Tip streaming from a liquid drop forming from a tube in a co-flowing outer fluid

Suryo, Ronald; Basaran, Osman A.

doi:10.1063/1.2335621

Cited by 138 publications

(115 citation statements)

References 74 publications

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“…Table 2 provides references to several recent experimental reports. Numerical simulations of breakup in microfluidic geometries have also been conducted, see for example studies of axisymmetric geometries by Jensen, Stone & Bruus (2006), Suryo & Basaran (2006) and Zhou, Yue & Feng (2006). For a thorough up-to-date review of drop formation in microfluidic devices see Christopher & Anna (2007).…”

Section: Introductionmentioning

confidence: 99%

Transition from squeezing to dripping in a microfluidic T-shaped junction

et al. 2008

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We describe the results of a numerical investigation of the dynamics of breakup of streams of immiscible fluids in the confined geometry of a microfluidic T-junction. We identify three distinct regimes of formation of droplets: squeezing, dripping and jetting, providing a unifying picture of emulsification processes typical for microfluidic systems. The squeezing mechanism of breakup is particular to microfluidic systems, since the physical confinement of the fluids has pronounced effects on the interfacial dynamics. In this regime, the breakup process is driven chiefly by the buildup of pressure upstream of an emerging droplet and both the dynamics of breakup and the scaling of the sizes of droplets are influenced only very weakly by the value of the capillary number. The dripping regime, while apparently homologous to the unbounded case, is also significantly influenced by the constrained geometry; these effects modify the scaling law for the size of the droplets derived from the balance of interfacial and viscous stresses. Finally, the jetting regime sets in only at very high flow rates, or with low interfacial tension, i.e. higher values of the capillary number, similar to the unbounded case.

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Section: Introductionmentioning

confidence: 99%

Transition from squeezing to dripping in a microfluidic T-shaped junction

et al. 2008

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“…In flow-focusing devices, it is possible to create long jets, but in general these eventually break up due to jetting or dripping. 3 The thread stability can be significantly increased by using specific geometries, 4 surfactants, 5,6 or visco-elastic fluids. 7 Another route to generate strings is by coalescence in a confined blend.…”

Section: Introductionmentioning

confidence: 99%

Stability and breakup of confined threads

2012

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A boundary-integral method for periodic arrays of drops, threads or sheets between parallel walls is presented. The Green's functions take the form of a far-field HeleShaw description, which is used to generate periodic Green's functions for the parallel-wall configuration. The method is applied to study the effect of confinement on the breakup of threads. A comparison is made with classical Tomotika's theory and growth rates parallel and perpendicular to the walls are determined as a function of confinement ratio. Contrary to existing belief, we find that confined threads are not stable, but that the time for breakup increases with confinement and viscosity ratio, at least for threads whose diameter is smaller than the wallspacing. We also show the in-phase and out-of-phase breakup for an array of threads, as well as the stabilizing effect of shear flow.

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confidence: 99%

Global stability of stretched jets: conditions for the generation of monodisperse micro-emulsions using coflows

2013

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In this paper we reveal the physics underlaying the conditions needed for the generation of emulsions composed of uniformly sized drops of micrometric or submicrometric diameters when two immiscible streams flow in parallel under the so-called tip streaming regime after Suryo & Basaran (2006). Indeed, when inertial effects in both liquid streams are negligible, the inner to outer flow-rate and viscosity ratios are small enough and the capillary number is above an experimentally determined threshold which is predicted by our theoretical results with small relative errors, a steady micron-sized jet is issued from the apex of a conical drop. Under these conditions, the jet disintegrates into drops with a very well defined mean diameter, giving rise to a monodisperse microemulsion. Here, we demonstrate that the regime in which uniformly-sized drops are produced corresponds to values of the capillary number for which the cone-jet system is globally stable. Interestingly enough, our general stability theory reveals that liquid jets with a cone-jet structure are much more stable than their cylindrical counterparts thanks, mostly, to a capillary stabilization mechanism described here for the first time. Our findings also limit the validity of the type of stability analysis based on the common parallel flow assumption to only those situations in which the liquid jet diameter is almost constant.

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Tip streaming from a liquid drop forming from a tube in a co-flowing outer fluid

Abstract: Response of an emulsion of leaky dielectric drops immersed in a simple shear flow: Drops less conductive than the suspending fluid

Cited by 138 publications

References 74 publications

Transition from squeezing to dripping in a microfluidic T-shaped junction

Transition from squeezing to dripping in a microfluidic T-shaped junction

Stability and breakup of confined threads

Global stability of stretched jets: conditions for the generation of monodisperse micro-emulsions using coflows

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