Presentation of an experimental approach for the determination of mean velocity in oscillating tube flows via hot wire anemometry

The utilization of constant temperature anemometry (CTA) system for the measurement of mean oscillating velocity of air at negligible compressibility is discussed in this paper. The measurements were conducted at a station of self-excited oscillations in a circular cross sectional pipe following the collapse of the elastic test tube of a Starling resistor in a flow Reynolds number range of 7,000 ? Re? 94,000. The cross-sectional traverse of the hot-wire probe at the measurement station in a frequency (f) range of 13Hz ?f ?107Hz were conducted. The cross sectional oscillating velocity profle was determined by using the ensembled averages of oscillating velocity data. The position of the hot-wire probe corresponding to the mean axial oscillating velocity was determined to be approximately 0.755 of pipe radius from the centreline in the covered ranges of Re and f.