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Research Papers: Nuclear Power

Gas Flow Simulations in Randomly Distributed Pebbles

[+] Author and Article Information
Xiang Zhao

School of Engineering and Technology, Alabama A&M University, 4900 Meridian Street, Huntsville, AL 35762xiang.zhao@aamu.edu

Trent Montgomery

School of Engineering and Technology, Alabama A&M University, 4900 Meridian Street, Huntsville, AL 35762trent.montgomery@aamu.edu

Sijun Zhang

 ESI CFD, Inc., 6767 Old Madison Pike, Suite 600, Huntsville, AL 35806sijun.zhang@esi-group-na.com

J. Eng. Gas Turbines Power 133(5), 052913 (Dec 21, 2010) (8 pages) doi:10.1115/1.4002833 History: Received July 16, 2010; Revised July 16, 2010; Published December 21, 2010; Online December 21, 2010

In this paper, computational fluid dynamics (CFD) gas flow simulations are carried out for the pebble bed reactor. In CFD calculations, geometry modeling and physical modeling are crucial to CFD results. The effects of the treatments of the interpebble contacts on gas flow fields and heat transfer are examined. A sensitivity analysis for the gap size is conducted with two spherical pebbles, in which the interpebble region is modeled by means of two types of interpebble gap and two kinds of direct contact. Both large eddy simulation and Reynolds-averaged Navier–Stokes models are employed to investigate the turbulent effects. It is found that the flow fields and relevant heat transfer are significantly dependent on the modeling of the interpebble region. The calculations indicate the complex flow structures present within the voids between the fuel pebbles.

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Figures

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Figure 1

Unstructured control volume

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Figure 2

Geometry for two-sphere cases

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Figure 3

The pressure contours on the surface of the spheres and the plane of Z=0 (midplane)

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Figure 4

The X-component velocity contours on the surface of spheres and the plane of Z=0 (midplane)

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Figure 5

The temperature contours on the surface of the spheres and the plane of Z=0 (midplane)

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Figure 6

The pressure contours on the front-surface and back-surface of the spheres

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Figure 7

The temperature contours on the front-surface and back-surface of the spheres

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Figure 8

Model geometries from the front view and the angle view

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Figure 9

The pressure contours on the plane of X=0 (midplane)

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Figure 10

The velocity vectors on the plane of Z=0 (midplane)

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Figure 11

The velocity vectors on the plane of Y=0 (midplane)

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Figure 12

The isosurface of vorticity

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