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Date of Publication:2018-01-01

Journal:哈尔滨工程大学学报

Volume:39

Issue:8

Page Number:1290-1295

ISSN No.:1006-7043

Abstract:Using the commercial software package CFX, a numerical simulation was carried out to investigate the entropy generation in turbulent convection heat transfers within a hexagonal inner sub-channel of a supercritical water-cooled reactor (SCWR). The SSG Reynolds stress model with enhanced wall treatment was used as a turbulence model to increase precision of the near-wall numerical simulation. The simulation results show that the flow of the buffer layer in the vicinity of pseudo-critical temperature may intensify the circumferential local heat transfer, and both the viscous sub-layer and buffer layer significantly affect entropy generation with respect to the circumferential heterogeneity, and the buffer layer is sensitive to the entropy generation variations. The entropy generation in the narrow gap is relatively larger than that in the sub-channel center, and heat transfer contributes more than energy dissipation towards entropy generation. Near the pseudo-critical point temperature, the circumferential difference of entropy generation decreases. The findings can provide a theoretical direction for the conceptual design of SCWR. © 2018, Editorial Department of Journal of HEU. All right reserved.

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