Inverse Saffman-Taylor Experiments with Particles Lead to Capillarity Driven Fingering Instabilities

Bihi, Ilyesse; Baudoin, Michaël; Butler, Jason E.; Faille, Christine; Zoueshtiagh, Farzam

doi:10.1103/physrevlett.117.034501

Cited by 18 publications

(12 citation statements)

References 24 publications

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“…Such inverse Saffman-Taylor instabilities can occur when there are wettable particles present that can adsorb to the air/fluid interface. This adsorption, due to interfacial energy minimization, can induce interfacial instabilities 78 . It is known that bacteria can accumulate at interfaces 79 , and B. subtilis can form floating biofilms at air/water interfaces.…”

Section: Discussionmentioning

confidence: 99%

Density and temperature controlled fluid extraction in a bacterial biofilm is determined by poly-γ-glutamic acid production

Morris

Sukhodub

MacPhee

et al. 2020

Preprint

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A hallmark of microbial biofilms is the self-production of extracellular matrix that encases the cells resident within the community. The matrix provides protection from the environment, while spatial heterogeneity of expression influences the structural morphology and colony spreading dynamics. Bacillus subtilis is a model bacterial system used to uncover the regulatory pathways and key building blocks required for biofilm growth and development. Previous reports have suggested that poly-γ-glutamic acid (PGA) production is suppressed during biofilm formation and does not play a major role in biofilm morphology of the undomesticated isolate NCIB 3610. In this work we report on the observation of multiple travelling fronts that develop during the early stage of B. subtilis colony biofilm formation. We find the emergence of a highly motile population of bacteria that is facilitated by the extraction of fluid from the underlying agar substrate. Motility develops behind a moving front of fluid that propagates from the boundary of the biofilm towards the interior. The extent of proliferation is strongly modulated by the presence of extracellular polysaccharides (EPS). We trace the origin of this moving front of fluid to the production of PGA. We find that PGA production is correlated with higher temperatures, resulting in a mature biofilm morphology that is distinct from the biofilm architecture typically associated with B. subtilis. Our results suggest that B. subtilis NCIB 3610 produces distinct biofilm matrices in response to environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Density and temperature controlled fluid extraction in a bacterial biofilm is determined by poly-γ-glutamic acid production

Morris

Sukhodub

MacPhee

et al. 2020

Preprint

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“…There are many studies on the displacement in the porous media or Hele-Shaw cells under hydrodynamically unstable and stable conditions of the interface with and without chemical reactions [7,[11][12][13][14]. Although the unstable interfaces on the fully miscible and immiscible systems in hydrodynamically stable displacement have been reported by many papers, research on specialized conditions such as prewetting condition [15][16][17], including particles [18][19][20][21], viscosity-change reaction at the interface [22][23][24][25], precipitation reaction [26], and double diffusivity effect [27] is limited. Studies on the partially miscible system have recently received a lot of attention because of its application in enhanced oil recovery [5].…”

Section: Introductionmentioning

confidence: 99%

Fluid Morphologies Governed by the Competition of Viscous Dissipation and Phase Separation in a Radial Hele-Shaw Flow

et al. 2020

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The displacement of a less viscous fluid by a more viscous fluid in a radial Hele-Shaw cell makes a circular pattern because the interface is hydrodynamically stable in this condition. Very recently, it has been experimentally reported that the hydrodynamically stable displacement in a partially miscible system induces fingering patterns while stable circular patterns are made at fully miscible and immiscible systems. The fingering instability in the partially miscible system results from complex and entangled elements involving viscous dissipation, molecular diffusion, and phase separation. The analyzing mechanism requires a quantitative relationship between the hydrodynamic interfacial fingering patterns and underlying physicochemical properties. Here, we experimentally investigated the change in fluid patterns formed by the progression of phase separation in the partially miscible systems and categorized them into three patterns: finger-like pattern, annular-like pattern, and circular pattern. Moreover, we propose the mechanism of the pattern formation by an interfacial tension measurement and evaluate the patterns by modified capillary number and newly defined body force ratio, Bf. Our analysis revealed that the deformation index of the pattern can be expressed as a function of Bf on a single curve regardless of the miscibility.

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“…As a result viscous fingering has been shown to play a role in enhancing mixing at the interface of two fluids, however, the degree of mixing is highly dependent on the specific viscosity ratio 20 . In particular, it has also been shown that when the invading fluid is more viscous than the resident fluid, the front usually remains stable 21,22 reducing the mixing potential.…”

Section: Introductionmentioning

confidence: 99%

Direct experimental observations of the impact of viscosity contrast on convective mixing in a three-dimensional porous medium

et al. 2020

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Analog fluids have been widely used to mimic the convective mixing of carbon dioxide into brine in the study of geological carbon storage. Although these fluids systems had many characteristics of the real system, the viscosity contrast between the resident fluid and the invading front was significantly different and largely overlooked. We used X-ray computed tomography to image convective mixing in a three-dimensional porous medium formed of glass beads and compared two invading fluids which had a viscosity 3.5× and 16× that of the resident fluid. The macroscopic behavior such as the dissolution rate and onset time, scaled well with the viscosity contrast. However with a more viscous invading fluid fundamentally different plume structures and final mixing state were observed due in large part to greater dispersion.

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Inverse Saffman-Taylor Experiments with Particles Lead to Capillarity Driven Fingering Instabilities

Cited by 18 publications

References 24 publications

Density and temperature controlled fluid extraction in a bacterial biofilm is determined by poly-γ-glutamic acid production

Density and temperature controlled fluid extraction in a bacterial biofilm is determined by poly-γ-glutamic acid production

Fluid Morphologies Governed by the Competition of Viscous Dissipation and Phase Separation in a Radial Hele-Shaw Flow

Direct experimental observations of the impact of viscosity contrast on convective mixing in a three-dimensional porous medium

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