].…”

Section: Introductionmentioning

confidence: 99%

Droplets Merging and Stabilization by Electrowetting: Lattice Boltzmann Study

Aminfar

Mohammadpourfard

2012

Journal of Adhesion Science and Technology

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In this paper, the free energy based Lattice Boltzmann Method (LBM) which has been recently extended by the authors for modeling and simulation of Electrowetting (EW) phenomenon is applied to another application of EW, i.e., droplets merging. The results were compared with experimental data and the results show good accuracy of the numerical simulation. Also, the stability of a droplet in a finite system was studied analytically and numerically (by LBM) and it was shown that the droplet stability is a function of system size and droplet contact angle. The simulation results were in good agreement with analytical solution and it has been concluded that in the finite systems an unstable droplet can be stabilized by applying a voltage (i.e., using EW). Based on this observation, a new method for droplets merging in finite systems has been proposed.

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Lattice Boltzmann method for electrowetting modeling and simulation

Cited by 27 publications

References 35 publications

Electrowetting Effect: Theory, Modeling, and Applications

Electrowetting Effect: Theory, Modeling, and Applications

Lattice Boltzmann method for microfluidics: models and applications

Droplets Merging and Stabilization by Electrowetting: Lattice Boltzmann Study

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