Optical properties of high temperature molten salt mixtures for volumetrically absorbing solar thermal receiver applications

Tetreault-Friend, Melanie; Gray, L.; Berdibek, Shapagat; McKrell, Thomas; Slocum, Alexander H.

doi:10.1016/j.solener.2017.05.054

Cited by 29 publications

(8 citation statements)

References 18 publications

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“…Lantelme [35] and Tetrault-Friend [36] present surveys of these results. Heat is transferred through the halide liquids almost entirely by a photon mechanism with the phonon conduction representing less than 10% of the mechanism.…”

Section: Heat Transfer In Liquid Slagsmentioning

confidence: 94%

“…The majority of researchers on this topic as applied to metallurgical slag systems have also taken great care to measure the phonon conductivity without interference from any radiation mechanisms [34,36,[42][43][44][45][46][47][48][49][50]; Kang [49] and Mills [50] present tabulations of experimental results. In these studies, the phonon conductivity for both fused salts and liquid oxide slags is found to lie between 0.1 and 1.5 W m −1 K −1 , which is well below all the values used in Table 1 except that of [3].…”

Section: Heat Transfer In Liquid Slagsmentioning

confidence: 99%

“…For liquids with a moderate or high transparency, inclusion of the temperature dependence of the photon conductivity is necessary to determine the temperature gradients on the liquid. Several authors [36,42,47,58,59] note that in respect of the liquid oxide slags used generally in steelmaking, the contributions of photon and phonon conductivity are approximately equal. Mikrovas [39] and Hasegawa [60] report that the effective thermal conductivity of steelmaking slags in the system CaO + Al 2 O 3 + SiO 2 lies in the range 2-2.5 W m −1 K −1 with the photon mechanism thus contributing more than half of the total conductivity, which following the above restriction implies that a description of conduction in this slag would require a more rigorous inclusion of the photon component's temperature dependence since the liquid has a significant photon conductivity.…”

Section: Heat Transfer In Liquid Slagsmentioning

confidence: 99%

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Heat transfer in ESR slags

Mitchell

Kelkar

2021

Ironmaking & Steelmaking

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The extensively published models of the ESR process assume a singular value of the slag thermal conductivity and employ that value in a format which assumes heat conduction entirely by a phonon mechanism. In this work we investigate the possibility that the mechanism is a phonon/ photon mechanism in a slag which is diathermanous. The conclusion is that such a model assumption better represents the practical behaviour of the process and should be used in model structures. It is also suggested that the concept has a wider application to other metallurgical processes which use slags having some degree of photon conductivity.

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Section: Heat Transfer In Liquid Slagsmentioning

confidence: 94%

Section: Heat Transfer In Liquid Slagsmentioning

confidence: 99%

Section: Heat Transfer In Liquid Slagsmentioning

confidence: 99%

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Heat transfer in ESR slags

Mitchell

Kelkar

2021

Ironmaking & Steelmaking

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“…The apparatus concept was originally conceived in the MIT Reactor Hydraulics Laboratory and used for transmission measurements of nitrate salts between 400-nm and 2.5-µm wavelengths. 11,12 For this work, the design was modified to handle fluoride and chloride salts at higher temperatures and longer wavelengths.…”

Section: Iiia Apparatus Design For Absorption Coefficient Measurementsmentioning

confidence: 99%

Advancing Radiative Heat Transfer Modeling in High-Temperature Liquid Salts

Coyle

Baglietto

Forsberg

2020

Nuclear Science and Engineering

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Liquid salts have become more attractive as coolants for low-carbon power generation due to needs for high-temperature heat and affordable energy storage. Of particular interest are halide salts utilized in fluoride-salt-cooled high-temperature reactors, molten salt reactors, and high-magnetic-field fusion machines, as well as in concentrated solar power systems. Because of their high-temperature operation and semitransparent nature, the liquid salts in these designs may experience the effects of participating media radiative heat transfer (RHT). While some work has been conducted on measuring the thermophysical properties of these fluids, there is currently very little known about their radiative properties. Here, we present the initial results of a two-part methodology to enhance RHT understanding and improve modeling in high-temperature liquid salts. First, an experimental apparatus designed to measure liquid chloride and fluoride salt absorption coefficients by Fourier transform infrared spectroscopy was completed and validated with water measurements. Second, computational fluid dynamics (CFD) simulations were run to determine the contribution of thermal radiation to the overall heat transfer for flow between parallel plates. This geometry was used to verify code accuracy and investigate requirements for absorption coefficient spectral banding. Future work will be to complete halide salt absorption measurements and couple them to the established CFD methods to identify geometries and temperatures where RHT is significant and enable prediction of heat transfer in such systems.

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“…Absorption of solar radiation inside a fluid layer is selective and is dependent on the solar spectrum [11]. The absorption of solar radiation penetrating a fluid layer at different depths is generally explained by Beer Lambert law I = I 0 e −αy .…”

Section: Introductionmentioning

confidence: 99%