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Erschienen in: Experiments in Fluids 4/2019

01.04.2019 | Research Article

Unsteady flows measurements using a calorimetric wall shear stress micro-sensor

verfasst von: Cecile Ghouila-Houri, Abdelkrim Talbi, Romain Viard, Quentin Gallas, Eric Garnier, Alain Merlen, Philippe Pernod

Erschienen in: Experiments in Fluids | Ausgabe 4/2019

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Abstract

A microscale low power high temperature gradient calorimetric (HTGC) sensor measuring both mean and fluctuating bidirectional wall shear stress is presented. The micromachined sensor is composed of three free-standing \(3\,\upmu \text {m}\times 1\) mm micro-wires mechanically supported using perpendicular micro-bridges. The static and dynamic characterisations were performed in a turbulent boundary layer wind tunnel on a flat plate configuration, and compared to the one obtained with a conventional hot-film probe. The results demonstrated that the calorimetric sensor behaves similarly to the hot-film in constant temperature anemometry with nonetheless lower power consumption and better spatial resolution and temporal response. Additionally, its calorimetric measurement detected the direction of the wall shear stress component orthogonal to the wires, corresponding to the shear stress sign in 2D flows. The calibrated HTGC micro-sensor was then used for unsteady flow separation detection downstream a 2D square rib for \(Re_h= 2.56\times 10^4\). The calorimetric micro-sensor enabled self-correlated measurements and consequently successfully achieved the detection of flow separation and the reattachment point around \(x/h=10.7\).

Graphical abstract

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Metadaten
Titel
Unsteady flows measurements using a calorimetric wall shear stress micro-sensor
verfasst von
Cecile Ghouila-Houri
Abdelkrim Talbi
Romain Viard
Quentin Gallas
Eric Garnier
Alain Merlen
Philippe Pernod
Publikationsdatum
01.04.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
Experiments in Fluids / Ausgabe 4/2019
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-019-2714-5

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