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Flow regimes and pressure histories during blowdown from a vertical tube Steeves, Alan
Abstract
A series of blowdown experiments have been performed while discharging either vertically (upwards or downwards) or horizontally in order to compare the effect of body force on transient flow patterns and pressure histories. Tests were done using Freon-114 in a clear polycarbonate pipe 4 m long with a 32 mm I.D. Results, presented in the form of flow regime maps, show that the basic nature of the developing flow in a vertical pipe when discharging upward is different than for the downward discharge case. Both cases are in turn markedly different than for horizontal discharge. Pressure histories were found to fall into two categories: one in which the pressure fell rapidly to near the saturation pressure, then slowly to atmospheric; a second in which transient repressurization to nearly the initial pressure was observed following the initial pressure drop. The second category occurred only in the vertical pipe and could not be satisfactorily explained. Rapid changes in axial pressure gradient, and possible flow reversal, were noted in the repressurization case.
Item Metadata
Title |
Flow regimes and pressure histories during blowdown from a vertical tube
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1983
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Description |
A series of blowdown experiments have been performed while discharging either vertically (upwards or downwards) or horizontally in order to compare the effect of body force on transient flow patterns and pressure histories. Tests were done using Freon-114 in a clear polycarbonate pipe 4 m long with a 32 mm I.D. Results, presented in the form of flow regime maps, show that the basic nature of the developing flow in a vertical pipe when discharging upward is different than for the downward discharge case. Both cases are in turn markedly different than for horizontal discharge. Pressure histories were found to fall into two categories: one in which the pressure fell rapidly to near the saturation pressure, then slowly to atmospheric; a second in which transient repressurization to nearly the initial pressure was observed following the initial pressure drop. The second category occurred only in the vertical pipe and could not be satisfactorily explained. Rapid changes in axial pressure gradient, and possible flow reversal, were noted in the repressurization case.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-04-22
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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 |
10.14288/1.0095776
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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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Item Media
Item Citations and Data
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.