Abstract
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.
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