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Bistability in droplet traffic at asymmetric microfluidic junctions
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10.1063/1.4819276
/content/aip/journal/bmf/7/4/10.1063/1.4819276
http://aip.metastore.ingenta.com/content/aip/journal/bmf/7/4/10.1063/1.4819276

Figures

Image of FIG. 1.
FIG. 1.

(a) Sketch of the experimental setup for measurement of the effective hydrodynamic resistance to flow of a microchannel filled with droplets, . (b) Micrograph of water droplet flow in a microchannel filled with the ionic liquid, absence of contact lines indicates that the water droplets are completely encapsulated with an ionic liquid film. (c) Inset: The pressure drop across confined droplets in rectangular microchannels agrees reasonably well with the theory for inviscid bubbles. Here, and . (c) Comparison of the magnitudes of and . The effective change in the hydrodynamic resistance of microchannel caused by the presence of a single droplet is given by . Experimentally measured is less than and droplets therefore should act as discrete negative resistors when . (d) It is indeed seen that when the experimentally measured hydrodynamic resistance of a microchannel filled with droplets, is less than that of a microchannel devoid of droplets, .

Image of FIG. 2.
FIG. 2.

Schematic of repartition (a) and filter (b) regimes during droplet traffic through microfluidic loops. (c) Experimental measurements (symbols) of threshold capillary numbers for filtering droplets into the longer arm of a asymmetric loop, and in symmetric loops, (inset) agree reasonably well with the theory (solid lines).

Image of FIG. 3.
FIG. 3.

(a)–(d) Illustration of oscillatory droplet routing at a microfluidic junction; with the incoming droplet train filtering into arm of the loop, a finite pulse of the continuous phase is injected into arm to switch the filtering into the other arm. (enhanced online). (e)–(h) Plots tracking the trajectories of the droplet train at an asymmetric microfluidic loop, showing oscillatory routing; the arm into which the train is filtering into is plotted as solid black lines. The time dependent injection of the continuous phase to effect switching is represented by , which is plotted as dashed black lines. and −1 when the continuous phase at a flow rate of is injected exclusively into arms 1 and 2, respectively, and when there is no injection into either arm. [URL: http://dx.doi.org/10.1063/1.4819276.1] [URL: http://dx.doi.org/10.1063/1.4819276.2] [URL: http://dx.doi.org/10.1063/1.4819276.3] [URL: http://dx.doi.org/10.1063/1.4819276.4]doi: 10.1063/1.4819276.1.

doi: 10.1063/1.4819276.2.

doi: 10.1063/1.4819276.3.

doi: 10.1063/1.4819276.4.

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/content/aip/journal/bmf/7/4/10.1063/1.4819276
2013-08-23
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bistability in droplet traffic at asymmetric microfluidic junctions
http://aip.metastore.ingenta.com/content/aip/journal/bmf/7/4/10.1063/1.4819276
10.1063/1.4819276
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