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Development of a nanoscale hot-wire probe for supersonic flow applications

Kokmanian, K and Scharnowski, S and Bross, M and Duvvuri, S and Fu, M K and Kaehler, C J and Hultmark, M (2019) Development of a nanoscale hot-wire probe for supersonic flow applications. In: EXPERIMENTS IN FLUIDS, 60 (10).

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Official URL: https://dx.doi.org/10.1007/s00348-019-2797-z

Abstract

A new nanoscale thermal anemometry probe (NSTAP) was designed and fabricated to measure mass flux in supersonic flows. This sensor was evaluated in the Trisonic Wind Tunnel Munich (TWM) at both subsonic and supersonic speeds. Subsonic compressible flow tests were performed to confirm the new sensor's repeatability and to compare its behaviour to measurements from a conventional cylindrical hot-wire, while supersonic tests were performed to investigate the nature of the convective heat transfer from the nanoscale sensor at those conditions. For the range of mass fluxes tested in the supersonic regime, a linear relationship between the Nusselt number and the Reynolds number fit the data well. A linear relationship has previously been noticed at length scales close to the molecular mean free path of the flow and has been attributed to the free-molecule flow regime, where the Knudsen number is on the order of unity.

Item Type: Journal Article
Additional Information: copyright for this article belongs to SPRINGER
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Depositing User: Id for Latest eprints
Date Deposited: 18 Oct 2019 11:50
Last Modified: 18 Oct 2019 11:50
URI: http://eprints.iisc.ac.in/id/eprint/63673

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