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Research Papers

Modeling the Flow and Heat Transfer in a Packed Bed High Temperature Gas-Cooled Reactor in the Context of a Systems CFD Approach

[+] Author and Article Information
C. G. du Toit, P. G. Rousseau

 School of Mechanical Engineering, North-West University, Potchefstroom 2520, South Africa e-mail: Jat.duToit@nwu.ac.za School of Nuclear Science and Engineering, North-West University, Potchefstroom 2520, South Africa e-mail: pgr@mtechindustrial.com

J. Heat Transfer 134(3), 031015 (Jan 18, 2012) (12 pages) doi:10.1115/1.4005152 History: Received August 31, 2010; Revised December 02, 2010; Published January 18, 2012; Online January 18, 2012

Engineers are faced with two major challenges when carrying out the thermal-fluid design of a complex system consisting of many interacting components. The first challenge is to predict the performance of all the individual thermal-fluid components. The second challenge is to predict the performance of the integrated plant consisting of all its subsystems. The complexity associated with the thermal-fluid design of complex systems requires the use of a variety of analysis techniques and simulation tools. These range from simple one-dimensional models that do not capture all the significant physical phenomena, to large-scale three-dimensional computational fluid dynamics (CFD) codes that, for practical reasons, cannot simulate the entire plant as a single integrated model. In the systems CFD approach, a network code serves as the framework to link the models of the various components together and to control the solution. The models of the components can be of varying degrees of complexity. These can range from simple lumped models to complex fully three-dimensional CFD models. This paper gives a brief overview of the systems CFD (SCFD) approach and an overview of the model of the pebble bed nuclear reactor that was developed in the context of the SCFD approach.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Layout of power conversion cycle

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Figure 2

Schematic representation of the SCFD framework

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Figure 3

Network representation of the power plant

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Figure 4

Simplified network representation of the solids in the pebble bed core structures

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Figure 5

Simplified network representation of the riser channel, inlet slots and packed bed flow path within the pebble bed and core structures

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Figure 6

Simplified network representation of the control rod channels within the core structures

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Figure 7

Integrated network representation of the pebble bed and core structures and flow paths

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Figure 8

Results of measured (sana ) and simulated (flownex ) pebble temperatures for Helium with 35 kW nominal heating power

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Figure 9

Results of measured (sana ) and simulated (flownex ) pebble temperatures for Helium with a ramp-down of power input from 30 kW to 10 kW in 50 h

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Figure 10

Comparison between empirical correlations and numerical result

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Figure 11

Average coordination number of HTTF

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Figure 12

Average contact angle in the radial position for the HTTF

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Figure 13

Friction coefficient Ψ as function of Reynolds number Rep

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Figure 14

Multisphere unit cell model

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Figure 15

Comparison of effective thermal conductivity

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