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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Heat transfer coefficient distributions on sphere surface in pebble bed core using different turbulence models

pages 2406-2417
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2480
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RÉSUMÉ

The heat transfer and flow field characteristics around a single or multiple spheres have been investigated at relatively low Reynolds numbers (Re) in the literature. This study aimed to obtain the heat transfer coefficient distributions on multiple spheres in a three-dimensional lattice form using both experiments and computational fluid dynamics (CFD) technology at Re values of 10,000, 20,000, and 26,000. The experiments provide a full picture of the heat transfer characteristics of spheres using transient liquid crystal technique, which is a non-destructive method. The CFD calculations were conducted under the same conditions in experiments using five turbulence models: the standard k-ε low-Re, AKN k-ε low-Re, standard k-ε two-layer, realizable k-ε two-layer, and v2-f models. Comparisons of the measured and computed parameters concluded that the v2-f turbulence model gives the best agreement compared with the other models due to its superior ability to capture non-isotropic turbulence near walls.

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