Height functions for applying contact angles to 3D VOF simulations

Afkhami, Shahriar; Bussmann, Markus

doi:10.1002/fld.1974

Cited by 89 publications

(62 citation statements)

References 29 publications

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“…The study includes the range of low capillary numbers that we address, but the presence of crossflow makes their analysis different from ours. Our results are obtained with an in-house code based on a VOF approach, 18,25,26 which provides a simple way for treating topological changes of the interface. We implement the "height function" ͑HF͒ methodology, which yields a consistent representation of surface tension force.…”

Section: Numerical Algorithmmentioning

confidence: 99%

Numerical investigation of elongated drops in a microfluidic T-junction

2011

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We present a combined numerical and asymptotic approach for modeling droplets in microchannels. The magnitude of viscous forces relative to the surface tension force is characterized by a capillary number, Ca, which is assumed to be small. The numerical results successfully capture existing asymptotic solutions for the motion of drops in unconfined and confined flows; examples include the analytic Stokes flow solution for a two-dimensional inviscid bubble placed in an unbounded parabolic flow field and asymptotic formulas for slender bubbles and drops in confined flows. An extensive investigation of the accuracy of the computations is presented to probe the efficacy of the methodology and algorithms. Thereafter, numerical simulations are presented for droplet breakup in a symmetric microfluidic T-junction. The results are shown to support a proposed mechanism for breakup, driven by a pressure drop in a narrow gap between the droplet and the outer channel wall, which was formally derived in the limit Ca 1/5 Ӷ 1 ͓A. M. Leshansky and L. M. Pismen, "Breakup of drops in a microfluidic T junction," Phys. Fluids 21, 023303 ͑2009͔͒.

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Section: Numerical Algorithmmentioning

confidence: 99%

Numerical investigation of elongated drops in a microfluidic T-junction

2011

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“…Maric et al 2013). Additionally, a more accurate calculation of the interface curvature can be achieved by using height functions for curvature calculations (Afkhami and Bussmann 2009;Popinet 2009). These methods are at this point not incorporated in the public version of OpenFOAM.…”

Section: Discussionmentioning

confidence: 99%

A numerical technique to simulate display pixels based on electrowetting

Roghair

Musterd

Ende

et al. 2015

Microfluid Nanofluid

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“…The mass conservation equation and the momentum equation, known as Navier-Stokes equations, are needed to describe the state of any type of flow and are generally solved in computational fluid dynamics modeling. Because of the complexity of multiphase flow, several approaches have been developed to solve this problem [16][17][18]: Euler-Lagrange approach, Euler-Euler approach, and volume of fluid approach. In the volume of fluid approach [18], the flow equations are volume averaged and the interface is tracked using a phase indicator function, which is also related to the volume fraction.…”

Section: Multiphase Flowmentioning

confidence: 99%

Liquid Handling Optimization in High-Throughput Biodosimetry Tool

Bian

Tsui

Repin

et al. 2016

Journal of Medical Devices

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Due to the need of high-speed and efficient biodosimetric assays for triage and therapy in the event of radiological or nuclear attack, a robotically based automated biodosimetry tool (RABiT) has been developed over the past few years. Adapting the micronucleus assay from filter plates to V-shaped plates presented challenges in the liquid handling, namely, cell splashing out of the V-shaped well plate during the cell harvesting, poor cell distribution on the bottom of the image plate during the dispensing, and cell loss from the image plate during the aspiration in the liquid handling process. Experimental and numerical investigations were carried out to better understand the phenomena and mitigate the problems. Surface tension and contact angle among the fluids and the plate wall were accounted for in the discrete and multiphase numerical models. Experimental conditions were optimized based on the numerical results showing the relationship between nozzle speed and amount of splashed liquid, and the relationship between aspiration speed and number of escaped cells. Using these optimized parameters, numbers of micronuclei in binucleated cells showed the same dose dependence in the RABiT-prepared samples as those in the manually prepared ones. Micronucleus assay protocol was fully realized on RABiT.

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Height functions for applying contact angles to 3D VOF simulations

Cited by 89 publications

References 29 publications

Numerical investigation of elongated drops in a microfluidic T-junction

Numerical investigation of elongated drops in a microfluidic T-junction

A numerical technique to simulate display pixels based on electrowetting

Liquid Handling Optimization in High-Throughput Biodosimetry Tool

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