Measurements of the directional spectral emissivity based on a radiation heating source with alternating spectral distributions

Fu, Tairan; Duan, Minghao; Tang, Jiahuan; Shi, Congling

doi:10.1016/j.ijheatmasstransfer.2015.07.064

Cited by 35 publications

(12 citation statements)

References 42 publications

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“…One of the available data source for POCO EDM-3 graphite reports the following equation between We have reported in Figure 5 the spectral emissivity values of porous graphites, with properties close to EDM-3, around 1 µm (laser used in our experiments) [18,[24][25][26], 1.5 µm (pyrometers used in our experiments) [18,26,27] and 0.65 µm [28,29] (different datasets available at this wavelength). It is difficult to identify clear trends in the temperature dependence except that the emissivity at 1-1.5 µm is higher than the total emissivity (in the range 0.85-0.95).…”

Section: B-optical Properties Of Edm-3mentioning

confidence: 90%

High power continuous wave laser heating of graphite in a high temperature range up to 3800 K

Gallais

Thibault

Lescoute

et al. 2021

Journal of Applied Physics

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As graphite is an important material for several applications, the evaluation of its properties at very high temperature is of major importance. Conducting studies at temperature > 2800K is however very challenging and the amount of available data in the literature is therefore very limited. This paper presents a methodology that compares experimental data to simulation results following a progressive increase of the temperature range investigated. The study was conducted on a commercial polycrystalline graphite produced by sintering (EDM3 from POCO) under high power continuous laser heating (kW Ytterbium at a wavelength of 1080 nm). Experiments were done inside a vacuum chamber equipped with pyrometers and cameras allowing fine monitoring of the temperature of the samples. A 3D numerical model has been developed based on the Finite Element Method to analyse the experimental results. The evolution of thermal and optical properties of EDM3 with temperature are required for modelling correctly the laser / material Interaction. By running sequential comparison of calculation with dedicated experiment we achieve better knowledge of such properties. From this study we obtain estimations of the evolution of thermal conductivity, emissivity and evaporation rate up to 3800 K of amorphous graphite.

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Section: B-optical Properties Of Edm-3mentioning

confidence: 90%

High power continuous wave laser heating of graphite in a high temperature range up to 3800 K

Gallais

Thibault

Lescoute

et al. 2021

Journal of Applied Physics

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“…Zhang et al [29] developed a facility that uses a monochromator and an integrating sphere to measure the directional-hemispherical reflectance of samples heated by a cylindrical furnace up to 900 K. They measured the spectral emittance for 0.4 μm£l£10 μm of selective coatings for CSP application. Fu et al [73] constructed an indirect emittance measurement system using a hemispherical heating source and placed the sample at the center of the base of the hemisphere. The heating source is made of a quartz lamp array with reflecting walls to produce a nearly diffuse irradiation on the sample surface.…”

Section: Indirect Measurementsmentioning

confidence: 99%

Spectral emittance measurements of micro/nanostructures in energy conversion: a review

et al. 2020

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Micro/nanostructures play a key role in tuning the radiative properties of materials and have been applied to high-temperature energy conversion systems for improved performance. Among the various radiative properties, spectral emittance is of integral importance for the design and analysis of materials that function as radiative absorbers or emitters. This paper presents an overview of the spectral emittance measurement techniques using both the direct and indirect methods. Besides, several micro/nanostructures are also introduced, and a special emphasis is placed on the emissometers developed for characterizing engineered micro/nanostructures in high-temperature applications (e.g., solar energy conversion and thermophotovoltaic devices). In addition, both experimental facilities and measured results for different materials are summarized. Furthermore, future prospects in developing instrumentation and micro/nanostructured surfaces for practical applications are also outlined. This paper provides a comprehensive source of information for the application of micro/nanostructures in high-temperature energy conversion engineering.

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“…This dynamic behavior of spectral emissivity poses a great challenge in the use of radiation thermometers. Multispectral radiation thermometry (MRT) can be used to address the above challenges and has widely been used in many applications [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] to measure temperature, mainly targeting metallic surfaces. Effectiveness of this technique is greatly dependent on emissivity model used.…”

Section: Introductionmentioning

confidence: 99%

Application of multispectral radiation thermometry in temperature measurement of thermal barrier coated surfaces

2016

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Measurements of the directional spectral emissivity based on a radiation heating source with alternating spectral distributions

Cited by 35 publications

References 42 publications

High power continuous wave laser heating of graphite in a high temperature range up to 3800 K

High power continuous wave laser heating of graphite in a high temperature range up to 3800 K

Spectral emittance measurements of micro/nanostructures in energy conversion: a review

Application of multispectral radiation thermometry in temperature measurement of thermal barrier coated surfaces

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