Selection of Two-Phase Flow Patterns at a Simple Junction in Microfluidic Devices

Engl, Wilfried; Ohata, Koji; Guillot, Pierre; Colin, Annie; Panizza, Pascal

doi:10.1103/physrevlett.96.134505

Cited by 16 publications

(8 citation statements)

References 7 publications

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“…We show that the size of the loop is an important parameter. In the large-loop situation, i.e., when the two arms are at least six times longer than the bubble size, as shown in previous studies [4][5][6][7][8][9][10][11][12][13], we evidence a filtering and a transition regime. Strikingly and contrary to previous studies [9,[14][15][16][17] in the repartition regime situation, we point out that the hydrodynamic resistances or the total flow rates are never equal in the two arms.…”

Section: Introductionsupporting

confidence: 84%

“…Strikingly and contrary to previous studies [9,[14][15][16][17] in the repartition regime situation, we point out that the hydrodynamic resistances or the total flow rates are never equal in the two arms. We note that this point was suggested by Engl [6] but not evidenced experimentally. In this new regime where interactions between bubbles cannot be neglected, we show that for low and moderate bubble densities, the continuous phase flow rates are equal in the two arms.…”

Section: Introductionmentioning

confidence: 54%

“…In the last decades, these issues have stimulated many works [4][5][6][7][8][9][10][11][12][13]. These studies focus on a simple geometry: a simple loop or a simple junction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dense bubble traffic in microfluidic loops: Selection rules and clogging

2016

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We study the repartition of monodisperse bubbles at the inlet node of an asymmetric microfluidic loop for low to high bubble densities. In large loops, we evidence a new regime. Contrary to the classical belief, we point out that bubbles are directed not towards the arm having the higher total flow rate but towards the arm with the higher water flow rate at low and moderate relative gas flow rates. At higher rates, they enter the longer arm when they reach close packing in the shorter arm. In small loops, we evidence a clogging regime at high relative gas flow rates. Collisions between bubbles coming from the two arms at the outlet clog the longer arm. We propose a comprehensive analysis allowing us to explain these results.

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Section: Introductionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 54%

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Dense bubble traffic in microfluidic loops: Selection rules and clogging

2016

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“…Gas bubbles and reagent-filled aqueous drops are alternately formed at a microfluidic T-junction and subsequently assemble downstream into an ordered foam lattice (Movie M2 in Supporting Information). , The injected gas periodically clears reagents from the T-junction, thereby preventing reagent buildup and nanoparticle deposition that occurs when laminar fluid streams are left undisturbed. , These features are a significant advance over current droplet-based microfluidic synthesis methods, where droplet formation is sensitive to fluid properties such as interfacial tension, and downstream droplet coalescence is a frequent occurrence …”

Section: Resultsmentioning

confidence: 99%

Plasmonic Nanoshell Synthesis in Microfluidic Composite Foams

Duraiswamy

Khan

2010

Nano Lett.

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The availability of robust, scalable, and automated nanoparticle manufacturing processes is crucial for the viability of emerging nanotechnologies. Metallic nanoparticles of diverse shape and composition are commonly manufactured by solution-phase colloidal chemistry methods, where rapid reaction kinetics and physical processes such as mixing are inextricably coupled, and scale-up often poses insurmountable problems. Here we present the first continuous flow process to synthesize thin gold "nanoshells" and "nanoislands" on colloidal silica surfaces, which are nanoparticle motifs of considerable interest in plasmonics-based applications. We assemble an ordered, flowing composite foam lattice in a simple microfluidic device, where the lattice cells are alternately aqueous drops containing reagents for nanoparticle synthesis or gas bubbles. Microfluidic foam generation enables precisely controlled reagent dispensing and mixing, and the ordered foam structure facilitates compartmentalized nanoparticle growth. This is a general method for aqueous colloidal synthesis, enabling continuous, inherently digital, scalable, and automated production processes for plasmonic nanomaterials.

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“…For example, bubbles and droplets can breakup or do not breakup at the T‐junction, depending mainly on their sizes and the capillary number . For the nonbreaking case, repartition and filtering regimes are observed, owing to the flow rates in the arms of the junctions . Jeanneret et al recently focused on the transport of particles in one‐dimensional loop networks and showed that the dynamics is asymptotically invariant upon time‐reversal symmetry.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic feedback on bubble breakup at a T‐junction within an asymmetric loop

2014

AIChE Journal

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International audienceBubble breakup at a microfluidic T-junction by taking into consideration the hydrodynamic feedback at the downstream channels is presented. Experiments are conducted in square microchannels with 400 mu m in width. The splitting ratio of the bubble size in the bifurcations varies nonmonotonically with the flow rate ratio of gas/liquid phases, and it is also affected by the liquid viscosity. A critical size of the mother bubble determines the variation trend of the splitting ratio of bubble size with flow rates of both phases and the liquid viscosity, which is related to the different breakup mechanisms for long and short bubbles at the junction and the different additional resistances induced by long and short bubbles in downstream channels. A theoretical model is proposed to predict the tailoring size of bubbles at the T-junction by taking into account of the additional resistance in the presence of bubbles in downstream channels

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Selection of Two-Phase Flow Patterns at a Simple Junction in Microfluidic Devices

Cited by 16 publications

References 7 publications

Dense bubble traffic in microfluidic loops: Selection rules and clogging

Dense bubble traffic in microfluidic loops: Selection rules and clogging

Plasmonic Nanoshell Synthesis in Microfluidic Composite Foams

Hydrodynamic feedback on bubble breakup at a T‐junction within an asymmetric loop

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