A new technique for interpretation of hot-film anemometer sensor response is described. This technique has been applied to simultaneous measurement of profiles of mean velocity, the three components of velocity vector fluctuation, and temperature fluctuation in non-isothermal pipe flow of water using multiple sensors. Sensors operated in the constant temperature mode (CTA) respond to both mean and fluctuating velocity and temperature. The influence of mean temperature gradient on CTA sensor response was eliminated by appropriate adjustment of the sensors' operating resistances as the temperature gradient was traversed. The adjustments were derived from analysis of linearized CTA sensor response. A sensor operated as a resistance thermometer (CCA) responded to the mean temperature and temperature fluctuations and had negligible velocity response. Estimates of errors in the interpretation of responses are presented. Errors depend on the magnitude of the mean temperature gradient, sensors' coefficients of resistivity, and obedience to known cooling and yaw-sensitivity laws. Calculations are presented for uncoated 2-mil and 6-mil hot-film sensors. Examples of the application of this technique to the measurement of turbulence in water are presented.

Meeting Name

Symposium on Turbulence in Liquids (1971: Oct. 4-6, Rolla, MO)


Chemical and Biochemical Engineering

Document Type

Article - Conference proceedings

Presentation Type

Contributed Paper


New Measurement Techniques

Document Version

Final Version

File Type





© 1972 University of Missouri--Rolla, All rights reserved.