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Research Papers: Nuclear Power

Photographic Study on Two-Phase Flow Patterns of Water in a Single-Side Heated Narrow Rectangular Channel

[+] Author and Article Information
Junfeng Wang, Yanlin Wang

Key Laboratory of Bubble Physics and Natural Circulation, Nuclear Power Institute of China, Chengdu, Sichuan 610041, China

Yanping Huang1

Key Laboratory of Bubble Physics and Natural Circulation, Nuclear Power Institute of China, Chengdu, Sichuan 610041, Chinahypgroup@163.com

1

Corresponding author.

J. Eng. Gas Turbines Power 133(5), 052907 (Dec 13, 2010) (5 pages) doi:10.1115/1.4002406 History: Received July 02, 2010; Revised July 03, 2010; Published December 13, 2010; Online December 13, 2010

Visualized experimental observation on flow patterns during flow boiling of water under single-side heated and fluid-inlet subcooled conditions in a vertical narrow rectangular channel with the cross section of 40×3mm2 have been carried out. Four discernible flow patterns, which names dispersed bubbly, coalesced bubbly, churn flow, and annular flow are observed. Flow visualization in two dimensions of two-phase flow patterns for narrow rectangular channel, which provided clearer evidence to distinguish flow patterns, have been performed. Based on the experimental results, a flow pattern map for single-side heated narrow rectangular channel has been developed and then compared with the exiting maps and flow transition criteria.

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Figures

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Figure 1

Schematic diagram of the experimental setup

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Figure 2

Profile schematic diagram of test specimen

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Figure 3

Photographs of flow patterns in single-side heated narrow rectangular channel: (a) dispersed bubbly, (b) coalesced bubbly, (c) churn flow, and (d) annular flow

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Figure 4

Schematic diagrams of flow patterns in single-side heated narrow rectangular channel: (a) dispersed bubbly, (b) coalesced bubbly, (c) churn flow, and (d) annular flow

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Figure 5

Flow pattern map for single-side heated narrow rectangular channel

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Figure 6

Comparison of the present data with the existing air-water flow pattern maps

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Figure 7

Comparison of the present data with the existing steam-water flow pattern map

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Figure 8

Comparison of flow pattern map with existing flow regime transition criteria

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