A Note on the Response Equations for Hot-Wire Anemometry

[+] Author and Article Information
M. K. Swaminathan, G. W. Rankin, K. Sridhar

Department of Mechanical Engineering and Fluid Dynamics Research Institute, University of Windsor, Windsor, Ontario, Canada N9B 3P4

J. Fluids Eng 108(1), 115-118 (Mar 01, 1986) (4 pages) doi:10.1115/1.3242529 History: Received March 26, 1984; Online October 26, 2009


The various heat transfer laws describing the response of the hot-wire to the velocity normal to its axis have been evaluated on a common basis to judge their effectiveness in representing the raw calibration data. The models compared were the King’s law, the exponent power-law, the extended power-law and the polynomial heat transfer law. These models were compared in the high and low velocity ranges of 0–100 m/s and 0–35 m/s, respectively. The criteria chosen for comparison were the minimum sum of the errors squared in the velocity and the estimated uncertainties in the calibration constants evaluated. The results indicate that the differences in the various models based on the sum of the errors in velocity, are not significant. However, when an uncertainty analysis for the constants are included in the study, the extended power-law proves to be robust in both the velocity ranges besides yielding a low error in the velocity. The fourth order polynomial law produces the lowest error in velocity, but the uncertainty in the constants evaluated are considerable. The nonlinear method of calibration together with the crierion of minimizing the errors in velocity offers no significant improvement in a statistical sense as compared to the linear method and the criterion of minimizing the errors in E2 .

Copyright © 1986 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In