Investigation of bubble behaviors in gas-liquid two-phase flow in helically coiled tube based on wire mesh sensor

被引：0
|
作者：
Dai J. [1 ]
Liu L. [2 ]
Liu S. [2 ]
Gu H. [2 ]
Wang K. [1 ]
机构：
[1] College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing
[2] School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 10期
关键词：
bubble; gas-liquid two-phase flow; helically coiled tube; particle size distribution; steam generator; wire mesh sensor;
D O I：
10.11949/0438-1157.20220610
中图分类号：
学科分类号：
摘要：
The heat transfer surface of the nuclear reactor steam generator consists of helical tube bundles. As the spatial spiral structure of the tubes, the slip velocity between phases increases due to the combined effect of gravity, centrifugal force and buoyancy. Accordingly, the distribution of the bubbles in bubbly flow and plug flow shows an asymmetric profile, leading to a significant effect on the heat transfer performance and even the occurrence of departure from nucleate boiling (DNB). In this paper, we employ the developed conductive wire mesh sensor and data post-processing algorithm to investigate the flow field and bubble behaviors in both bubbly and plug flow in a helically coiled tube. Reconstruction of the time and space distribution of the flow field based on the proposed algorithm provides an in-depth knowledge of the characteristics of the bubbles. Based on the present study, the geometric structure of the helically coiled tube can be optimized to avoid heat transfer deterioration, which provides basic experimental data and optimization for the design of the helically coiled tube evaporator. The results indicate that both the increase of the superficial gas velocity and superficial liquid velocity can promote the bubble coalescence. The increase of the gas velocity increases the instability of the gas-liquid interface, and the higher liquid velocity splits the gas plug into several small bubbles in the plug flow. © 2022 Chemical Industry Press. All rights reserved.
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页码：4377 / 4388
页数：11
相关论文
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