Sökning: "vortex"

Visar resultat 1 - 5 av 236 avhandlingar innehållade ordet vortex.

  1. 1. Vortex Properties from Resistive Transport Measurements on Extreme Type-II Superconductors

    Författare :Andreas Rydh; KTH; []
    Nyckelord :superconductivity; vortex; phase transition; YBa2Cu3O7-d; vortex dynamics; critical current; single crystal; oxygen deficiency; anisotropy; vortex glass; vortex lattice; melting; vortex liquid; vortex correlation; disorder; Lorentz force;

    Sammanfattning : .... LÄS MER

  2. 2. Wind turbine wakes : controland vortex shedding

    Författare :Davide Medici; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind Energy; Power Optimisation; Active Control; Yaw; Vortex; Mechanical energy engineering; Mekanisk energiteknik;

    Sammanfattning : Wind tunnel studies of the wake behind a model wind turbine have been made in order to get a better understanding of wake development as well as the possibility to predict the power output from downstream turbines working in the wake of an upstream one. Both two-component hot-wire anemometry as well as particle image velocimetry (PIV) have been used to map the flow field. LÄS MER

  3. 3. Vortex fluctuations in superconductors

    Författare :Peter Olsson; Umeå universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Superconductor; Two dimensions; vortex; coulomb gas; XY model; Kosterlitz-Thouless transition; high-Tc.;

    Sammanfattning : The vortex fluctuations have proved to be responsible for the onset of dissipation in thin type-II superconducting Aims. There is also growing evidence that dissipation in high- temperature superconductors exhibits the same kind of two-dimensional (2D) behavior. LÄS MER

  4. 4. Analytical vortex solutions to Navier-Stokes equation

    Författare :Henrik Tryggeson; Mats Lyberg; Maarten Brons; Växjö universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; conical vortex; Navier-Stokes equation; analytical solution; 2-D vortices; turbulence; vortex ring; stretched vortex; coherent structures; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : Fluid dynamics considers the physics of liquids and gases. This is a branch of classical physics and is totally based on Newton's laws of motion. Nevertheless, the equation of fluid motion, Navier-Stokes equation, becomes very complicated to solve even for very simple configurations. LÄS MER

  5. 5. On the three-dimensionality of vortex shedding from a circular cylinder

    Författare :Stefan Szepessy; Chalmers University of Technology; []
    Nyckelord :vortex wake; three-dimensional effects; spanwise correlation; Strouhal number; circular cylinder; fluid dynamics; bluff body; vortex shedding; Kármán vortex street; end plates;

    Sammanfattning : .... LÄS MER