Revisiting end conduction effects in constant temperature hot-wire anemometry

Abstract

Abstract: The effect of end conduction losses in constant temperature hot-wire anemometry is studied theoretically and experimentally. A perturbation analysis is employed to determine the dynamic response of a hot-wire together with its constant temperature anemometer (CTA), with unetched portions of the wire (stubs) and prongs taken into account. Results of the model reveal that when the end conduction losses are significant, dynamic sensitivity of the hot-wire-CTA system can be either more or less than the static sensitivity based on the specifications of the hot-wire probe and the CTA. This means that contrary to the commonly accepted scenario, a hot-wire with insufficient length-to-diame..