A model of heat transfer dynamics of coupled multiphase-flow and neutron-radiation: Application to a nuclear fluidized bed reactor

Christopher C. Pain (Corresponding Author), Jefferson L.M.A. Gomes, Matthew D. Eaton, Cassiano R.E. de Oliveira, Anthony J.H. Goddard

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Purpose – To present dynamical analysis of axisymmetric and three-dimensional (3D) simulations of a nuclear fluidized bed reactor. Also to determine the root cause of reactor power fluctuations.

Design/methodology/approach – We have used a coupled neutron radiation (in full phase space) and high resolution multiphase gas-solid Eulerian-Eulerian model.

Findings – The reactor can take over 5?min after start up to establish a quasi-steady-state and the mechanism for the long term oscillations of power have been established as a heat loss/generation mechanism. There is a clear need to parameterize the temperature of the reactor and, therefore, its power output for a given fissile mass or reactivity. The fission-power fluctuates by an order of magnitude with a frequency of 0.5-2?Hz. However, the thermal power output from gases is fairly steady.

Research limitation/implications – The applications demonstrate that a simple surrogate of a complex model of a nuclear fluidised bed can have a predictive ability and has similar statistics to the more complex model.

Practical implications – This work can be used to analyze chaotic systems and also how the power is sensitive to fluctuations in key regions of the reactor.

Originality/value – The work presents the first 3D model of a nuclear fluidised bed reactor and demonstrates the value of numerical methods for modelling new and existing nuclear reactors.
Original languageEnglish
Pages (from-to)765-807
Number of pages43
JournalInternational Journal of Numerical Methods for Heat & Fluid Flow
Volume15
Issue number8
DOIs
Publication statusPublished - 2005

Keywords

  • flow
  • heat transfer
  • nuclear reactors
  • numerical analysis

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