Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 118, Issue -, Pages 275-288Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2017.10.123
Keywords
Packed pebble bed; Particle; CFD-DEM; Sub-particle; Smoothing void distribution; Particle radiation
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Funding
- National Natural Science Foundations of China [51406100, 51576211]
- Science Fund for Creative Research Groups of National Natural Science Foundation of China [51321002]
- National High Technology Research and Development Program of China (863) [2014AA052701]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201438]
- China Scholarship Council (CSC) [201506210365]
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The core of the high temperature gas-cooled reactor (HTGR) is a dense packed pebble bed with large sized fuel spheres. In the CFD-DEM simulations of fluid-particle systems on sub-particle scale mesh, a smoothed void fraction method (SVFM) is developed to compute the void fraction field based on the particle position and volume. A diffusion function is obtained analytically as a spatial distribution function of particle volume in SVFM, which converges to the step-function-type distribution of particle volume in the sub-particle-scale divided finite volume method (DFVM) when the smoothing degree goes to 0. In validation by a spout fluidized bed when the cell size is less than the particle diameter, it is shown that SVFM is preferable to DFVM for the CFD-DEM simulation since it is in better agreement with the experimental measurements. Moreover, the CFD-DEM simulation using the SVFM on sub-particle scale meshes is performed for the benchmark problem of the HTR-10 reactor. The numerical results at the smoothing degree of eta = 0.5 are in good agreement with the empirical code of THERMIX - which is based on experimental measurements. In addition, the discussion indicates that the smoothing degree in SVFM is recommended to be 0.5-0.7 according to the void fraction distribution of Voronoi-tessellation. (C) 2017 Elsevier Ltd. All rights reserved.
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