Schlieren imaging of viscous fingering in a horizontal Hele-Shaw cell

Bunton, Patrick; Marin, Daniela; Stewart, Simone; Meiburg, Eckart; Wit, A. De

doi:10.1007/s00348-016-2121-0

Cited by 16 publications

(18 citation statements)

References 31 publications

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“…The concentration field is influenced both by the flow and by the concentration changes due to the precipitation reaction. 19,20 Furthermore, the shadowgraph optics is able to image precipitate membranes which may appear transparent in the direct camera records. 3 Results and discussion…”

Section: Experimental Conditionsmentioning

confidence: 99%

Influence of microscopic precipitate structures on macroscopic pattern formation in reactive flows in a confined geometry

Balog

Bittmann

Schwarzenberger

et al. 2019

Phys. Chem. Chem. Phys.

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Section: Experimental Conditionsmentioning

confidence: 99%

Influence of microscopic precipitate structures on macroscopic pattern formation in reactive flows in a confined geometry

Balog

Bittmann

Schwarzenberger

et al. 2019

Phys. Chem. Chem. Phys.

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“…There are a lot of experimental methods for studying the characteristics of such reactive liquid systems and instabilities. High-precision optical methods, which are based, for example, on interferometry [5] or shadowgraph technique [6], are employed to visualize a refractive index distribution caused by the temperature and concentration inhomogeneities. To visualize a convective flow structure and pattern formation process, the tracer particles method is used.…”

Section: Introductionmentioning

confidence: 99%

Experimental methods for visualization of hydrodynamic instability caused by the neutralization reaction in a miscible two-layer system

Mosheva

2019

EPJ Web Conf.

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This paper focuses on experimental investigations of the spatio-temporal distributions of fluid velocity and temperature and the concentration of reagents and reaction products. We study concentration-dependent diffusion (CDD) convection driven by the neutralization reaction in a two-layer miscible system in a vertical Hele-Shaw cell using the original experimental complex. A comprehensive understanding of the physical mechanisms of convective motion and instabilities requires employing various experimental methods simultaneously. The proposed experimental complex provides simultaneous visualization and facilitates identification of the location of the reaction front, which is of importance to the study of its characteristics.

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“…(Beeson-Jones and Woods 2015, Borcia and Bestehorn 2009, Chen and Liu 2005, Chen et al 2008, Hughes et al 2012, Pramanik and Mishra 2014, Pramanik and Mishra 2015 In both immiscible and miscible systems there are similar mechanisms present such as shielding and splitting of fingers which affect the way the pattern of the instability develops (Homsy 1987, Nagatsu et al 2007. A gravity field is not necessary for VF to occur; however, three-dimensional effects arising from layered density differences in the gravity field have been shown to modulate the flow in some cases (Bunton et al 2016, John et al 2013, Oliveira and Meiburg 2011. Numerous computational and experimental investigations have demonstrated variations in viscous fingering if the two fluids involved can chemically react thereby changing the viscosity profile at the interface.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of miscible viscous fingering by a step growth polymerization reaction

et al. 2018

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Fingering is a hydrodynamic instability that occurs when a more mobile fluid displaces a fluid of lower mobility. When the primary source of the mobility difference is viscosity, the instability is termed viscous fingering. Viscous fingering is often, though not always, undesirable in industrial processes, particularly secondary petroleum recovery. Linear stability analysis by Hejazi et al. has indicated that the production of a non-monotonic viscosity profile can stabilize the interface. Herein, we use step-growth polymerization at the interface between two miscible monomers as a model system. In particular a dithiol monomer displaced a diacrylate that reacted to form a linear polymer that behaves as a Newtonian fluid. Viscous fingering was imaged in a horizontal Hele-Shaw cell via Schlieren, which is sensitive to changes in index of refraction and therefore polymer conversion. By varying reaction rate via initiator concentration along with flow rate via a syringe pump, we were able to demonstrate increasing stabilization of the flow with increasing Damköhler number.

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Schlieren imaging of viscous fingering in a horizontal Hele-Shaw cell

Cited by 16 publications

References 31 publications

Influence of microscopic precipitate structures on macroscopic pattern formation in reactive flows in a confined geometry

Influence of microscopic precipitate structures on macroscopic pattern formation in reactive flows in a confined geometry

Experimental methods for visualization of hydrodynamic instability caused by the neutralization reaction in a miscible two-layer system

Stabilization of miscible viscous fingering by a step growth polymerization reaction

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