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Wada K, Eixenberger J, Stout D, Jaques BJ, Otanicar T, Estrada D. Analysis of Near-Wall Pebble Bed Thermal Conductivity for Energy Applications. ACS OMEGA 2024; 9:1614-1619. [PMID: 38222600 PMCID: PMC10785668 DOI: 10.1021/acsomega.3c08202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/07/2023] [Accepted: 12/13/2023] [Indexed: 01/16/2024]
Abstract
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 near-wall regime.
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Affiliation(s)
- Katelyn Wada
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Josh Eixenberger
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center
for Advanced Energy Studies, Boise State
University, Boise, Idaho 83725, United States
- Department
of Physics, Boise State University, Boise, Idaho 83725, United States
| | - Dallin Stout
- Department
of Mechanical and Biomedical Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Brian J. Jaques
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center
for Advanced Energy Studies, Boise State
University, Boise, Idaho 83725, United States
- Idaho
National Laboratory, Idaho Falls, Idaho 83415, United States
| | - Todd Otanicar
- Department
of Mechanical and Biomedical Engineering, Boise State University, Boise, Idaho 83725, United States
| | - David Estrada
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center
for Advanced Energy Studies, Boise State
University, Boise, Idaho 83725, United States
- Idaho
National Laboratory, Idaho Falls, Idaho 83415, United States
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Flow characteristics and packing structures of dense granular flow around an immersed cylindrical tube. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bu S, Li Z, Ma Z, Sun W, Zhang L, Chen D. Numerical study of natural convection effects on effective thermal conductivity in a pebble bed. ANN NUCL ENERGY 2020. [DOI: 10.1016/j.anucene.2020.107524] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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du Toit C, van Antwerpen H. Effect of reactor vessel cooling insulation and reflector heat pipes on the temperatures of a pebble-bed reactor using a system CFD approach. NUCLEAR ENGINEERING AND DESIGN 2020. [DOI: 10.1016/j.nucengdes.2019.110421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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