Effect of fluid temperature on hot-wire anemometers and an improved method of temperature compensation and linearisation without use of small signal sensitivities

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Abstract
Theoretical considerations and experimental results indicate that except for a very slight temperature effect on fluid properties, the square of the hot-wire anemometer voltage is, within normal experimental accuracy, linearly dependent on the fluid temperature when operating in the constant wire temperature mode. This permits use of a greatly simplified calibration procedure. When used with the three-term velocity calibration, a simple analogue circuit is available to give a temperature compensated and fully linearised instantaneous velocity signal. The method is suitable for measurements in heated flows as well as in isothermal ones where the fluid temperature may differ from that at which the calibration was performed.
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