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 43 for “"vortex flow"”.
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Underdamped vortex flow devices
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Discrete superconducting vortex flow transistors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Analysis for Taylor vortex flow
Taylor vortex flow is one of the basic problems of nonlinear hydrodynamic stability. In contrast with the wide region of wavenumber predicted by the linear theory, experiments show that Taylor vortex flow only appears in a small region containing the critical wavenumber ß<sub>er</sub> This …
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Vortex flow around the bases of obstacles
… and theoretical investigations of the horseshoe vortex systems caused by boundary layer separation upstream of obstacles mounted on a wall. Flow visualization enabled these vortex systems to be described in detail for both laminar and turbulent flow upstream of the obstacles, for flow velocities …
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Characterization of a Taylor-Couette vortex flow reactor
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1994.
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Geometry modification effects on a junction vortex flow
… on some properties of time-resolved flow measurements on the upstream symmetry plane of a junction vortex region were studied. A single linearized hot-wire was used to characterize the spatial distribution of the fluctuating flow turbulent kinetic energy. The distribution was …
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The Behavior Of A Macroscopic Granular Material In Vortex Flow
… granular materials under tornado-like vortex airflow, with varying airflow velocity, was observed and studied. The experimental system was composed of a 9.20-cm inner diameter acrylic pipe with a metal mesh bottom holding the particles, a PVC duct, and an airflow source controlled by a …
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A secondary flow approach to the inlet vortex flow field
… is presented of the fluid mechanics of the inlet vortex (or ground vortex) phenomenon. The vorticity field associated with the vortex is investigated using a secondary flow approach. In this approach the flow is assumed to be composed of an irrotational primary flow and a weak shear flow, with the …
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Measurement of three-dimensional horseshoe vortex flow in a duct
… presents measurements of the three-dimensional flow due to the horseshoe vortex formed at the junction of a flat wall and the leading edge of a Rankine half body. The half body is located between the parallel end walls of a duct to model the situation in turbomachinery where struts and vanes, …
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A three-dimensional turbulent boundary layer upstream and around a junction vortex flow
… three-dimensional turbulent boundary layer flow upstream and around a junction vortex was experimentally studied and is offered for use as a benchmark flow for testing and evaluating the predictive ability of state-of-the-art three-dimensional turbulent boundary layer codes. The …
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Characterization and application of vortex flow adsorption for simplification of biochemical product downstream processing
… operation, thereby tightening the whole process. Vortex flow occurs in the annular gap between an inner rotating solid cylinder and an outer stationary cylindrical shell. Above a critical rotation rate, circular Couette flow bifurcates to a series of counter-rotating toroidal vortices. By …
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An investigation of the effect of a tangential gas velocity on combustion instability.
… rocket motor was built to study the effects of a vortex flow on combustion instability. Normal heptane and air were used as propellants with the air being divided into two flows; a primary flow at the center of the combustion chamber and a secondary flow at the periphery of the chamber. The …
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Time-resolved heat flux measurements of the turbulent junction vortex system
… unsteady heat flux in a complex junction vortex flow. This sensor, called the Heat Flux Microsensor, was used with a hot-wire anemometer to make simultaneous measurements of velocity and surface heat flux. The results were used to detect the relationship between the surface heat flux and …
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Analysis of the vortical flow around a 60 degree delta wing with vortex flap
… flat plate, delta wing with a leading edge vortex flap. The pressure distributions were measured over a range of angles of attack starting from zero to 40° in 5° interval and flap deflection angles from zero to 45° with 5° increments at a Reynolds number of about 2.14 x 10‘ based on the root …
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Analysis of vortex shedding in a various body shapes
… shape of bluff body that can be used for vortex flow meter applications. Numerical simulations of bluff body shapes such as circular, rectangular and equilateral triangular have been carried out to understand the phenomenon of vortex shedding. The simulation applied
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An analytical study of a confined viscous vortex
"A composite solution for the flow field of a three dimensional, incompressible laminar, viscous vortex confined inside a conical converging nozzle is presented. This model is used to study the strong mainstream boundary layer interaction that occurs in confined vortex flows. The confined vortex …
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Experimental Measurements of Vortex Breakdown with non-Isothermal Inflow
Vortex breakdown occurs in many flow applications such as weather, aerodynamics, swirl combustors, and more, introducing unsteadiness that is often undesired. While vortex breakdown has been previously investigated extensively, researchers have struggled to efficiently characterize these flows due …
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Spectral estimates and flow characteristics from non-uniformly sampled LDV data in a turbulent junction vortex
The strongly time variant flow in an incompressible, turbulent junction vortex formed at the base of a streamlined cylinder with a circular leading edge placed normal to a flat surface was investigated. The investigation centered around spectral analysis and time resolved measurements of the …
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Laser Doppler velocimeter measurements in a turbulent junction vortex
… of an incompressible, turbulent junction vortex formed at the base of a streamlined cylinder with a circular leading edge placed normal to a flat surface is documented. The flow environment is characterized by a body Reynolds number of 183,000, based on the diameter of the model. The …
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