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Showing 1 to 20 of 29 for “"viscous fingering"”.
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Controlling Viscous Fingering
Viscous fingering occurs when one fluid displaces another fluid of a greater viscosity in a porous medium or a Hele-Shaw cell. Linear stability analysis is used to predict methods of suppressing instability. Then, experiments in which nonlinear growth dominates pattern formation are analysed to …
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Viscous fingering instabilities and gravity currents.–—
… A well-known example of this occurs when a less viscous fluid displaces a more viscous immiscible fluid either in a porous medium or in a Hele-Shaw cell, which is commonly referred to as the Saffman–Taylor instability. There are three related problems studied in this thesis: a single-layer …
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Radial Miscible Viscous Fingering of Icelandic Mantle Plume
… dynamical phenomenon which occurs when a less viscous fluid is injected into a more viscous fluid. Mobility ratio (i.e. the ratio of fluid viscosities), Peclet number (i.e. the ratio of advective and diffusive transport rates) and thickness of the horizontal layer into which the fluid is …
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Numerical simulation of mixing in viscous-fingering displacements
Mixing of two fluids in viscously unstable displacements is far from being fully understood. It is not known how mixing efficiency depends on the viscosity contrast between the fluids, especially for advection-dominated flows (Peclet number Pe > 103). It is well known that when a less viscous fluid …
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Understanding the evolution of miscible viscous fingering patterns
Viscous fingering, the hydrodynamic instability that occurs when a lower viscosity fluid displaces a higher viscosity fluid, creates complex patterns in porous media flows. Fundamental facets of the displacement process, such as volumetric sweep and mixing efficiency, depend strongly on the type of …
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Simulation of viscous fingering during miscible displacement in nonuniform porous media
… In that case a gravity tongue forms and fingering is suppressed. The tongue breaks through early and recovery efficiency after breakthrough is greatly reduced. The effect of gravity weakens as the aspect ratio increases.
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Viscous Fingering Instability of Complex Fluids in a Radial Hele-Shaw Cell
When a less-viscous fluid displaces another fluid of higher viscosity in a porous medium, instability can develop at the interface between the two fluids. The instability manifests itself in the form of finger-like patterns of the displacing fluid propagating through the displaced one. In this …
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Mixing with complex patterns : from the impact of miscible viscous fingering to the effects of motile bacteria
… density, or viscosity are commonplace. Viscous fingering is a hydrodynamic instability that occurs when a less viscous fluid displaces a more viscous one. Instead of progressing as a uniform front, the displacing fluid forms fingers that vary in size and shape to form complex patterns. …
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Flow through porous media : from mixing of fluids to triggering of earthquakes
… flow and deformation. We show that miscible viscous fingering-the hydrodynamic instability that arises when a less viscous fluid displaces the more viscous one-can be employed as an agent for enhanced mixing in porous media flows. Based on results from high-resolution numerical simulations, …
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Transport-limited aggregation and dense granular flow
… such as diffusion-limited aggregation (DLA) and viscous fingering. The fractal properties, crossover in morphology, and relation between continuous and stochastic growth are studied in the context of a representative case, advection-diffusion-limited aggregation (ADLA). The model is extended on …
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Vertical Motions at the Fringes of the Icelandic Plume
… is proposed to be a manifestation of radial viscous fingering due to a Saffman-Taylor instability. This fluid dynamical phenomenon occurs when less viscous fluid is injected into a layer of more viscous fluid. By comparing the thermal and convective characteristics of the plume with …
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Numerical Approximation of Multiphase Flows in Heterogeneous Porous Media
… solutions, the quarter five-spot problem, and viscous fingering generation. The result is a robust convergent scheme achieving optimal levels of convergence to both small and large-scale problems. Furthermore, the scheme provides moderate to acceptable levels of improved computational …
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Flow and mixing in complex porous media
… In chapter 2, the dynamics of the miscible viscous-fingering instability are investigated. It is found that the dynamics can be divided into three regimes: at early times, the flow is well described by linear stability theory; at intermediate times, the flow is dominated by non-linear finger …
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Laboratory Investigation of Polymer-flooding, ASP-flooding, and Foam-flooding in Heavy Oil System
… achieve a very low oil recovery due to severe viscous fingering. Hence, research into other non-thermal recovery methods is necessary. This thesis presents a laboratory-scale investigation of heavy oil recovery by polymer flooding, ASP (alkali-Surfactant-Polymer) flooding and ASP-foam flooding. …
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Jamming transition and emergence of fracturing in wet granular media
… characterizes the crossover from capillary fingering to viscous fingering, and a transition from fingering to fracturing can be achieved either by decreasing frictional resistance. The balance between frictional, viscous, and capillary forces has been studied in experiments and simulations, …
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Using data analytics and laboratory experiments to advance the understanding of reservoir rock properties
… model demonstrated the development of viscous fingering when the injection water flow rate was higher than a certain level, which resulted in reduced overall sweep efficiency. These comprehensive laboratory experiments demonstrate the role of confining pressure, Klinkenberg effect, and …
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Development of an Immersed Boundary Method for the Simulation of Moving Bodies at Fluid-fluid Interfaces
… transition between stable displacement, viscous fingering and capillary fingering is demonstrated.
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Pattern formation in fluid injection into dense granular media
… grain displacement-dominated regime, and (iv) a viscous fingering-dominated regime. These distinct failure/flow regimes emerge as a result of competition among various energy dissipation mechanisms, namely, viscous dissipation through infiltration, dissipation due to grain displacements, and …
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Study on the gas performance of ceramic membrane from kaolin prepared by phase inversion technique
… for both parameter that can be correlated to the viscous fingering mechanism in the formation of ceramic membrane structure. A slightly similar results trends and pattern was demostrated with Type B kaolin and weakest coagulant (mixture of 70% NMP and 30% distilled water). Overall performance …
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Study on the gas performance of ceramic membrane from kaolin prepared by phase inversion technique
… for both parameter that can be correlated to the viscous fingering mechanism in the formation of ceramic membrane structure. A slightly similar results trends and pattern was demostrated with Type B kaolin and weakest coagulant (mixture of 70% NMP and 30% distilled water). Overall performance …
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