A Review of Void Drift Models in Subchannel Analysis

作     者：Mao, Hu Yang, Bao-Wen Wang, Sipeng 

作者机构：Xi An Jiao Tong Univ Sch Nucl Sci & Technol Sci & Technol Ctr Adv Nucl Fuel Res & Dev Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Collaborat Innovat Ctr High End Mfg Equipment Xianning West Rd 28 Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Qindao Res Inst Qingdao 266300 Peoples R China 

出 版 物：《NUCLEAR SCIENCE AND ENGINEERING》 (Nucl Sci Eng)

年 卷 期：2019年第193卷第1-2期

页      面：33-45页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 

主　　题：Void drift models model improvements intersubchannel mixing two-phase flow 

摘      要：Subchannel analysis is widely used in nuclear reactor core thermal-hydraulic calculation and safety analysis. In subchannel analysis, the axial flow is usually treated as the dominant one-dimensional flow, and the lateral flow is simplified as the intersubchannel interactions and is modeled by introduction of semiempirical source terms or separate models. The accuracy of the subchannel analysis is strongly dependent on the modeling of intersubchannel interactions between adjacent subchannels. The intersubchannel interaction can be decomposed into three components: diversion cross flow that occurs due to imposed transverse pressure gradients, turbulent mixing that occurs due to stochastic pressure and flow fluctuations, and void drift that results from lateral migration of the gaseous phase (void) due to a strong tendency of the two-phase system approaching the equilibrium state of phase distribution. This critical review focuses on void drift research. Both experimental observation of the void drift phenomenon and the proposed void drift models are reviewed. The improvements and corresponding assessments of the void drift models are summarized. Following that, further improvements on the void drift model are proposed.