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Verification of flow velocity measurements using micrometer-order thermometers

In flow velocity measurements, resolution, miniaturization, and accuracy of measuring devices are important issues because the measuring devices significantly affect the flow in the micro-space, sonic flow, and turbulent flow. We studied recovery temperature anemometry (RTA) using micrometer-order t...

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Autores principales: Takegawa, Naoki, Ishibashi, Masahiro, Iwai, Aya, Furuichi, Noriyuki, Morioka, Toshihiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8664851/
https://www.ncbi.nlm.nih.gov/pubmed/34893647
http://dx.doi.org/10.1038/s41598-021-02877-w
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author Takegawa, Naoki
Ishibashi, Masahiro
Iwai, Aya
Furuichi, Noriyuki
Morioka, Toshihiro
author_facet Takegawa, Naoki
Ishibashi, Masahiro
Iwai, Aya
Furuichi, Noriyuki
Morioka, Toshihiro
author_sort Takegawa, Naoki
collection PubMed
description In flow velocity measurements, resolution, miniaturization, and accuracy of measuring devices are important issues because the measuring devices significantly affect the flow in the micro-space, sonic flow, and turbulent flow. We studied recovery temperature anemometry (RTA) using micrometer-order thermometers and evaluated its validity in two velocity ranges (40–90 and 315–420 m/s) by conducting two experiments and a numerical simulation. The results confirmed that the difference between the reference velocity and RTA was within 5% in the velocity range 60–90 m/s for both the thermocouple and platinum thermometer given the same recovery temperature coefficient of 0.83. It is a valuable finding that velocity measurement by RTA is independent of the type of thermometer used. This suggests that the accuracy of about 5% can be guaranteed even without calibration by giving the recovery temperature coefficient according to the thermometer geometry, which is an excellent advantage not found in other anemometers. Furthermore, the supersonic flow measured using RTA agrees well with the simulation results and theoretical trends. Our findings ensure that the micrometer-order point measurement of flow velocity, which is difficult with existing anemometers, using RTA is possible over a wide range of flow velocities.
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spelling pubmed-86648512021-12-13 Verification of flow velocity measurements using micrometer-order thermometers Takegawa, Naoki Ishibashi, Masahiro Iwai, Aya Furuichi, Noriyuki Morioka, Toshihiro Sci Rep Article In flow velocity measurements, resolution, miniaturization, and accuracy of measuring devices are important issues because the measuring devices significantly affect the flow in the micro-space, sonic flow, and turbulent flow. We studied recovery temperature anemometry (RTA) using micrometer-order thermometers and evaluated its validity in two velocity ranges (40–90 and 315–420 m/s) by conducting two experiments and a numerical simulation. The results confirmed that the difference between the reference velocity and RTA was within 5% in the velocity range 60–90 m/s for both the thermocouple and platinum thermometer given the same recovery temperature coefficient of 0.83. It is a valuable finding that velocity measurement by RTA is independent of the type of thermometer used. This suggests that the accuracy of about 5% can be guaranteed even without calibration by giving the recovery temperature coefficient according to the thermometer geometry, which is an excellent advantage not found in other anemometers. Furthermore, the supersonic flow measured using RTA agrees well with the simulation results and theoretical trends. Our findings ensure that the micrometer-order point measurement of flow velocity, which is difficult with existing anemometers, using RTA is possible over a wide range of flow velocities. Nature Publishing Group UK 2021-12-10 /pmc/articles/PMC8664851/ /pubmed/34893647 http://dx.doi.org/10.1038/s41598-021-02877-w Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Takegawa, Naoki
Ishibashi, Masahiro
Iwai, Aya
Furuichi, Noriyuki
Morioka, Toshihiro
Verification of flow velocity measurements using micrometer-order thermometers
title Verification of flow velocity measurements using micrometer-order thermometers
title_full Verification of flow velocity measurements using micrometer-order thermometers
title_fullStr Verification of flow velocity measurements using micrometer-order thermometers
title_full_unstemmed Verification of flow velocity measurements using micrometer-order thermometers
title_short Verification of flow velocity measurements using micrometer-order thermometers
title_sort verification of flow velocity measurements using micrometer-order thermometers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8664851/
https://www.ncbi.nlm.nih.gov/pubmed/34893647
http://dx.doi.org/10.1038/s41598-021-02877-w
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