Temperature Dependence of Laser Induced Fluorescence in Molten LiF-NaF-KF Eutectic using Tb3+, Eu3+, and Dy3+

Orea, Daniel; Al-Mahbobi, Luma; Vaghetto, Rodolfo; Hassan, Yassin A.

doi:10.1016/j.jlumin.2021.118641

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…Moreover, a filter lens can be placed on the camera, in order to record only the frequencies emitted by the dye, even if this can decrease the amount of light recorded by the camera sensors. Further, the temperature can be measured by LIF, but with different techniques based, for instance, on the spectral analysis of the emitted light (see, e.g., the recent study of Orea et al [189], about the most suitable tracer for high-temperature molten salt applications, of Zhu et al [190], about the applications of LIF to the combustion diagnostics and practical engine measurements, or of McManamen et al [191], about the shock-wave-turbulence interactions in high-speed flight and propulsion). LIF can be coupled with PIV to obtain simultaneous measures of concentration and velocity (see, e.g., Savitskii et al [192], Zhang et al [193], Charogiannis et al [194]).…”

Section: Digital Image Analysis (Dia) Techniquesmentioning

confidence: 99%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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Turbulence is still an unsolved issue with enormous implications in several fields, from the turbulent wakes on moving objects to the accumulation of heat in the built environment or the optimization of the performances of heat exchangers or mixers. This review deals with the techniques and trends in turbulent flow simulations, which can be achieved through both laboratory and numerical modeling. As a matter of fact, even if the term “experiment” is commonly employed for laboratory techniques and the term “simulation” for numerical techniques, both the laboratory and numerical techniques try to simulate the real-world turbulent flows performing experiments under controlled conditions. The main target of this paper is to provide an overview of laboratory and numerical techniques to investigate turbulent flows, useful for the research and technical community also involved in the energy field (often non-specialist of turbulent flow investigations), highlighting the advantages and disadvantages of the main techniques, as well as their main fields of application, and also to highlight the trends of the above mentioned methodologies via bibliometric analysis. In this way, the reader can select the proper technique for the specific case of interest and use the quoted bibliography as a more detailed guide. As a consequence of this target, a limitation of this review is that the deepening of the single techniques is not provided. Moreover, even though the experimental and numerical techniques presented in this review are virtually applicable to any type of turbulent flow, given their variety in the very broad field of energy research, the examples presented and discussed in this work will be limited to single-phase subsonic flows of Newtonian fluids. The main result from the bibliometric analysis shows that, as of 2021, a 3:1 ratio of numerical simulations over laboratory experiments emerges from the analysis, which clearly shows a projected dominant trend of the former technique in the field of turbulence. Nonetheless, the main result from the discussion of advantages and disadvantages of both the techniques confirms that each of them has peculiar strengths and weaknesses and that both approaches are still indispensable, with different but complementary purposes.

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Section: Digital Image Analysis (Dia) Techniquesmentioning

confidence: 99%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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“…The duration of fluorescence afterglow is determined by the fluorescent material; at present, most fluorescence temperature sensors employ rare-earth metal ion-doped fluorescent materials, like, Dy 3+ , Tm 3+ , Nd 3+ , and Eu 3+ , among others. [19][20][21][22][23] Mn 4+ -fluoride-doped phosphors exhibit efficient narrowband luminescence shorter than 650 nm, boasting superior color purity and visual colorimetric parameters. 24,25 This paper introduces a scalable microtemperature monitoring system based on the fluorescence lifetime of K 2 SiF 6 :Mn 4+ phosphor fiber temperature sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the fluorescence lifetime sensor is not affected by the fluctuation of the excitation light source, and the temperature measurement is realized only according to the length of the fluorescence afterglow lifetime. The duration of fluorescence afterglow is determined by the fluorescent material; at present, most fluorescence temperature sensors employ rare‐earth metal ion‐doped fluorescent materials, like, Dy 3+ , Tm 3+ , Nd 3+ , and Eu 3+ , among others 19–23 . Mn 4+ ‐fluoride‐doped phosphors exhibit efficient narrowband luminescence shorter than 650 nm, boasting superior color purity and visual colorimetric parameters 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Design of a scalable microfiber optic temperature transmitter based on fluorescence lifetime

Shen,

Zhang,

Jia

et al. 2024

Micro & Optical Tech Letters

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To facilitate temperature detection in industrial production settings, an optical fiber temperature transmitter was developed utilizing fluorescence lifetime as its basis. Comprising an upper computer, fiber optic temperature transmitter, and optical fiber probe, the system incorporates a scalable fluorescence detection module. Real‐time temperature calculation is achieved through a microcontroller based on the fluorescence lifetime, with results transmitted to the upper computer, the optical fiber sensor exhibits a resolution of 0.01°C and an accuracy of ±0.3°C.

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