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Research Papers

An Experiment of Natural Circulation Flow and Heat Transfer With Supercritical Water in Parallel Channels

[+] Author and Article Information
Yuzhou Chen

China Institute of Atomic Energy,
P.O. Box 275(59), Beijing 102413, China
e-mail: chenyz@ciae.ac.cn

Chunsheng Yang

China Institute of Atomic Energy,
P.O. Box 275(59), Beijing 102413, China
e-mail: ycs8888205@sohu.com

Minfu Zhao

China Institute of Atomic Energy,
P.O. Box 275(59), Beijing 102413, China
e-mail: zhaominfu@163.com

Keming Bi

China Institute of Atomic Energy,
P.O. Box 275(59), Beijing 102413, China
e-mail: bikeming@126.com

Kaiwen Du

China Institute of Atomic Energy,
P.O. Box 275(59), Beijing 102413, China
kwdu@ciae.ac.cn

Manuscript received May 12, 2015; final manuscript received January 13, 2016; published online June 17, 2016. Assoc. Editor: Thomas Schulenberg.

ASME J of Nuclear Rad Sci 2(3), 031013 (Jun 17, 2016) (7 pages) Paper No: NERS-15-1084; doi: 10.1115/1.4032779 History: Received May 12, 2015; Accepted January 22, 2016

An experiment of natural circulation of supercritical water in parallel channels was performed in bare tubes of inner diameter 7.98 mm and heated length 1.3 m, covering the ranges of pressure of 24.7–25.5 MPa, mass flux of 4001000  kg/m2s, and heat flux of up to 1.83  MW/m2. When the heat flux reached 1.12  MW/m2, the outlet water temperature jumped from 325°C to 360°C, associated with a decrease in the flow rate and an initiation of dynamic instability. When the heat flux exceeded 1.39  MW/m2, the flow instability was stronger, and the flow rate increased in one channel and decreased in another one. Until the heat flux reached 1.61  MW/m2, the outlet water temperatures of two channels reached the pseudocritical point, and the flow rates of two channels tended to close each other. The experiment with a single heated channel was also performed for comparison. The measurements on the heat-transfer coefficients (HTCs) were compared to the calculations by the Bishop et al., Jackson’s, and Mokry et al. correlations, showing different agreements within various conditions.

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Figures

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Fig. 1

Schematic diagram of natural circulation loop: 1, piston pump; 2, pressurizer; 3, heat exchanger; 4, thermal insulation; 5, test section

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Fig. 2

Variations of the inlet and outlet water temperatures of two parallel channels with heat fluxes

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Fig. 3

Variations of the outlet water temperatures of two parallel channels with time

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Fig. 4

Variations of the mass fluxes of two parallel channels with time

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Fig. 5

Variations of the inner-surface temperatures of different locations with heat fluxes: (a) channel 1 and (b) channel 2

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Fig. 6

Variations of the inner-surface temperatures T1,3 and T2,3 with time

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Fig. 7

Variations of the HTCs of different locations with heat fluxes for channel 1

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Fig. 8

Variations of the outlet water temperature and inner-surface temperatures with heat fluxes for single heated channel

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Fig. 9

Variations of the mass flux with heat fluxes for single heated channel

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Fig. 12

Comparison of the Mokry et al. correlation with the present experimental results before the dynamic instability

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Fig. 11

Comparison of the Jackson’s correlation with the present experimental results before the dynamic instability

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Fig. 10

Comparison of the Bishop et al. correlation with the present experimental results before the dynamic instability

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