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Experiments in Fluids
Published in: Experiments in Fluids 10/2019

01-10-2019 | Research Article

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

Authors: K. Kokmanian, S. Scharnowski, M. Bross, S. Duvvuri, M. K. Fu, C. J. Kähler, M. Hultmark

Published in: Experiments in Fluids | Issue 10/2019

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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.

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previous article Particle image velocimetry in refractive index fields of combustion flows
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Metadata
Title
Development of a nanoscale hot-wire probe for supersonic flow applications
Authors
K. Kokmanian
S. Scharnowski
M. Bross
S. Duvvuri
M. K. Fu
C. J. Kähler
M. Hultmark
Publication date
01-10-2019
Publisher
Springer Berlin Heidelberg
Published in
Experiments in Fluids / Issue 10/2019
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-019-2797-z

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