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Research Papers

Numerical Analysis on Heat-Transfer Deterioration of Supercritical Fluid in the Vertical Upward Tubes

[+] Author and Article Information
Xianliang Lei

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University,
No. 28 Xianning West Road, Xi’an, Shaanxi 710049, China
e-mail: xianlianglei@mail.xjtu.edu.cn

Huixiong Li

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University,
No. 28 Xianning West Road, Xi’an, Shaanxi 710049, China
e-mail: huixiong@mail.xjtu.edu.cn

Weiqiang Zhang

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University,
No. 28 Xianning West Road, Xi’an, Shaanxi 710049, China
e-mail: wuxinzhimu.01@stu.xjtu.edu.cn

1Corresponding author.

Manuscript received May 30, 2015; final manuscript received February 4, 2016; published online June 17, 2016. Assoc. Editor: Thomas Schulenberg.

ASME J of Nuclear Rad Sci 2(3), 031017 (Jun 17, 2016) (8 pages) Paper No: NERS-15-1105; doi: 10.1115/1.4032872 History: Received May 30, 2015; Accepted February 11, 2016

Heat-transfer characteristics are especially significant among all issues for the supercritical water-cooled reactors (SCWRs). The two-peak wall-temperature phenomenon that could be verified by Shitsman and Jackson’s experiments occurred in the regions of tb<tpc<tw for vertical upward flow under the extreme heating conditions or accident cases (i.e., q/G>0.6  kJ/kg for water). However, so far the special two-peak result has not been paid much attention due to the difficulty of the experiments. Hence, in this study, numerical analysis was carried out to investigate the characteristics of heat-transfer deterioration (HTD) two-peak phenomenon of supercritical pressure water/carbon dioxide in the conditions of high q/G. The results showed that the higher the heat fluxes were, the more temperature peaks might appear and more unstable flow might be presented. Finally, the mechanism of two-peak HTD was studied through quantitatively analyzing the distribution of flow parameters and thermophysical properties in the near-wall region.

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References

Figures

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Fig. 1

Experimental result of heat-transfer deterioration in vertical tube deriving from Shitsman [8]

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Fig. 2

Experimental result of HTD with (a) one or (b) two temperature peaks deriving from Jackson [11]

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Fig. 3

Calculated model used in this paper

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Fig. 4

Meshes of the vertical upward tube model

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Fig. 5

Comparison of experimental data with different turbulent model

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Fig. 6

Effect of the turbulent Prandtl number

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Fig. 7

Effect of heat fluxes at the condition of 25 MPa, 510  kg m−2 s−1

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Fig. 8

Effect of mass fluxes at the condition of 25 MPa, 700  kW m−2

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Fig. 9

Variation of temperature and contours of temperature, velocity, turbulent kinetic energy, and density at different heat fluxes: (a) q=100  kW m−2, (b) q=250  kW m−2, and (c) q=300  kW m−2

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Fig. 10

Different parameters distribution at various locations, such as (a) temperature, (b) velocity, (c) turbulent kinetic energy, and (d) density

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