One-dimensional drift-flux correlation for vertical upward two-phase flow in large size concentric and eccentric annuli

被引:11
作者
Zhao, Quanbin [1 ]
Hibiki, Takashi [2 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
[2] Purdue Univ, Sch Nucl Engn, 400 Cent Dr, W Lafayette, IN 47907 USA
基金
中国博士后科学基金;
关键词
Drift-flux model; Void fraction; Holdup; Large annulus; Two-phase flow; MODEL; SLUG;
D O I
10.1016/j.ijmultiphaseflow.2018.12.016
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In view of the practical importance of predicting void fraction in two-phase flow, a correlation based on the drift-flux model is often utilized in many industrial fields. To use the drift-flux type correlation, two drift-flux parameters such as distribution parameter and void fraction weighted mean drift velocity should be modeled accurately. Since the drift-flux parameters are susceptible to channel size, they are modeled differently depending on whether the channel size is characterized as small (or mini), medium or large. Although drift-flux type correlations with modeled distribution parameter and drift velocity for medium size channels with various geometries have been well-developed, limited drift-flux correlations are available for large size channels. Two-phase flow characteristics in a large size channel are quite different from those in a medium size channel at low flow conditions. Large slug bubbles observed in a medium size channel do not form in a large size channel due to the presence of surface instability. As large slug bubbles disintegrate into smaller cap bubbles, the drift velocity is increased. Complex two-phase flow characteristics in a large size channel also affect the distribution parameter. This study successfully models the distribution parameter and drift velocity for two-phase flow in a vertical concentric annulus. The drift-flux correlation with modeled distribution parameter and drift velocity is validated by existing data taken in large size annuli. The applicability of the drift-flux correlation to two-phase flow in a vertical eccentric annulus is also examined by existing data. (C) 2018 Elsevier Ltd. All rights reserved.
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页码:33 / 44
页数:12
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