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Flow Visualization in the Scaled Up Pebble Bed of High Temperature Gas-Cooled Reactor Using Particle Image Velocimetry Method

[+] Author and Article Information
Jae-Young Lee

School of Mechanical and Control System Engineering, Handong Global University, Pohang, Gyeongbuk 791-708, Koreajylee7@handong.edu

Sa-Ya Lee

School of Mechanical and Control System Engineering, Handong Global University, Pohang, Gyeongbuk 791-708, Koreasayalee@seed.handong.edu

J. Eng. Gas Turbines Power 131(6), 064502 (Jul 17, 2009) (4 pages) doi:10.1115/1.3098417 History: Received November 26, 2008; Revised December 01, 2008; Published July 17, 2009

The flow visualization in the complicated flow geometry of the pebble bed of the high temperature gas-cooled reactor is investigated to identify the stagnation points at which internal hot spots are expected. A particle image velocimetry method was employed to visualize flow for the pebble bed in the structure of the face centered cubic. The wind tunnel was designed to provide the same Reynolds number of 2.1614×104 as the pebble bed nuclear reactor. Scaling law determined the diameter of the pebble as 120 mm, which is two times bigger than the reference when we use air as a coolant rather than helium. The present scaled up design reduces the load of high speed imaged acquisition and the flow field measured by 4000 frames/s. It was found that the present method identified flow field successfully, including the stagnation points suspected to produce hot spots on the surface of the pebble bed. The present data are useful in evaluating the three-dimensional computational fluid dynamics analysis.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of the pebble bed test section in the fcc stack geometry: (a) test section configuration and (b) pebbles stacked in the face-centered-cubic stacked pebbles

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Figure 2

Picture of the wind tunnel with the test section and the PIV system

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Figure 3

Velocity vector field in the gap of pebble: (a) velocity vectors and (b) the representative points of velocity near the wall

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Figure 4

The speed (vx2+vy2) of the cooling gas at the representative points indicated in Fig. 3

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