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Nano-shaped hot-wire for ultra-high resolution anemometry in cryogenic helium

Abstract : We present the principle, modelling, and the first implementation of a new type of high resolution hot-wire anemometer designed to operate at cryogenic temperatures and very high Reynolds numbers. Its spatial resolution of a few micrometers is comparable to the most spatially-resolved hot-wires reported in the literature. Compared to existing designs, its fabrication involves a limited number of steps, essentially the shaping at nanoscales of a superconducting NbTi wire of sub-micron diameter. The velocity spectra in the far wake of a centimeter-sized grid is measured as a proof of concept in stringent flow conditions.
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Submitted on : Tuesday, October 15, 2019 - 6:26:00 PM
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Pantxo Diribarne, Pierre Thibault, Philippe-Emmanuel Roche. Nano-shaped hot-wire for ultra-high resolution anemometry in cryogenic helium. Review of Scientific Instruments, American Institute of Physics, 2019, 90 (10), pp.105004. ⟨10.1063/1.5116852⟩. ⟨cea-02282964v3⟩



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