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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 73 for “"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.–—
This thesis examines the possible instability of radially spreading interfaces to the formation of fingers that break the axial symmetry. 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 …
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SELECTING FINGERING FOR PERFORMING MOZART’S PIANO MUSIC
… due to many factors. In order to understand how fingering selection can serve a composer’s musical intention, this paper concentrates on the study of historical treatises and performance practice, the development of the aesthetic of music, the development of the keyboard instrument, and the …
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Radial Miscible Viscous Fingering of Icelandic Mantle Plume
The Icelandic plume, a major convective upwelling, has had a considerable influence on the geological evolution of the North Atlantic region. Direct manifestations of this major convective upwelling include positive residual depth anomalies and long wavelength free-air gravity anomalies, both of …
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Numerical simulation of mixing in viscous-fingering displacements
… to the formation of a pattern known as viscous fingering. However, current simulation technology is unable to cope with large viscosity contrasts (M > 30). We develop a high-resolution simulation approach that is stable for arbitrary viscosity ratios, and we study mixing under different …
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Centrifuge modeling of immiscible fingering in porous media
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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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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Principles of bowing and fingering for editing violin music
… ideas and combinations of bowings and fingerings ultimately bring performances of compositions closest to his conception of them.Although numerous volumes have been written on performance techniques for violin, they usually do not address matters specifically related to deciding bowings …
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The Spohr fingering principles as manifested in his Violinschule
… published work. This thesis determines the fingering principles implicit in Louis Spohr’s treatise that would manifest themselves in a violinist if his Violinschule were applied as a tutor. The opening chapter briefly summarises the development of violin fingering and the external factors …
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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
… through the displaced one. In this work, viscous fingering instabilities involving complex fluids in a radial Hele-Shaw is investigated. Many fluids in our lives such as shaving foams, glues, flour-water dough, mayonnaise, and paints are complex fluids which exhibit multiple non-Newtonian …
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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. The …
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The Emergence of a Pivotal Role for the Thumb in Keyboard Fingering During the Early Eighteenth Century and Its Subsequent Impact on Pianistic Idiom
… the underlying changes in the approach to fingering of keyboard music (mainly harpsichord and piano) between the late 1500s and the mid-nineteenth century. The main focus of the work centers around the years c.1700-1775, as fingered sources and treatises of that time establish it to be a …
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Surfactant instabilities on thin films
… over a thin liquid film may be accompanied by a fingering instability. In this work, we present experimental results which identify the critical parameters that govern the shape and extend of the fingering phenomena. It was found that the normalized wavelength, [lambda]/t, scales with Marangoni …
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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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Flow and mixing in complex porous media
… 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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Templated Solid-State Dewetting of Single Crystal Ni Thin Films
… on a specific dewetting phenomenon called a fingering instability. The conditions that lead to fingering instead of an alternative phenomenon called rim pinch-off were investigated. It was found that an initial edge roughness leads to the development of fingering and that fingering can be …
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Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems
… a powerful control on the degree of viscous fingering in a gas-liquid system, whereby fluid dissolution hinders fingering while fluid exsolution enhances fingering. We employ this theoretical phase-field modeling approach to explain observations of bubble expansion coupled with gas …
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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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