A new laboratory-scale experimental facility for detailed aerothermal characterizations of volumetric absorbers

Gomez-Garcia, Fabrisio; Santiago, Sergio; Luque, Salvador; Romero, Manuel; González-Aguilar, José

doi:10.1063/1.4949070

Cited by 9 publications

(7 citation statements)

References 16 publications

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“…1(a). The concentrated light source is a 10 kW Xenon short arc lamp with Lorentzian intensity distribution [20,21]. The power of the concentrated light source is controlled using a 0-10 V external control voltage.…”

Section: Physical System Modelingmentioning

confidence: 99%

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

Abuseada

Alghfeli

et al. 2021

Journal of Heat Transfer

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This work reports a method to measure thermal diffusivity of thin disk samples at high temperatures (900 -1150K) using a modified Angstrom's method. Conventionally, samples are heated indirectly from the surroundings to reach high temperatures for such measurements, and this process is time-consuming, typically requiring hours to reach stable temperatures. In this work samples are heated directly in a custom instrument by a concentrated light source and are able to reach high steady-periodic temperatures in 10 mins, thus enabling rapid thermal diffusivity characterization. Further, existing Angstrom's methods for high temperatures use thermocouples for temperature detection that are commonly attached to samples via drilling and welding, which are destructive to samples and introduce thermal anomalies. In this work we use an infrared camera calibrated to 2000 C for non-contact, non-destructive and data-rich temperature measurements. We present an image analysis approach to process the IR data that significantly reduces random noise in temperature measurements. We extract amplitude and phase from processed temperature profiles and demonstrate that these metrics are insensitive to uncertainty in emissivity. Previous studies commonly use regression approaches for parameter estimation that are ill-posed (i.e., non-unique solutions) and lack rigorous characterization of parameter uncertainties. Here, we employ a surrogate-accelerated Bayesian framework and a 'No-U-Turn' sampler for uncertainty quantification. The reported results are validated using graphite and copper disks and exhibit excellent agreement within 5% as compared to reference values obtained by other methods.

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Section: Physical System Modelingmentioning

confidence: 99%

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

Abuseada

Alghfeli

et al. 2021

Journal of Heat Transfer

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“…Experimental results such as those presented in the previous section show that even when the system is completely aligned, the flux distribution tends to decrease rapidly from the centre (in the radial direction), and from the focal point (in the axial direction), significantly decreasing the range of applications for this source of energy. A solution often used to overcome this problem [24][25][26] is to use a multi-mirror homogeniser (Figure 2), to try to obtain a more homogeneous distribution for the flux of energy, as a result of the many reflections that take place inside the homogeniser, that tend to mix the radiation beam.…”

Section: Homogeniser Flux Distributionmentioning

confidence: 99%

Homogeneous Flux Distribution in High-Flux Solar Furnaces

Pereira

Rodríguez²,

Fernandes

et al. 2020

Energies

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Comparisons between experimental data and ray-tracing simulation results are presented for the high-flux SF60 solar furnace available at the Plataforma Solar de Almeria, Spain, which has an estimated thermal power of 60 kW. Since an important issue in many applications of solar concentrated radiation is to obtain a radiation distribution that is as homogeneous as possible over the central working area, so-called radiation homogenisers were also used but the degree of success achieved is just satisfactory, as the results show. Finally, further modelling studies using ray-tracing simulations aiming to attain a homogenous distribution of flux by means of double reflexion using two paraboloid surfaces are presented.

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“…As an example, Figure 6 shows the measured flux distribution of the irradiance (energy flux) in a plane (perpendicular to the beam and close to the focal zone), when the solar radiation is first concentrated by a parabolic concave surface. Instead of a Gaussian-type distribution, it is also suggested that the radiation flux profile produced by a parabolic concave surface in a high flux solar furnace can be approximated by a Cauchy-Lorentz distribution [67]. In conclusion, upon the traditional direct concentrated solar radiation exposure, it is rather difficult to ensure a homogenous temperature distribution throughout the exposed samples.…”

Section: Main Difficulties In the Use Of Concentrated Solar Radiationmentioning

confidence: 99%

“…A much more homogeneous flux distribution is needed for most of the thermal treatments used for (solid) materials processing, particularly at the industrial scale. Therefore-to overcome this difficulty, inherent to the manipulation of concentrated solar energy-light or radiation homogenizers are nowadays being developed [67,68]. Ideally a uniform incident profile would lead to the homogeneous heating of the sample if the sample is also homogeneous.…”

Section: Main Difficulties In the Use Of Concentrated Solar Radiationmentioning

confidence: 99%

Solar Heat for Materials Processing: A Review on Recent Achievements and a Prospect on Future Trends

Rosa

2019

ChemEngineering

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Considering works published in the literature for more than a decade (period from January 2008 till June 2019), this paper provides an overview of recent applications of the so-called “solar furnaces”, their reactors, process chambers and related devices, aiming specifically at the processing of (solid) materials. Based on the author’s own experience, some prospects on future trends are also presented. The aim of this work is to demonstrate the tremendous potentialities of the usage of solar heat for materials processing, but also to reveal the necessity of further developing solar-driven high-temperature technologies (which are required to displace the use of electricity or natural gas). In particular, it is essential to improve the temperature homogeneity conditions inside reaction chambers for materials processing using solar heat. Moreover, new innovative modular systems, practical and flexible, for capture, concentration, control and conduction of concentrated solar radiation are suggested. Solar thermal technologies for the production of electricity, as well as solar thermochemical processes for production of gases or liquids, are outside the scope of this review.

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A new laboratory-scale experimental facility for detailed aerothermal characterizations of volumetric absorbers

Cited by 9 publications

References 16 publications

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

Homogeneous Flux Distribution in High-Flux Solar Furnaces

Solar Heat for Materials Processing: A Review on Recent Achievements and a Prospect on Future Trends

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