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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 50 for “"Couette Flow"”.
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Helical magnetorotational instability in MHD Taylor-Couette flow
… 1959, in a very different context. Theoretical flow of a conducting liquid confined between differentially rotating cylinders in the presence of an external magnetic field was analyzed. The central conclusion is that the additional magnetic field parallel to the axis of rotation can destabilize …
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Formation of Taylor vortices in spherical Couette flow
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, 1984
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Apparatus for spherical Taylor-Couette flow with induced thermal convection
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Instability and mixing in a turbulent stratified Taylor-Couette Flow
… in a stably stratified turbulent Taylor-Couette flow, which is the flow in the annular region of two co-axial cylinders, both capable of rotating at different speeds independently, in the presence of vertical stable stratification. Oglethorpe (2014) found that, for an initially linearly …
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A dynamical-systems approach to understanding turbulence in plane Couette flow
… the theory to understanding turbulent fluid flows, which could be thought of as spatio-temporal chaos in a very-high dimensional space. The theory explains a system's dynamics in terms of the local dynamics of its periodic solutions; these are the periodic orbits in state space. We considered …
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Couette flow measurement of equilibrium and energization charging in transformer insulation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
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Effect of self-stratification of sediment suspensions in turbulent plane Couette flow
… the formation and breakup of lutoclines in tidal flows. Sediment delivered by rivers into sea spread on the continental shelves, and are resuspended by waves or tidal currents. The sediment concentration near the bottom can be enhanced to a fairly high level, and a sharp concentration gradient …
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Rheological properties, stochastic characteristics, and second law violations of atomic fluids in Couette flow
… theories adapted to atomic fluids such as flow stability. Building on these models, we aim to understand the transitions to turbulence and flow instability in atomic fluids. Via the Poincaré inequality, we generalize a classical continuum methodology to atomic fluids and obtain a fluid …
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Exploring global dynamics in a low order model of parallel shear flow
The study of the onset of turbulence in the flow of fluids, which are governed by the Navier-Stokes equations, has produced some famous instabilities e.g. Kelvin Helmholtz instability. An important, and as of yet mysterious, flow is Plane Couette flow in which turbulence is observable. Another …
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Generalised nonlinear stability of stratified shear flows: adjoint-based optimisation, Koopman modes, and reduced models
… nonlinear stability of density stratified plane Couette flow. I begin by describing the history of transient growth phenomena, and in particular the recent application of adjoint based optimisation to find nonlinear optimal perturbations and associated minimal seeds for turbulence, the smallest …
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Nonlinear and non-modal stability of structures evolving in shear flows
… that develop in various constant density flows. In particular, the stability of nonlinear structures which develop in rotating plane Couette flow is analyzed using Floquet theory, which allows the global stability of an important secondary nonlinear structure called a Taylor vortex to be …
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UV Disinfection between Concentric Cylinders
… When the two concentric cylinders are fixed, the flow pattern in the gap can be laminar Poiseuille flow or turbulent flow depending on flow rates. If the inner cylinder is rotating, and the rotating speed of the inner cylinder exceeds a certain value, the flow pattern can be either laminar or …
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Modeling and Simulation of Molecular Couette Flows and Related Flows
<p>In this thesis, molecular Couette flow is clearly defined and the modeling and simulation of this kind of flow is systematically investigated. First, the integral equations for the velocity of gaseous Couette flow and related flows are derived from linearized Boltzmann BGK equation with Maxwell …
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The Diffuse Bounce Back Lattice Boltzmann Method and its Applications on the Study of Fluid-Particle Interactions
… has been preferred for simulating particulate flows due to its advantages of easy implementation, micro- and mesoscopic physical insights and parallel algorithm. Both sharp and diffuse boundary treatments are studied to recover curved and moving boundaries on structured orthogonal grids for the …
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Flow Between a Cylinder and a Rotating Coaxial Cylinder, Axisymmetric Shaft With Axially-Periodic Radius Variation, or Screw
"Flow between a circular cylinder and an inner shaft driven by an axial pressure gradient or boundary rotation is considered computationally. In spiral Poiseuille flow (SPF), where the inner shaft is a circular cylinder, complete linear stability boundaries are determined for a wide range of …
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CFD Study of Taylor-Like Vortices in Swirling Flows
<p>Swirling flows are complex fluid motions that appear in various natural phenomena and man-made devices. Numerous engineering applications such as turbomachinery, jet engine combustion chambers, mixing tanks and industrial burners involve swirling flows. This wide range of applications is due to …
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Direct measurement of skin friction on magnetically levitated vehicles
… device was used to measure the small tangential flow shear force that passes over the non-intrusive floating element. Piezoresistive strain gage units measure the relatively small strain that is generated by the wall shear. By adapting the geometry of the sensing unit, this design can be adapted …
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An Approximation for the Twenty-One-Moment Maximum-Entropy Model of Rarefied Gas Dynamics
… to predict continuum and moderately rarefied flow offers many modelling and numerical advantages over traditional methods. The maximum-entropy family of moment closures offers models described by hyperbolic systems of balance laws. In particular, the twenty-one moment model of the …
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Electromechanics and electrorheology of fluid flow with internal micro-particle electrorotation
… electrorheological responses of two dimensional Couette and Poiseuille flows with internal micro-particle electrorotation are modeled and analyzed via a set of "fully continuum mechanical modeling field equations" formulated in this thesis. By combining the theories of particle electromechanics …
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