A smoothed void fraction method for CFD-DEM simulation of packed pebble beds with particle thermal radiation

Wu, H, Gui, N, Yang, X, Tu, J and Jiang, S 2018, 'A smoothed void fraction method for CFD-DEM simulation of packed pebble beds with particle thermal radiation', International Journal of Heat and Mass Transfer, vol. 118, pp. 275-288.


Document type: Journal Article
Collection: Journal Articles

Title A smoothed void fraction method for CFD-DEM simulation of packed pebble beds with particle thermal radiation
Author(s) Wu, H
Gui, N
Yang, X
Tu, J
Jiang, S
Year 2018
Journal name International Journal of Heat and Mass Transfer
Volume number 118
Start page 275
End page 288
Total pages 14
Publisher Pergamon Press
Abstract 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 n = 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.
Subject Mathematical Sciences not elsewhere classified
Keyword(s) CFD-DEM
Packed pebble bed
Particle
Particle radiation
Smoothing void distribution
Sub-particle
DOI - identifier 10.1016/j.ijheatmasstransfer.2017.10.123
Copyright notice © 2017 Elsevier Ltd
ISSN 0017-9310
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