3D DEM Simulation and Analysis of Void Fraction Distribution in a Pebble Bed High Temperature Reactor

Yang, X, Gui, N, Tu, J and Jiang, S 2014, '3D DEM Simulation and Analysis of Void Fraction Distribution in a Pebble Bed High Temperature Reactor', Nuclear Engineering and Design, vol. 270, pp. 404-411.


Document type: Journal Article
Collection: Journal Articles

Title 3D DEM Simulation and Analysis of Void Fraction Distribution in a Pebble Bed High Temperature Reactor
Author(s) Yang, X
Gui, N
Tu, J
Jiang, S
Year 2014
Journal name Nuclear Engineering and Design
Volume number 270
Start page 404
End page 411
Total pages 8
Publisher Elsevier B.V.
Abstract The current work analyzes the radial and axial distributions of void fraction of a pebble bed high temperature reactor. A three-dimensional pebble bed corresponding to our test facility of pebble bed type gas-cooled high temperature reactor (HTR-10) in Tsinghua University is simulated via discrete element method, and the radial and axial void fraction profiles are calculated. It validates the oscillating characteristics of radial void fraction near the wall. Detailed calculations show the differences of void fraction profiles between the stationary packing bed and the dynamically discharging bed. Based on the vertically and circumferentially averaged radial distribution and horizontally averaged axial distribution of void fraction, a fully three-dimensional analytical distribution of void fraction throughout the bed is established. The results show the combined effects of gravity and void variation in the pebble bed caused by the pebble discharging. It indicates the linearly increased packing effect caused by gravity in the vertical (axial) direction and the normal distribution of void in the horizontal (radial) direction by pebble drainage. These two effects coexist in the conical base of the bed whereas only the former effect exists in the cylindrical volume of the bed.
Subject Computational Fluid Dynamics
Numerical Modelling and Mechanical Characterisation
Keyword(s) Finite difference method
Normal distribution
Three dimensional
Two phase flow
Void fractionAxial distribution
Combined effect
DEM Simulation
Packing effects
Radial distributions
Tsinghua University
Void fraction distribution
Void fraction profiles
High temperature reactors
DOI - identifier 10.1016/j.nucengdes.2014.02.010
Copyright notice © 2014 Elsevier B.V.
ISSN 0029-5493
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
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