Experimental Investigation on Heat Transfer of Supercritical Water Flowing in the Subchannel with Grid Spacer in Supercritical Water-Cooled Reactor

Weishu Wang, Lingwei Guo, Ge Zhu, Xiaojing Zhu and Qincheng Bi
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Weishu Wang: School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450000, China
Lingwei Guo: School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450000, China
Xiaojing Zhu: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Qincheng Bi: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2020, vol. 13, issue 5, 1-17

Abstract: Experimental investigations on the heat transfer performance of supercritical water flowing in the subchannel of supercritical water-cooled reactor (SCWR) simulated by a triangular channel were conducted at pressures of 23–28 MPa, mass flow rates of 700–1300 kg·m −2 ·s −1 , and inner wall surface heat fluxes of 200–600 kW·m −2 . An 8 mm diameter fuel rod with a 1.4 pitch to diameter ratio was used. The effects of pressure, mass flow rate, and heat flux on the heat transfer performance under the resistance of a standard grid spacer were analyzed. Experimental results showed the significant positive influence of the grid spacer on the supercritical water in the subchannel. Moreover, in the presence of the grid spacer, the parameters influenced the heat transfer with different degrees of strengthening reaction. In view of the phenomenon in the tests, the rule of the supercritical heat transfer was further revealed by the comparison between empirical formulas and experimental data. This paper mainly studied the positioning grid function and the fluid flow characteristics downstream of the subchannel under the influence of the standard grid spacer and the impact mechanism of each parameter on the whole heat transfer process coefficient.

Keywords: supercritical water reactor; grid spacer; triangular channel; heat transfer performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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