Ordered and Disordered Patterns in Two-Phase Flows in Microchannels

Dreyfus, Rémi; Tabeling, Patrick; Willaime, Hervé

doi:10.1103/physrevlett.90.144505

Cited by 354 publications

(292 citation statements)

References 6 publications

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“…In ͑6͒, the surface tension pressure jump across the interface has been taken into account in spite that, for the typical values of the different variables in our experiments Ca Ϫ1 /␣ b ՇO(0.1). As an important consequence, bubble formation is not controlled by surface tension as in other related experiments, 15 where the wetting properties of the liquids and materials used affect the stability of the flow patterns obtained. In the subsequent analysis, we will neglect surface tension pressure drop.…”

Section: ͑7͒mentioning

confidence: 84%

A new device for the generation of microbubbles

et al. 2004

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In this paper we present a new method for the production of bubble-liquid suspensions ͑from now on BLS͒ composed of micron-sized bubbles and with gas to liquid volume ratios larger than unity. We show that the BLS gas fraction ϭQ g /Q l , being Q g and Q l the flow rates of gas and liquid, respectively, is controlled by a dimensionless parameter which accounts for the ratio of the gas pressure inside the device to the liquid viscous pressure drop from the orifices where the liquid is injected to the exit, where the BLS is obtained. This parameter permits the correct scaling of the BLS gas volume fraction of all the experiments presented.

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Section: ͑7͒mentioning

confidence: 84%

A new device for the generation of microbubbles

et al. 2004

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“…Most commonly used microemulsification devices include T-junctions (Christopher and Anna 2007;Dreyfus et al 2003;Link et al 2004;Nisisako et al 2002;Thorsen et al 2001;Garstecki et al 2006), flow-focusing devices (Anna et al 2003;Ganan-Calvo 1998;Ganan-Calvo and Gordillo 2001;Xu and Nakajima 2004;Garstecki et al 2004), and devices in which liquid threads break on the terraces of microchannels (Sugiura et al 2001(Sugiura et al , 2002a. Since the generation of droplets with a predictable and reproducible size and size distribution determines their potential applications (including the synthesis of polymer colloids), several research groups have explored various aspects of the process of emulsification (Seo et al 2005a;Xu et al 2005;Zhang et al 2006;Cygan et al 2005;El-Ali et al 2005;Garstecki et al 2005a;Hudson et al 2005;Jensen and Lee 2004;Khan et al 2004;Song et al 2003;Zheng and Ismagilov 2005;Zheng et al 2003) .…”

Section: Introductionmentioning

confidence: 99%

Emulsification in a microfluidic flow-focusing device: effect of the viscosities of the liquids

Nie

Seo

et al. 2008

Microfluid Nanofluid

326

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We report the results of a comparative study of microfluidic emulsification of liquids with different viscosities. Depending on the properties of the fluids and their rates of flow, emulsification occurred in the dripping and jetting regimes. We studied the characteristic features and typical dependence of the size and of the size distribution of droplets in each regime. For each liquid, we identified a range of hydrodynamic conditions promoting generation of highly monodisperse droplets. Viscosity played an important role in emulsification: highly viscous liquids were emulsified into larger droplets with lower polydispersity. Although it was not possible to provide a unified scaling for the volumes of the droplets, our results suggest that the break-up dynamics of the lower viscosity fluids resembles the rate-of-flow-controlled break-up, as reported earlier for the formation of bubbles in flow-focusing geometries [Garstecki P, Stone HA, Whitesides GM (2005) Phys Rev Lett 94:164501]. The results of this study can be helpful for a rationalized selection of liquids for the controlled formation of droplets with a predetermined size and with a narrow distribution of sizes.

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“…Indeed, a drop may be formed with a known composition and volume [5,6,7] and transported by an inert fluid without loss of the solute species and without cross-contamination [8]. Furthermore, fusion of two drops containing two reactive species leads to the onset, on demand, of a reaction [9] whose product may be sampled by breaking the drop at a bifurcation [10].…”

Section: Introductionmentioning

confidence: 99%

An optical toolbox for total control of droplet microfluidics

2007

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The use of microfluidic drops as microreactors hinges on the active control of certain fundamental operations, such as droplet formation, transport, division and fusion. Recent work has demonstrated that local heating from a focused laser can apply a thermocapillary force on a liquid interface sufficient to block the advance of a droplet in a microchannel (Baroud et al., Phys. Rev. E. V 75, p.046302). Here, we demonstrate the usefulness of this optical approach by implementing the operations mentioned above, without the need for any special microfabrication or moving parts. Building blocks such as a droplet valve, sorter, fuser, or divider are shown, as is the combination of a valve and fuser using a single laser spot.

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Ordered and Disordered Patterns in Two-Phase Flows in Microchannels

Cited by 354 publications

References 6 publications

A new device for the generation of microbubbles

A new device for the generation of microbubbles

Emulsification in a microfluidic flow-focusing device: effect of the viscosities of the liquids

An optical toolbox for total control of droplet microfluidics

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