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

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

Min-Tsung Kao
Dept of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan

Yu-Hsin Tung
Dept of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan

Yuh-Ming Ferng
Institute of Nuclear Engineering and Science, National Tsing Hua University Hsinchu, Taiwan 30043, ROC

Ching-Chang Chieng
National Tsing Hua University Engineering and System Science Department Hsinchu city, Taiwan; Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong

MinKing K. Chyu
Department of Mechanical Engineering and Materials Science University of Pittsburgh, Pittsburgh, PA 15261, USA

Abstract

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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