Computer Science – Performance
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........48k&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF ILLINOIS AT URBANA -CHAMPAIGN, 1993.Source: Dissertation Abstracts International, Volume: 54-06,
Computer Science
Performance
Velocimetry
Scientific paper
A systematic study of the parameters which affect the measurement of velocity vector fields in fluid mechanics experiments using the particle image velocimetry procedure has been carried out for a range of alternative methods of PIV recording and analysis. The study has provided a number of criteria which are used to determine which experimental and interrogation parameters are most important for a range of fluid motions and a range of alternative methods of PIV recording and interrogation. In addition, it has been shown that velocity gradients within the flow field result in biased experimental measurements. The extent of the bias has been quantified and recommendations to minimize bias have been made. The original analysis of the double-pulse PIV has been generalized to multiple-pulse systems where multiple exposure are made on a single recording frame and interrogated by auto-correlation methods. With the generalization from photographic film to CCD arrays in mind, the performance of multiple-frame systems in which single images are recorded sequentially on each frame has been considered and compared with the performance of single-frame systems. The cross -correlation algorithms, which determine the image separation between successive single-exposure frames, have been compared with auto-correlation algorithms. A qualitative study of the velocity field and the temperature field has been carried out using flow visualization techniques in turbulent, non-penetrative, thermal convection over non-uniform surfaces, prior to implementation of PIV techniques to measure velocity vector fields. Use of encapsulated thermochromic crystals enabled temperature fields to be visualized during quasi-steady non-penetrative thermal connection, in vertical planes parallel to the roughness axis and in horizontal planes just above the lower surface. From the flow visualization of fluid flow in vertical planes parallel to the roughness axis, the effect of surface roughness upon the coherent structures near the lower surface has been examined. In addition, the effect of surface roughness on the size and orientation of the cells of downflow near the lower surface has been studied by visualization of horizontal planes just above the lower surface. Further flow visualization is planned to study the coherent structures at higher elevations above the lower surfaces prior to an investigation using PIV. (Abstract shortened by UMI.).
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