3-D numerical simulation of contact angle hysteresis for microscale two phase flow

Chen, Fang; Hidrovo, Carlos; Wang, Fu Min; Eaton, John K.; Goodson, Kenneth E.

doi:10.1016/j.ijmultiphaseflow.2007.08.008

Cited by 103 publications

(64 citation statements)

References 27 publications

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“…In summary, for the optimization of the design and the operating condition of microfluidic two-phase flow systems, the ability to predict flow patterns [22,23,48] and to simulate surface tension effects [49][50][51] is significant. The LB method is found to be among the better numerical tools when it comes to the bubble/slug dynamics and liquid/gas interface dynamics [52]. The objective of this paper is to apply the two-phase lattice-Boltzmann model based on the fluid mediator to study the immiscible kerosene-water flow in a T-shaped microchannel to validate the two-phase LB model.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of immiscible liquid-liquid flow in microchannels using lattice Boltzmann method

et al. 2011

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Immiscible kerosene-water two-phase flows in microchannels connected by a T-junction were numerically studied by a Lattice Boltzmann (LB) method based on field mediators. The two-phase flow lattice Boltzmann model was first validated and improved by several test cases of a still droplet. The five distinct flow regimes of the kerosene-water system, previously identified in the experiments from Zhao et al., were reproduced. The quantitative and qualitative agreement between the simulations and the experimental data show the effectiveness of the numerical method. The roles of the interfacial tension and contact angle on the flow patterns and shapes of droplets were discussed and highlighted according to the numerical results based on the improved two-phase LB model. This work demonstrated that the developed LBM simulator is a viable tool to study immiscible two-phase flows in microchannels, and such a tool could provide tangible guidance for the design of various microfluidic devices that involve immiscible multi-phase flows.lattice Boltzmann method, immiscible two-phase flow, numerical simulation, microchannel, kerosene-water system

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of immiscible liquid-liquid flow in microchannels using lattice Boltzmann method

et al. 2011

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“…Renardy et al (2001) reconstructed the interface normal vector close to the contact line in such a way that the contact angle takes the prescribed value. Recently, Fang et al (2008) proposed a 3D contact line hysteresis model for the PLIC-VOF method. In their approach, the local contact angle becomes a function of the local contact line velocity.…”

Section: Models For Surface Tensionmentioning

confidence: 99%

“…and reported good agreement with experimental data. Fang et al (2008) performed 3D PLIC-VOF simulations of liquid slugs which are formed by the inflow of water through a slit in the bottom of a rectangular microchannel (with a main air flow). They noted that for good agreement with the experiments it was essential to take into account contact line hysteresis, which is responsible for the slug elongation and the post-detachment instability.…”

Section: Topological Changesmentioning

confidence: 99%

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Wörner

2012

Microfluid Nanofluid

364

197

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This article presents a comprehensive review of numerical methods and models for interface resolving simulations of multiphase flows in microfluidics and micro process engineering. The focus of the paper is on continuum methods where it covers the three common approaches in the sharp interface limit, namely the volumeof-fluid method with interface reconstruction, the level set method and the front tracking method, as well as methods with finite interface thickness such as color-function based methods and the phase-field method. Variants of the mesoscopic lattice Boltzmann method for two-fluid flows are also discussed, as well as various hybrid approaches. The mathematical foundation of each method is given and its specific advantages and limitations are highlighted. For continuum methods, the coupling of the interface evolution equation with the single-field Navier-Stokes equations and related issues are discussed. Methods and models for surface tension forces, contact lines, heat and mass transfer and phase change are presented. In the second part of this article applications of the methods in microfluidics and micro process engineering are reviewed, including flow hydrodynamics (separated and segmented flow, bubble and drop formation, breakup and coalescence), heat and mass transfer (with and without chemical reactions), mixing and dispersion, Marangoni flows and surfactants, and boiling.

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“…The difference between the two angles θ = θ A − θ R is defined as the contact angle hysteresis. 6 The smaller the contact angle hysteresis is, the faster the droplet moves on the solid surface. Many factors led to the contact line hysteresis phenomenon, for instance, the surface roughness and heterogeneity.…”

Section: The Theoretical Basis Of Ewodmentioning

confidence: 99%

Evaluation of the threshold trimming method for micro inertial fluidic switch based on electrowetting technology

Liu

Yang

et al. 2014

AIP Advances

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The switch based on electrowetting technology has the advantages of no moving part, low contact resistance, long life and adjustable acceleration threshold. The acceleration threshold of switch can be fine-tuned by adjusting the applied voltage. This paper is focused on the electrowetting properties of switch and the influence of microchannel structural parameters, applied voltage and droplet volume on acceleration threshold. In the presence of process errors of micro inertial fluidic switch and measuring errors of droplet volume, there is a deviation between test acceleration threshold and target acceleration threshold. Considering the process errors and measuring errors, worst-case analysis is used to analyze the influence of parameter tolerance on the acceleration threshold. Under worst-case condition the total acceleration threshold tolerance caused by various errors is 9.95%. The target acceleration threshold can be achieved by fine-tuning the applied voltage. The acceleration threshold trimming method of micro inertial fluidic switch is verified.

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3-D numerical simulation of contact angle hysteresis for microscale two phase flow

Cited by 103 publications

References 27 publications

Numerical simulation of immiscible liquid-liquid flow in microchannels using lattice Boltzmann method

Numerical simulation of immiscible liquid-liquid flow in microchannels using lattice Boltzmann method

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Evaluation of the threshold trimming method for micro inertial fluidic switch based on electrowetting technology

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