Fiber Bragg grating thermometry application to measure flow: laminar and turbulent regimes

Rodolfo Luiz Patyk; Leandro Grabarski; Hypolito José Kalinowski

doi:10.1364/AO.483249

Applied Optics
Vol. 62,
Issue 16,
pp. E92-E95
(2023)
•https://doi.org/10.1364/AO.483249

Fiber Bragg grating thermometry application to measure flow: laminar and turbulent regimes

Rodolfo Luiz Patyk, Leandro Grabarski, and Hypolito José Kalinowski

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Rodolfo Luiz Patyk, Leandro Grabarski, and Hypolito José Kalinowski, "Fiber Bragg grating thermometry application to measure flow: laminar and turbulent regimes," Appl. Opt. 62, E92-E95 (2023)

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Related Topics
Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
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About this Article
History
- Original Manuscript: December 13, 2022
- Revised Manuscript: March 21, 2023
- Manuscript Accepted: April 20, 2023
- Published: May 16, 2023

Abstract

Flow characteristic properties in pipelines are determined from the temperature evolution, measured by fiber Bragg gratings, after transit of a thermal slug. Results analyze both laminar and turbulent flow regimes.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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	Rise Time (s)		Ratio	Fall Time (s)		Ratio
Regime	FBG	TC	$τ_{F B G} / τ_{T C}$	FBG	TC	$τ_{F B G} / τ_{T C}$
Laminar	17.3	19.3	0.87	19.8	21.5	0.92
Transition	6.48	8.52	0.76	6.65	8.53	0.78
Turbulent	2.60	3.03	0.86	2.21	0.80	1.25

Regime	Reynolds Number Range	$\bar{ν}$ FBG $({m s}^{- 1})$	Accuracy $(%)$	$\bar{ν}$ TC $({m s}^{- 1})$	Accuracy $(%)$
Laminar	1182–2153	0.0868	98	0.079	77
Transition	2880–5279	0.231	90	0.182	71
Turbulent	9984–18,500	0.652	75	0.495	57

	Rise Time (s)		Ratio	Fall Time (s)		Ratio
Regime	FBG	TC	$τ_{F B G} / τ_{T C}$	FBG	TC	$τ_{F B G} / τ_{T C}$
Laminar	17.3	19.3	0.87	19.8	21.5	0.92
Transition	6.48	8.52	0.76	6.65	8.53	0.78
Turbulent	2.60	3.03	0.86	2.21	0.80	1.25

Regime	Reynolds Number Range	$\bar{ν}$ FBG $({m s}^{- 1})$	Accuracy $(%)$	$\bar{ν}$ TC $({m s}^{- 1})$	Accuracy $(%)$
Laminar	1182–2153	0.0868	98	0.079	77
Transition	2880–5279	0.231	90	0.182	71
Turbulent	9984–18,500	0.652	75	0.495	57

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Applied Optics