Abstract
The design and manufacture of a thin-film probe suitable for measuring the magnitude of wall shear stress in three-dimensional flow are described in detail. The probe has been calibrated in a closed rectangular channel using water as the medium. The calibration is linear and repeatable over the wide range of shear stress covered by experiment, and the variation in the probe output is no greater than 0.25% over the 360 degrees rotation of the probe. It is suitable for instantaneous measurements at frequencies of up to at least 10 Hz. Measurements of wall shear stress made in a semi-cylindrical hollow mounted transverse to the main flow are described. These correlate extremely well with similar measurements of shear stress using an electrochemical technique and with the results of a numerical study, thus indicating the suitability of this probe for such measurements.
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