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

作     者：GU Hanyang YU Yiqi CHENG Xu LIU Xiaojing 

作者机构：School of Nuclear Science and Engineering Shanghai Jiaotong University Shanghai 200240 China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2008年第19卷第3期

页      面：178-186页

核心收录：

学科分类：08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Basic Research Program of China (No. 2007CB209804) 

主　　题：传热理论 热转换 数字分析 水力行为 

摘      要：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.