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Calibration of a Wall-Shear-Stress Sensor Made of a Flush-Mounted Hot-Wire Over a Shallow Rectangular Slot

[+] Author Affiliations
James I. Medvescek, Samer Afara, Laurent B. Mydlarski, Bantwal R. (Rabi) Baliga

McGill University, Montreal, QC, Canada

Paper No. IMECE2014-39127, pp. V007T09A097; 8 pages
doi:10.1115/IMECE2014-39127
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering Systems and Technologies
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4954-5
  • Copyright © 2014 by ASME

abstract

The design, construction, and calibration of a wall-shear-stress sensor (WSSS) made of a flush-mounted hot-wire over a shallow rectangular slot are described. The rectangular slot beneath the hot-wire reduces the heat loss to the substrate and enhances the frequency response of the WSSS. The WSSS was connected to a constant-temperature anemometer (CTA) and calibrated by making measurements in fully developed flows of air in a parallel-plate channel, at three different channel heights. Initially, the square of the time-averaged voltage supplied to the hot-wire by the CTA was plotted against the time-averaged wall-shear-stress. With this practice, however, for a fixed value of the overheat ratio, even relatively small fluctuations of the ambient air temperature produced a fair amount of scatter in the calibration data, and this adverse effect was compounded by minor drifts in the electrical resistance of the hot-wire (unheated value) over the course of the measurements. For overcoming this difficulty, an alternative practice for correlating the calibration data was proposed and successfully implemented. The details of this WSSS, the proposed novel calibration practice for the WSSS, and related results are presented and discussed in this paper.

Copyright © 2014 by ASME

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