Investigation on pressure drop and characteristics of flow-pattern transition of steam-water two-phase flows in helically coiled tubes

被引：0

作者：

Chen, Kexin ^{[1
]}

Li, Xi ^{[1
]}

Chang, Fucheng ^{[1
]}

Wu, Xiaoyi ^{[1
]}

Lou, Jiacheng ^{[1
]}

Li, Huixiong ^{[1
]}

机构：

[1] State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2025年 / 44卷 / 02期

关键词：

frictional pressure drop; gas-liquid flow; helically coiled tube; interface; numerical simulation;

D O I：

10.16085/j.issn.1000-6613.2024-0122

中图分类号：

学科分类号：

摘要：

Helically coiled tube (HCT) steam generators are widely used in chemical engineering, aerospace industry and nuclear engineering, etc., and especially, in small modular nuclear reactors because of their high heat transfer efficiency, compact structure and free thermal expansion behavior. The special geometry of the HCT leads to complex flow characteristics such as secondary flows and the resulting special phase distribution and flow patterns in the tube and relatively high pressure drop compared to that in straight tubes. The difference of geometrical parameters usually leads to the significant difference in the characteristics of gas-liquid flow in HCTs. In the present study, the pressure drop and flow-pattern transition characteristics of subcritical pressure water-steam two-phase flow in an HCT with a special small tube diameter were investigated by experiments and numerical simulations. It can be concluded that the frictional pressure drop firstly increased with the increase in thermal equilibrium quality, and reached a peak at the quality of 0.75, and then decreased gradually. This was due to the flow regime transforms from annular flow to dispersed flow (or mist flow) when the quality equaled to 0.75, which led to the reduction of frictional pressure drop. The flow regimes of high-pressure steam-water two-phase flow in HCTs can be divided into bubble flow, intermittent flow, annular flow and dispersed flow (or mist flow). The transition criteria between bubble flow and intermittent flow was at the quality of 0.038, the transition criteria between intermittent flow and annular flow was at the quality of 0.500, the transition criteria between annular flow and dispersed flow (or mist flow) was at the quality of 0.751, and the dry-out point was at the quality of 0.93. This study can provide guidance for the design and safe operation of HCT steam generators. © 2025 Chemical Industry Press Co., Ltd.. All rights reserved.

引用

页码：613 / 624

页数：11

共 36 条

[1]

SEBAN R A, MCLAUGHLIN E F., Heat transfer in tube coils with laminar and turbulent flow, International Journal of Heat and Mass Transfer, 6, 5, pp. 387-395, (1963)

[2]

OWHADI Ali, BELL Kenneth J, CRAIN Berry, Forced convection boiling inside helically-coiled tubes, International Journal of Heat and Mass Transfer, 11, 12, pp. 1779-1793, (1968)

[3]

CORONEL Pablo, SANDEEP K P., Heat transfer coefficient in helical heat exchangers under turbulent flow conditions, International Journal of Food Engineering, 4, 1, (2008)

[4]

FSADNI Andrew Michael, WHITTY Justin P M., A review on the two-phase heat transfer characteristics in helically coiled tube heat exchangers, International Journal of Heat and Mass Transfer, 95, pp. 551-565, (2016)

[5]

FSADNI Andrew Michael, WHITTY Justin P M., A review on the two-phase pressure drop characteristics in helically coiled tubes, Applied Thermal Engineering, 103, pp. 616-638, (2016)

[6]

ONAL Busra Selenay, KIRKAR Safak Metin, Dogan AKGUL, Et al., Heat transfer and pressure drop characteristics of two phase flow in helical coils, Thermal Science and Engineering Progress, 27, (2022)

[7]

GUO Liejin, FENG Ziping, CHEN Xuejun, An experimental investigation of the frictional pressure drop of steam-water two-phase flow in helical coils, International Journal of Heat and Mass Transfer, 44, 14, pp. 2601-2610, (2001)

[8]

ZHAO Liang, GUO Liejin, BAI Bofeng, Et al., Convective boiling heat transfer and two-phase flow characteristics inside a small horizontal helically coiled tubing once-through steam generator, International Journal of Heat and Mass Transfer, 46, 25, pp. 4779-4788, (2003)

[9]

MAO Yufei, GUO Liejin, ZHEN Feiqiang, Et al., Experimental investigation of frictional resistance for steam-water two-phase flow in helical coils, Journal of Engineering Thermophysics, 31, 3, pp. 443-446, (2010)

[10]

HARDIK B K, PRABHU S V., Boiling pressure drop and local heat transfer distribution of helical coils with water at low pressure, International Journal of Thermal Sciences, 114, pp. 44-63, (2017)

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