Global ETD Search
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 1009 for “"Instabilities"”.
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Electromechanical streaming instabilities
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1965.
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Instabilities of rotating jets
When a jet of water is in free fall, it rapidly breaks up into drops, since a cylinder of water is unstable. This and other problems involving the form of a volume of water bound by surface tension have yielded a wealth of theoretical and experimental results, and given insight into such phenomena …
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Studies on secondary instabilities
… flows have been achieved by studying secondary instabilities in selected prototype flows. These secondary instabilities can be modeled as parametric instabilities of the nearly periodic flow that consists of the prototype velocity profile and a superposed finite-amplitude TS-wave (wavelength λ). …
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Shape formation via elastic instabilities
… more complicated shape. Traditionally, elastic instabilities, such as buckling and wrinkling, have been studied as failure modes in stiff material systems. However, soft highly deformable solids, such as rubbers and biological tissues, can undergo instabilities without failure, offering the …
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Instabilities in asymptotically AdS spacetimes
In recent years, more and more efforts have been expended on the study of $n$-dimensional asymptotically anti-de Sitter spacetimes $(\mathcal{M},g)$ as solutions to the Einstein vacuum equations \begin{align*} \mathrm{Ric}(g)=\frac{2}{n-2}\Lambda\, g \end{align*} with negative cosmological constant …
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Surfactant instabilities on thin films
The deposition of a surfactant drop 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, …
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Magnetohydrodynamic instabilities in liquid mercury
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1961.
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Diffusional instabilities on curved manifolds
Diffusionally-driven instabilities provide a versatile mechanism for pattern formation, and have found applications in modeling a variety of biological and chemical systems. Although pattern formation has been observed in systems with a variety of geometries, the theoretical study of diffusional …
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Instabilities in particle-laden flows
… broad range of problems in terms of rheology and instabilities. In both cases, new phenomena are continually discovered. Indeed, complex behavior can be exhibited whether the granular media acts like a solid, a liquid or a gas. Moreover, the flow of thin liquid films on solid surfaces is a …
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Secondary instabilities of boundary layers
Several aspects of the subharmonic instability of boundary layers are studied. First, the subharmonic instability of incompressible flows over a flat plate is investigated using the resonant triad model and the Floquet model. The primary wave is taken in the form of a two-dimensional (2-0) …
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Shear flow instabilities in stratified magnetohydrodynamics
… to turbulence of fluid flow. Shear flow instabilities of electrically-conducting fluids play a critical role in the dynamics of astrophysical objects, such as planets, stars, accretion disks and galaxies. An important motivating example is the thin stably-stratified region in the Sun …
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Instabilities in smectic A liquid crystals
In this thesis, the behaviour and stability of smectic A and smectic C liquid crystals are considered under the application of external influences. The behaviour of smectic A liquid crystals under oscillatory shear will be modelled using dynamic continuum theory recently developed by Stewart …
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Instabilities of volatile films and drops
We report on instabilities during spreading of volatile liquids, with emphasis on the novel instability observed when isopropyl alcohol (IPA) is deposited on a monocrystalline silicon (Si) wafer. This instability is characterized by emission of drops ahead of the expanding front, with each drop …
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Flow Instabilities in Flute-like Instruments
… lay out a framework to continue investigating instabilities in flute-like instruments.
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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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Functional kirigami by exploiting elastic instabilities
… through reversible and controllable elastic instabilities. Among various types of structures designed for mechanical metamaterials exploiting elastic instabilities, architectures inspired by a paper cutting technique, kirigami, attracted tremendous attention due to its robust and …
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Gravitational Instabilities in a Rotating Fluid
Made available in DSpace on 2014-12-13T18:55:31Z (GMT). No. of bitstreams: 1 7606984.pdf: 6669099 bytes, checksum: db28e57760a633e72e70911875a7fae2 (MD5) Previous issue date: 1975
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Dynamical instabilities in disc-planet interactions
… the role of disc self-gravity on the vortex instabilities. It can be shown that self-gravity has a stabilising effect. Linear numerical calculations confirms this. When applied to disc-planet systems, modes with small azimuthal wavelengths are preferred with increasing disc selfgravity. This …
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Shear flow instabilities in viscoelastic fluids
… flows at large Weissenberg number where the instabilities are due to discontinuities in the elastic properties, and part II studies the effect of elasticity on the well-known inertial instabilities of inviscid flows with inflection points. We begin part I with a previously known short-wave …
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Instabilities and transport in magnetized plasmas
… the system. In this thesis we examine two such instabilities and, where appropriate, their effects on transport. First we consider the collisional (fluid) magnetized magnetorotational instability (MRI) in the presence of the Braginskii viscosity. We conduct a global linear analysis of the …
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