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

Wada, Katelyn; Eixenberger, Josh; Stout, Dallin; Jaques, Brian J.; Otanicar, Todd; Estrada, David

doi:10.1021/acsomega.3c08202

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

Journal Article · 28 December 2023 · ACS Omega

DOI: https://doi.org/10.1021/acsomega.3c08202 · OSTI ID:2263497

Wada, Katelyn ^[1];

^[1]; Stout, Dallin ^[1]; Jaques, Brian J. ^[2]; Otanicar, Todd ^[1];

^[2]

Boise State University, ID (United States)
Boise State University, ID (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)

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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Research Organization:: Boise State Univ., ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0009375; AC07-05ID14517

OSTI ID:: 2263497

Alternate ID(s):: OSTI ID: 2280759

Journal Information:: ACS Omega, Vol. 9, Issue 1; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Layers
Porosity
Probes
Thermal conductivity
Thermodynamic modeling

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