A wall layer correction for ultrasound measurement in tube flow: comparison between theory and experiment

The ultrasound pulse Doppler (UPD) technique is used to measure velocity profiles non-intrusively. Large deviations from the expected profiles are found near the tube wall, because of the finite size of the measuring volume. Parts of the ideal measuring volume of the UPD method protrude into the flu...

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Bibliographic Details
Published in:Flow measurement and instrumentation 2000-06, Vol.11 (2), p.63-69
Main Authors: Wunderlich, Th, Brunn, P.O.
Format: Article
Language:English
Subjects:
Adjustment of ultrasonic data
Doppler effect
Flow field
Laminar flow
Measuring volume
Nondestructive examination
Pipe flow
Time windows
Tube wall
Ultrasonic measurement
Ultrasound-pulse-Doppler method
Velocity profile
Volume measurement
Wall flow
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Summary:The ultrasound pulse Doppler (UPD) technique is used to measure velocity profiles non-intrusively. Large deviations from the expected profiles are found near the tube wall, because of the finite size of the measuring volume. Parts of the ideal measuring volume of the UPD method protrude into the fluid close to the wall. To account for this theoretically, formulae based on the geometry of the situation are derived. Applied to the experimental data, agreement of a measured velocity distribution in laminar tube flow is reached with its theoretical prediction up to distances from the wall of one wavelength of the ultrasound.
ISSN:0955-5986
1873-6998
DOI:10.1016/S0955-5986(00)00011-X