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Effect of drag-reducing additives on pipe flow : Visualization with laser holographic interferometry Achia, B. Umesh
Abstract
The effect of turbulence damping polymer additive on the fluid flow structure near the wall region of a circular pipe was made visible using real-time laser holographic interferometry. The interference fringes were recorded by high-speed motion photography. The gross flow behaviour of dilute solutions of Polyox WSR 301 in distilled water was studied in a 2.63 cm pipe. It was observed that (i) The onset of drag reduction occurred at a critical value of wall shear stress and Reynolds number. (ii) The fluid property parameter, δ, which governs the drag reduction capacity of the solution, had a power-law dependence on polymer concentration given by [23] [ Formula omitted ] Motion pictures of real-time holographic fringe displays for pure solvent and polymer solution were appraised qualitatively. Under similar flow conditions turbulent eddies in drag-reducing flow were observed (i) to show less small scale structure than those in the pure solvent, and (ii) to burst from the wall region into the bulk flow with a lower frequency.
Item Metadata
Title |
Effect of drag-reducing additives on pipe flow : Visualization with laser holographic interferometry
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1971
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Description |
The effect of turbulence damping polymer additive on the fluid flow structure near the wall region of a circular pipe was made visible using real-time laser holographic interferometry. The interference fringes were recorded by high-speed motion photography.
The gross flow behaviour of dilute solutions of Polyox WSR 301 in distilled water was studied in a 2.63 cm pipe. It was observed that
(i) The onset of drag reduction occurred at a critical value of wall shear stress and Reynolds number.
(ii) The fluid property parameter, δ, which governs the drag reduction capacity of the solution, had a power-law dependence on polymer concentration given by [23]
[ Formula omitted ]
Motion pictures of real-time holographic fringe displays for pure solvent and polymer solution were appraised qualitatively. Under similar flow conditions turbulent eddies in drag-reducing flow were observed
(i) to show less small scale structure than those in the pure solvent, and
(ii) to burst from the wall region into the bulk flow with a lower frequency.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-04-05
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0059135
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.