A micro-hot-wire anemometry probe with elongated stubs for turbulent boundary layer measurements
Résumé
The development of micro-hot-wire anemometry probes for turbulence studies requires mitigating spatial filtering, end-conduction effects and probe intrusivity. Keeping these factors in mind, this work analytically and experimentally investigates the relevance of a micro-hot-wire probe design featuring elongated stubs, inspired by Wollaston-wire probes but fabricated using modern micro-fabrication techniques. The resulting probes are shown to be relatively easy to manufacture and capable of providing satisfactory velocity measurements in a zero-pressure-gradient turbulent boundary layer at Reτ≈1150. Different probes were tested, all featuring a micro-wire length sufficiently small to alleviate spatial filtering of near-wall small-scale turbulent structures. The investigation focuses on assessing end-conduction effects and probe intrusivity, with the latter still observable close to the wall for such micro-probes.
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A comme version hal-04648653 Article Baptiste Baradel, Alain Giani, Fabien Méry, Philippe Combette, Olivier Léon. A micro-hot-wire anemometry probe with elongated stubs for turbulent boundary layer measurements. Experiments in Fluids, 2024, 65 (9), pp.133. ⟨10.21203/rs.3.rs-4109150/v1⟩. ⟨hal-04648653v2⟩