Charge-Induced Saffman-Taylor Instabilities in Toroidal Droplets

Fragkopoulos, Alexandros; Aizenman, A.; Fernández‐Nieves, Alberto

doi:10.1103/physrevlett.118.264501

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…Viscous fingering effects are often described by the prevalent ratio of fluid viscosities, M, and the capillary number, Ca, which compares the viscous with capillary forces. Recent experimental investigations have revealed the feasibility on manipulating viscous fingering instabilities with flow geometry, [23][24][25][26][27][28][29][30] the alteration of the used fluid system, [31][32][33] for example, by additive surfactants, [34,35] and the wettability of the solid structure. [17,[36][37][38][39][40] Notably, wettability can only be considered as a sum parameter of different micro-scale effects.…”

Section: Introductionmentioning

confidence: 99%

Surface Charge Affecting Fluid–Fluid Displacement at Pore Scale

Kalde

Lippold

Loelsberg

et al. 2022

Adv Materials Inter

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Efficiency in fluid–fluid displacement is drastically reduced by viscous fingering, limiting the overall effectiveness in enhanced oil recovery, membrane science, and lateral flow devices used in biomedical applications. Local instabilities at the fluid–fluid interface lead to finger‐like patterns when a less viscous fluid displaces an immiscible fluid of higher viscosity. This widely observed phenomenon in multiphase flow inside porous media is infamously intricate to control, especially for given geometry and viscosity ratio. The presented study uses a highly controlled microfluidic porous network structure with tailored ionic surface strength. The direct correlation of viscous fingering evolution on the porous structure's zeta potential at a pore‐scale level is demonstrated via polyelectrolyte coatings using a layer‐by‐layer technique. Displacement patterns are tuned from vigorous viscous fingering over stable displacement to corner flow events across a broad range of capillary numbers depending on the applied coatings. The experimental data show an increasing trend of oil recovery with increasing surface wettability, consistent with several previous findings. Furthermore, the results reveal that surface zeta potential correlates positively with recovery rate but negatively with the displacement stability quantified by the fractal dimension. These insights enable a more targeted porous media design to obtain optimal multiphase flow control.

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Section: Introductionmentioning

confidence: 99%

Surface Charge Affecting Fluid–Fluid Displacement at Pore Scale

Kalde

Lippold

Loelsberg

et al. 2022

Adv Materials Inter

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“…External force fields are often used to initiate or manipulate the microscopic flow via hydrodynamic instabilities for various purposes. Electrical charging may lead to destabilisation of toroidal droplets according to the Saffman–Taylor theory 8 while in tapered Hele-Shaw cells 9 or electrically manipulated electrolytes 10 the fingering pattern can be controlled. In some cases, a combination of the applied external forces results in the liquid microflow instability, too 6 .…”

Section: Introductionmentioning

confidence: 99%

Dynamics of microflow at the plasma–liquid interface

Kuthanová

Hoder

2022

Sci Rep

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We study the interaction of microplasma with viscous liquid in a narrow gap. The reduced surface tension and viscosity of the liquid droplet from local plasma-heating induce a radial fingering. The introduced methodology enables spatially and temporally resolved quantification of dissipated power density and of resulting velocity of the advancing plasma–liquid interface. For two plasma power scenarios, we demonstrate how the irregular distribution of the two parameters leads to microflow, interface stretching, and to primary droplet fragmentation via capillary instability and end pinching.

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“…Research on the VF instability can be traced back to the 1950s [16,17]. After 70 years, the driving modes of this instability have developed into electric field drive [18], electric field and pressure gradient codrive [19], and so on. However, there is still something unclear about the traditional pressure gradient driving mode.…”

Section: Introductionmentioning

confidence: 99%

Control of viscous fingering: From the perspective of energy evolution

Yuan

2021

Phys. Rev. Fluids

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Improving the ability to control viscous fingering instabilities plays an essential role in a wide variety of scientific and engineering fields. Based on linear stability analysis, we present an energy model characterized by the viscous dissipation rate, which can reflect the evolution process of the fluid-fluid interface, and predictions of control schemes are obtained from the model. One type of scheme is to control the morphological patterns of instability through initial disturbances. Another series of schemes is to control whether the viscous fingering instability is suppressed or continues to develop by different scaling laws of injection rate versus time based on the variational method. Furthermore, a stable and continual forward movement of the interface is achieved by a periodic suppression scheme, which is significant in practical applications. The effectiveness of the energy model and all control schemes are well verified by experiments.

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Charge-Induced Saffman-Taylor Instabilities in Toroidal Droplets

Cited by 6 publications

References 18 publications

Surface Charge Affecting Fluid–Fluid Displacement at Pore Scale

Surface Charge Affecting Fluid–Fluid Displacement at Pore Scale

Dynamics of microflow at the plasma–liquid interface

Control of viscous fingering: From the perspective of energy evolution

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