Geometric sensitivity of the NSTAP

Ian E. Gunady; Liuyang Ding; Marcus Hultmark; Alexander J. Smits

doi:10.1007/s00348-025-03983-5

Geometric sensitivity of the NSTAP

Ian E. Gunady, Liuyang Ding, Marcus Hultmark, Alexander J. Smits

Research output: Contribution to journal › Article › peer-review

Abstract

The nanoscale thermal anemometry probe (NSTAP) has been widely used to measure turbulence levels in high Reynolds number flows. Here, we report that the probe measurements are geometrically sensitive to its particular orientation in the flow under certain conditions. The geometric sensitivity appears as an amplification of the turbulence signal but has no effect on the mean. Data are taken using an NSTAP in multiple configurations and compared to data from previous studies and a conventional hot-wire. Results suggest that geometric sensitivity is caused by a difference between the mean and dynamic calibrations of the NSTAP.

Original language	English (US)
Article number	49
Journal	Experiments in Fluids
Volume	66
Issue number	3
DOIs	https://doi.org/10.1007/s00348-025-03983-5
State	Published - Mar 2025

All Science Journal Classification (ASJC) codes

Computational Mechanics
Mechanics of Materials
General Physics and Astronomy
Fluid Flow and Transfer Processes

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10.1007/s00348-025-03983-5

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title = "Geometric sensitivity of the NSTAP",

abstract = "The nanoscale thermal anemometry probe (NSTAP) has been widely used to measure turbulence levels in high Reynolds number flows. Here, we report that the probe measurements are geometrically sensitive to its particular orientation in the flow under certain conditions. The geometric sensitivity appears as an amplification of the turbulence signal but has no effect on the mean. Data are taken using an NSTAP in multiple configurations and compared to data from previous studies and a conventional hot-wire. Results suggest that geometric sensitivity is caused by a difference between the mean and dynamic calibrations of the NSTAP.",

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AU - Gunady, Ian E.

AU - Ding, Liuyang

AU - Hultmark, Marcus

AU - Smits, Alexander J.

N1 - Publisher Copyright: © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

PY - 2025/3

Y1 - 2025/3

N2 - The nanoscale thermal anemometry probe (NSTAP) has been widely used to measure turbulence levels in high Reynolds number flows. Here, we report that the probe measurements are geometrically sensitive to its particular orientation in the flow under certain conditions. The geometric sensitivity appears as an amplification of the turbulence signal but has no effect on the mean. Data are taken using an NSTAP in multiple configurations and compared to data from previous studies and a conventional hot-wire. Results suggest that geometric sensitivity is caused by a difference between the mean and dynamic calibrations of the NSTAP.

AB - The nanoscale thermal anemometry probe (NSTAP) has been widely used to measure turbulence levels in high Reynolds number flows. Here, we report that the probe measurements are geometrically sensitive to its particular orientation in the flow under certain conditions. The geometric sensitivity appears as an amplification of the turbulence signal but has no effect on the mean. Data are taken using an NSTAP in multiple configurations and compared to data from previous studies and a conventional hot-wire. Results suggest that geometric sensitivity is caused by a difference between the mean and dynamic calibrations of the NSTAP.

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Geometric sensitivity of the NSTAP

Abstract

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