Benchmark numerical simulations of segmented two-phase flows in microchannels using the Volume of Fluid method

Hoang, Duong A.; Steijn, Volkert van; Portela, L.M.; Kreutzer, Michiel T.; Kleijn, Chris R.

doi:10.1016/j.compfluid.2013.06.024

Cited by 199 publications

(116 citation statements)

References 46 publications

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“…Two fitting lines characterized by the power law, L d /W c ¼ 0.2Ca 20.45 , are agree well with each other. Although 3D effects are known to play an important role on the dynamics of droplet breakup and formation in microfluidic Tjunctions play, [29][30][31][32] 2D-simulation results obtained in the present study also provide good qualitative prediction on the dynamics in the T-junction. It has been reported that 3D effects become less important as the channel aspect ratio (h/W c ) decreases below 0.05.…”

Section: B Code Validationsupporting

confidence: 56%

A numerical study on the dynamics of droplet formation in a microfluidic double T-junction

et al. 2015

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In this study, droplet formations in microfluidic double T-junctions (MFDTD) are investigated based on a two-dimensional numerical model with volume of fluid method. Parametric ranges for generating alternating droplet formation (ADF) are identified. A physical background responsible for the ADF is suggested by analyzing the dynamical stability of flow system. Since the phase discrepancy between dispersed flows is mainly caused by non-symmetrical breaking of merging droplet, merging regime becomes the alternating regime at appropriate conditions. In addition, the effects of channel geometries on droplet formation are studied in terms of relative channel width. The predicted results show that the ADF region is shifted toward lower capillary numbers when channel width ratio is less than unity. The alternating droplet size increases with the increase of channel width ratio. When this ratio reaches unity, alternating droplets can be formed at very high water fraction (wf ¼ 0.8). The droplet formation in MFDTD depends significantly on the viscosity ratio, and the droplet size in ADF decreases with the increase of the viscosity ratio. The understanding of underlying physics of the ADF phenomenon is useful for many applications, including nanoparticle synthesis with different concentrations, hydrogel bead generation, and cell transplantation in biomedical therapy. V C 2015 AIP Publishing LLC. [http://dx

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Section: B Code Validationsupporting

confidence: 56%

A numerical study on the dynamics of droplet formation in a microfluidic double T-junction

et al. 2015

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“…OpenFOAM has been well verified for a number of scientific and engineering applications (Flores et al, 2013;Hoang et al, 2013). The governing equations are discretized using the finite-volume method.…”

Section: P He and S Basu: Dns Of Intermittent Turbulencementioning

confidence: 99%

Direct numerical simulation of intermittent turbulence under stably stratified conditions

Basu

2015

Nonlin. Processes Geophys.

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Abstract. In this paper, we simulate intermittent turbulence (also known as bursting events) in stably stratified openchannel flows using direct numerical simulation. Clear signatures of this intriguing phenomenon are observed for a range of stabilities. However, the spatiotemporal characteristics of intermittency are found to be strongly stability dependent. In general, the bursting events are much more frequent near the bottom wall than in the upper-channel region. A steady coexistence of laminar and turbulent flows is detected at various horizontal planes in very stable cases. This spatially intermittent pattern is found to propagate downstream and strongly correlate with the temporal evolution of intermittency. Lastly, a long standing hypothesis by Blackadar (1979), i.e., the strong connection between local stability and intermittent turbulence, is corroborated by this modeling study.

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“…We used a DNS solver based on an open-source CFD package called OpenFoam. OpenFoam has been verified for a number of scientific and engineering applications [6,7].…”

Section: Computational Detailsmentioning

confidence: 99%

Large-scale structures in a stratified open channel flow

Borynyak

Hrebtov

2017

MATEC Web Conf.

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Abstract. We present the results of direct numerical simulation of stably stratified open channel flow. The simulation was conducted in a frame of reference moving with the mean flow. The chosen setup allowed us to apply temporal filtering without affecting the long-living large-scale laminar and turbulent patches to see the dynamics of the processes on their boundaries. The main goal of the paper was to investigate the vorticity balance in different parts of the flow. It was shown that boundaries between laminar and turbulent patches contain weak large-scale vortex structures sustained by the baroclinic generation.

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Benchmark numerical simulations of segmented two-phase flows in microchannels using the Volume of Fluid method

Cited by 199 publications

References 46 publications

A numerical study on the dynamics of droplet formation in a microfluidic double T-junction

A numerical study on the dynamics of droplet formation in a microfluidic double T-junction

Direct numerical simulation of intermittent turbulence under stably stratified conditions

Large-scale structures in a stratified open channel flow

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