Novel Thermal Conductivity Measurement Technique Utilizing a Transient Multilayer Analytical Model of a Line Heat Source Probe for Extreme Environments

Wada, Katelyn; Fleming, Austin; Estrada, David

doi:10.1007/978-3-031-22638-0_13

Cited by 1 publication

(2 citation statements)

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“…70 (212 μm) sieve (40/70) was chosen for measurements (Figure ). Sintered bauxite has been a promising material utilized in energy storage and thermal transport systems and presents a wide working temperature window (673–1273 K). ,,− We used our previously developed line source method , to elucidate the thermal conductivity of the sintered bauxite pebble bed sample. This technique has been shown to enhance the capabilities of the traditional line heat source technique for thermal conductivity measurements of solid samples acting as surrogate nuclear fuels. − Here, we present the technique as a promising approach for determining the thermal conductivity near the inner wall (Figure a) of a pebble bed system compared to the thermal conductivity deeper into the bulk of the material.…”

Section: Methodsmentioning

confidence: 99%

“…Sintered bauxite has been a promising material utilized in energy storage and thermal transport systems and presents a wide working temperature window (673−1273 K). 2,12,21−23 We used our previously developed line source method 24,25 to elucidate the thermal conductivity of the sintered bauxite pebble bed sample. This technique has been shown to enhance the capabilities of the traditional line heat source technique for thermal conductivity measurements of solid samples acting as surrogate nuclear fuels.…”

Section: ■ Methodsmentioning

confidence: 99%

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Analysis of Near-Wall Pebble Bed Thermal Conductivity for Energy Applications

Wada,

Eixenberger,

Stout

et al. 2023

ACS Omega

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Pebble beds have been employed in thermal storage and energy systems, where they are typically used to promote heat exchange in high-temperature environments. Understanding the heat conduction of the entire pebble bed could aid in the material selection of the pebbles themselves and structural components, system design, and safety monitoring. However, the thermal conductivity of pebble beds can change significantly near geometric boundaries. Using a complex multilayer analytical model in conjunction with a line source probe, we found a substantial increase in the thermal conductivity of a sintered bauxite pebble bed in the near-wall region (7.6 W m −1 K −1 ) compared to the bulk (0.59 W m −1 K −1 ). We investigated this difference by comparing porosity results, acquired with micro-CT, of 33.18 and 33.31% at approximately one pebble width surrounding the probe (near-wall) and the bulk of the pebble bed, suggesting that the thermal conductivity is largely altered by thermal contact resistance in the nearwall regime.

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