Numerical study of pebble recirculation in a two-dimensional pebble bed of stationary atmosphere using LB-IB-DEM coupled method

Gui, N, Li, Z, Zhang, Z, Yang, X, Tu, J and Jiang, S 2019, 'Numerical study of pebble recirculation in a two-dimensional pebble bed of stationary atmosphere using LB-IB-DEM coupled method', Annals of Nuclear Energy, vol. 124, pp. 58-68.


Document type: Journal Article
Collection: Journal Articles

Title Numerical study of pebble recirculation in a two-dimensional pebble bed of stationary atmosphere using LB-IB-DEM coupled method
Author(s) Gui, N
Li, Z
Zhang, Z
Yang, X
Tu, J
Jiang, S
Year 2019
Journal name Annals of Nuclear Energy
Volume number 124
Start page 58
End page 68
Total pages 11
Publisher Pergamon Press
Abstract The pebble bed is one type of the core of the high temperature gas-cooled reactor (HTGR), which is regarded as the candidate of the generation IV advanced reactor. It is important to explore the gas-pebble flow characteristics and the pebble recirculation under the helium atmosphere. In this work, we presented a lattice Boltzmann (LB) method immersed boundary (IB) method discrete element method (DEM) coupled approach to simulate a test facility of pebble bed under the recirculation mode of operation. After model validation by an experiment of sphere sedimentation, the process of pebble recirculated at five constant rates are simulated. The correlations of gas motion and pebble motion in the upper and lower half beds are analyzed to uncover the inter-phase relationships for such intermittent pebble flows. Based on the systematic analyses of the two-phase flows, including the mean field and r.m.s field, the historical variation, inter-correlation, and the spectrum and phase space representations, we found sufficient evidences for the characteristics of intermittency, simultaneity, periodicity, and linear dependence for the inter-phase interaction of gas-pebble flows.
Subject Numerical Modelling and Mechanical Characterisation
Keyword(s) Coupled simulation
Discrete element method
Immersed boundary
Lattice-Boltzmann
Pebble bed reactor
Pebble recirculation
DOI - identifier 10.1016/j.anucene.2018.09.018
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0306-4549
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