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Indexed by:Journal Papers

Date of Publication:2020-03-01

Journal:ENERGIES

Included Journals:SCIE

Volume:13

Issue:5

Key Words:supercritical water reactor; grid spacer; triangular channel; heat transfer performance

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 kgm(-2)s(-1), and inner wall surface heat fluxes of 200-600 kWm(-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.