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dc.contributor.authorDe Beer, M.
dc.contributor.authorDu Toit, C.G.
dc.contributor.authorRousseau, P.G.
dc.date.accessioned2017-02-28T11:20:38Z
dc.date.available2017-02-28T11:20:38Z
dc.date.issued2017
dc.identifier.citationDe Beer, M. et al. 2017. A methodology to investigate the contribution of conduction and radiation heat transfer to the effective thermal conductivity of packed graphite pebble beds, including the wall effect. Nuclear engineering and design, 314:67-81. [https://doi.org/10.1016/j.nucengdes.2017.01.010]en_US
dc.identifier.issn0029-5493
dc.identifier.urihttp://hdl.handle.net/10394/20602
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0029549317300109
dc.identifier.urihttps://doi.org/10.1016/j.nucengdes.2017.01.010
dc.description.abstractThe effective thermal conductivity represents the overall heat transfer characteristics of a packed bed of spheres and must be considered in the analysis and design of pebble bed gas-cooled reactors. During depressurized loss of forced cooling conditions the dominant heat transfer mechanisms for the passive removal of decay heat are radiation and conduction. Predicting the value of the effective thermal conductivity is complex since it inter alia depends on the temperature level and temperature gradient through the bed, as well as the pebble packing structure. The effect of the altered packing structure in the wall region must therefore also be considered. Being able to separate the contributions of radiation and conduction allows a better understanding of the underlying phenomena and the characteristics of the resultant effective thermal conductivity. This paper introduces a purpose-designed test facility and accompanying methodology that combines physical measurements with Computational Fluid Dynamics (CFD) simulations to separate the contributions of radiation and conduction heat transfer, including the wall effects. Preliminary results obtained with the methodology offer important insights into the trends observed in the experimental results and provide a better understanding of the interplay between the underlying heat transfer phenomenaen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectEffective thermal conductivityen_US
dc.subjectNear-wall effecten_US
dc.subjectPacked pebble beden_US
dc.subjectThermal radiationen_US
dc.subjectThermal conductionen_US
dc.subjectComputational fluid dynamicsen_US
dc.titleA methodology to investigate the contribution of conduction and radiation heat transfer to the effective thermal conductivity of packed graphite pebble beds, including the wall effecten_US
dc.typeArticleen_US
dc.contributor.researchID10184600 - Du Toit, Charl Gabriel De Kock
dc.contributor.researchID10199365 - Rousseau, Pieter Gerhardus


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