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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Time-resolved heat flux measurements of the turbulent junction vortex system

Swisher, Stacey Elaine 31 October 2009 (has links)
A rapid-response thin-film heat flux sensor was used to measure time-resolved 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 the velocity unsteadiness. The study of this three-dimensional vortex system through time-resolved heat flux measurements is unique; as far as the author is aware, no previously published work has demonstrated the correlation between flow unsteadiness and its effects on the heat transfer for this phenomenon. The heat flux unsteadiness indicative of this vortex flow is discussed as turbulence coefficients and is calculated from both time-resolved and frequency measurements. Turbulence levels as high as 30% were recorded from the time-resolved data and were substantiated by the averaged power spectrum data. The development of the vortex system itself causes three times the heat transfer of the undisturbed boundary layer. / Master of Science
2

Unsteady pressure and vorticity fields in blade-vortex interactions

Pesce, Matthew M. 12 March 2009 (has links)
The unsteady interaction of a vortex core with a NACA 0015 airfoil is studied in two dimensions. A two-component, three-beam Helium-Neon laser-Doppler Velocimetry system is used to take data in a water tunnel. Ensemble-averaged velocity fields are obtained in the region of the leading edge of the airfoil. Finite-difference algorithms were written to obtain vorticity and pressure in the data field. Computer animation of the unsteady vorticity was accomplished first with a Fortran code written for an Apple Macintosh computer and later with a commercial software package for a SUN Microsystems graphics terminal. / Master of Science

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