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Research Papers: Nuclear Power

An Experimental Study on Air-Water Two-Phase Flow Patterns in Pebble Beds

[+] Author and Article Information
Bai Bofeng, Liu Maolong, Su Wang, Zhang Xiaojie

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

J. Eng. Gas Turbines Power 132(4), 042903 (Jan 27, 2010) (5 pages) doi:10.1115/1.4000337 History: Received July 17, 2009; Revised August 07, 2009; Published January 27, 2010; Online January 27, 2010

An experimental study was conducted on the air-water two-phase flow patterns in the bed of rectangular cross sections containing spheres of regular distribution. Three kinds of glass spheres with different diameters (3 mm, 6 mm, and 8 mm) were used for the establishment of the test section. By means of visual observations of the two-phase flow through the test section, it was discovered that five different flow patterns occurred within the experimental parameter ranges, namely, bubbly flow, bubbly-slug flow, slug flow, slug-annular flow, and annular flow. A correlation for the bubble and slug diameter in the packed beds was proposed, which was an extended expression of the Tung/Dhir model, Jamialahmadi’s model, and Schmidt’s model. Three correlations were proposed to calculate the void friction of the flow pattern transition in bubble flow, slug flow, and annular flow based on the bubble model in the pore region. The experimental result showed that the modified Tung and Dhir model of the flow pattern transition was in better agreement with the experimental data compared with Tung and Dhir’s model.

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Figures

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Figure 1

Schematic diagram of the experimental apparatus for coflow studies

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Figure 2

Bubbly flow in the pebble beds composed of 8 mm diameter particles

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Figure 3

Bubbly-slug flow in the pebble beds composed of 8 mm and 6 mm diameter particles

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Figure 4

Slug flow in the pebble beds composed of 8 mm, 6 mm, and 3 mm diameter particles

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Figure 5

Slug-annular flow in the pebble beds composed of 8 mm, 6 mm, and 3 mm diameter particles

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Figure 6

Annular flow in the pebble beds composed of 8 mm, 6 mm, and 3 mm diameter particles

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Figure 7

Bubble model in the pore region

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Figure 8

Flow pattern map of the modified Tung/Dhir model

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