High-precision interferometric measurement of slow and fast temperature changes in static fluid and convective flow
High-precision interferometric measurement of slow and fast temperature changes in static fluid and convective flow
We explore the strengths and limitations of using a standard Michelson interferometer to sample line-of-sight-averaged temperature in water via two experimental setups: slow-varying temperature in static fluid and fast temperature variations in convective flow. The high precision of our measurements (a few mK) is enabled by the fast response time and high sensitivity of the interferometer to minute changes in the refractive index of water caused by temperature variations. These features allow us to detect the signature of fine fluid dynamical patterns in convective flow in a fully non-intrusive manner. For example, we are able to observe an asymmetry in the rising thermal plume (i.e., an asynchronous arrival of two counter-rotating vortices at the measurement location), which is not possible to resolve with more traditional (and invasive) techniques, such as RTD (Resistance Temperature Detector) sensors. These findings, and the overall reliability of our method, are further corroborated by means of Particle Image Velocimetry and Large Eddy Simulations. While this method presents inherent limitations (mainly stemming from the line-of-sight-averaged nature of its results), its non-intrusiveness and robustness, along with the ability to readily yield real-time, highly accurate measurements, render this technique very attractive for a wide range of applications in experimental fluid dynamics.
Ge, Xinyang
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Zielińska, Joanna A.
3eec837d-412c-4c2f-95f4-fde9d7279bb5
Maldonado, Sergio
b303ef8c-52d6-40ed-bf48-59efb4265a85
Ge, Xinyang
3df78992-78e0-4c86-b10e-dcdaa53cacdb
Zielińska, Joanna A.
3eec837d-412c-4c2f-95f4-fde9d7279bb5
Maldonado, Sergio
b303ef8c-52d6-40ed-bf48-59efb4265a85
Ge, Xinyang, Zielińska, Joanna A. and Maldonado, Sergio
(2023)
High-precision interferometric measurement of slow and fast temperature changes in static fluid and convective flow.
Experiments in Fluids, 64 (11), [178].
(doi:10.1007/s00348-023-03720-w).
Abstract
We explore the strengths and limitations of using a standard Michelson interferometer to sample line-of-sight-averaged temperature in water via two experimental setups: slow-varying temperature in static fluid and fast temperature variations in convective flow. The high precision of our measurements (a few mK) is enabled by the fast response time and high sensitivity of the interferometer to minute changes in the refractive index of water caused by temperature variations. These features allow us to detect the signature of fine fluid dynamical patterns in convective flow in a fully non-intrusive manner. For example, we are able to observe an asymmetry in the rising thermal plume (i.e., an asynchronous arrival of two counter-rotating vortices at the measurement location), which is not possible to resolve with more traditional (and invasive) techniques, such as RTD (Resistance Temperature Detector) sensors. These findings, and the overall reliability of our method, are further corroborated by means of Particle Image Velocimetry and Large Eddy Simulations. While this method presents inherent limitations (mainly stemming from the line-of-sight-averaged nature of its results), its non-intrusiveness and robustness, along with the ability to readily yield real-time, highly accurate measurements, render this technique very attractive for a wide range of applications in experimental fluid dynamics.
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s00348-023-03720-w
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Accepted/In Press date: 1 October 2023
e-pub ahead of print date: 28 October 2023
Additional Information:
Funding Information:
Partial funding was received from the University of Southampton. XG was partly funded by the University of Southampton through a Presidential Scholarship.
Publisher Copyright:
© 2023, The Author(s).
Identifiers
Local EPrints ID: 483476
URI: http://eprints.soton.ac.uk/id/eprint/483476
ISSN: 0723-4864
PURE UUID: 15b463e9-17c7-4e8e-8f82-a23977aa9d09
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Date deposited: 31 Oct 2023 17:58
Last modified: 21 Apr 2024 01:55
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Author:
Xinyang Ge
Author:
Joanna A. Zielińska
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