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Numerical analysis of thermal-hydraulic behavior of supercritical water in vertical upward/downward flow channels

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Numerical analysis of thermal-hydraulic behavior of supercritical water in vertical upward/downward flow channels

GU Hanyang，
YU Yiqi，
CHENG Xu，
LIU Xiaojing
Nuclear Science and TechniquesVol.19, No.3pp.178-186Published in print 20 Jun 2008
DOI：10.1016/S1001-8042(08)60047-0
CLC：TL331
45100

Investigations on the thermal-hydraulic behavior in the SCWR fuel assembly have obtained a significant attention in the international SCWR community. However, there is still a lack of understanding of the heat transfer behavior of supercritical fluids. In this paper, the numerical analysis is carried out to study the thermal-hydraulic behaviour in vertical sub-channels cooled by supercritical water. Remarkable differences in characteristics of secondary flow are found, especially in square lattice, between the upward flow and downward flow. The turbulence mixing across sub-channel gap for downward flow is much stronger than that for upward flow in wide lattice when the bulk temperature is lower than pseudo-critical point temperature. For downward flow, heat transfer deterioration phenomenon is suppressed with respect to the case of upward flow at the same conditions.

Supercritical water reactorCFDHeat transfer
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