Frequency response and instantaneous temperature profile of coldwire sensors for fluid temperature fluctuation measurements
Abstract
The information of the wire response is necessary for the estimation of corrections and uncertainty of temperature measurements. This paper describes the theoretical response of coldwire sensors to temperature fluctuations in a fluid flow. Existing transfer functions of cold wires are approximate and implicit functions of frequency. We present the exact solutions of heat conduction equations for a cold wire and stubs taking account of the prong effect. Because the solutions have simple forms of elementary functions, we can easily calculate the frequency response of cold wires. Sample calculations are given under several typical conditions. Also, the instantaneous temperature profiles of a cold wire are obtained for the first time.
 Publication:

Experiments in Fluids
 Pub Date:
 June 1992
 DOI:
 10.1007/BF00218164
 Bibcode:
 1992ExFl...13..171T
 Keywords:

 Flow Measurement;
 Flowmeters;
 Frequency Response;
 Temperature Profiles;
 Thermal Conductivity;
 Flow Equations;
 Heat Transfer Coefficients;
 Thermal Diffusivity;
 Transfer Functions;
 Instrumentation and Photography