Publication:
The development and structural characteristics of Dean vortices in a curved rectangular channel

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Authors
Baun, Lawrence Richard
Subjects
Dean vortices
Dean number
Rectangular Curved Channel
Advisors
Ligrani, P. M.
Date of Issue
1988-09
Date
Publisher
Language
en_US
Abstract
The development and structure of Dean vortices in a curved channel were measured and studied. A 40:1 aspect ratio channel with mild curvature was employed. Circulation of mean streamwise vorticity, and maxima of streamwise, spanwise and radial components of vorticity increase as the Dean number increases from 40 to 140. Mean vorticity components were determined from measurements of the three components of mean velocity using a miniature five hole pressure probe. Spectra obtained from a subminiature crossed-wire probe show principal and harmonic frequencies for Dean numbers greater than 165, when vorticies are twisting. Spectral peaks at other Dean numbers provide evidence of oscillations also observed during flow visualization.
Type
Thesis
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Format
221 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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