Experimental study on saturated boiling of two phase natural circulation under low pressure in narrow rectangular channels

An experimental investigation was conducted in a natural circulation (NC) loop to study the characteristics of two-phase flow instability under low pressure condition. A 3 × 3 rod bundle channel was used as the test section. The effects of heating power, inlet subcooling degree and system pressure on the two-phase NC flow instability types and stable boundaries were studied. The experimental results show that three typical flow conditions can occur in rod bundle channel under NC condition, which are single-phase NC flow, subcooled boiling NC flow oscillation and density wave oscillations (DWO). The oscillation amplitude and period of DWO can be enlarged by increasing the heat flux. Increasing the inlet subcooling degree can increase the marginal heating power of flow instability in NC system. The occurrence of DWO can be suppressed by increasing the system pressure. The flow instability boundary presented by the subcooling number and phase change number was also obtained in present work.

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A multi-dimensional dataset for two-phase instability in low pressure natural circulation based on direct transient local measurement

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2020.119447 ◽

2020 ◽

Vol 151 ◽

pp. 119447 ◽

Cited By ~ 1

Author(s):

Taiyang Zhang ◽

Zhiee Jhia Ooi ◽

Maciej Skrzypek ◽

Caleb S. Brooks

Keyword(s):

Natural Circulation ◽

Low Pressure ◽

Local Measurement ◽

Two Phase ◽

Phase Instability

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1205 An Experimental Study of Two-Phase Natural Circulation System Cooling a Pin Type Finned Heating Surface

The Proceedings of Conference of Kansai Branch ◽

10.1299/jsmekansai.2005.80._12-9_ ◽

2005 ◽

Vol 2005.80 (0) ◽

pp. _12-9_-_12-10_

Author(s):

Mitsunari MASAKA ◽

Hiroaki KUTSUNA ◽

Yoshiki NOGUCHI ◽

Yoichi SHIOMI ◽

Shigeyasu NAKANISHI

Keyword(s):

Experimental Study ◽

Natural Circulation ◽

Heating Surface ◽

Circulation System ◽

Two Phase

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Theoretical and experimental study on density wave oscillation of two-phase natural circulation of low equilibrium quality

Nuclear Engineering and Design ◽

10.1016/s0029-5493(01)00456-3 ◽

2002 ◽

Vol 215 (3) ◽

pp. 187-198 ◽

Cited By ~ 45

Author(s):

Su Guanghui ◽

Jia Dounan ◽

Kenji Fukuda ◽

Guo Yujun

Keyword(s):

Experimental Study ◽

Natural Circulation ◽

Density Wave ◽

Two Phase ◽

Wave Oscillation

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Chaotic oscillations in a low pressure two-phase natural circulation loop under low power and high inlet subcooling conditions

Nuclear Engineering and Design ◽

10.1016/0029-5493(95)01127-7 ◽

1996 ◽

Vol 162 (2-3) ◽

pp. 223-232 ◽

Cited By ~ 29

Author(s):

C.Y. Wu ◽

S.B. Wang ◽

Chin Pan

Keyword(s):

Low Power ◽

Natural Circulation ◽

Low Pressure ◽

Circulation Loop ◽

Chaotic Oscillations ◽

Two Phase ◽

Natural Circulation Loop

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An experimental study of two-phase flow instability in a multi-loop natural circulation system

Annals of Nuclear Energy ◽

10.1016/j.anucene.2019.107269 ◽

2020 ◽

Vol 139 ◽

pp. 107269

Author(s):

Zahraddeen Abbati ◽

Jiarui Chen ◽

Kun Cheng ◽

Fulong Zhao ◽

Fenglei Niu ◽

...

Keyword(s):

Experimental Study ◽

Two Phase Flow ◽

Flow Instability ◽

Natural Circulation ◽

Circulation System ◽

Phase Flow ◽

Two Phase

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Advanced Natural Circulation Reduced Order Model With Inclined Channel for Low Pressure Conditions

Volume 6A: Thermal-Hydraulics and Safety Analyses ◽

10.1115/icone26-81238 ◽

2018 ◽

Author(s):

René Manthey ◽

Alexander Knospe ◽

Carsten Lange ◽

Christoph Schuster ◽

Antonio Hurtado

Keyword(s):

Reference Model ◽

Nonlinear Dynamical Systems ◽

Natural Circulation ◽

Dynamical Behavior ◽

Low Pressure ◽

Reduced Order Model ◽

Circulation System ◽

Order Model ◽

Two Phase ◽

Reduced Order

Natural circulation with two-phase flow is a nonlinear dynamical systems, which can show a very complex and strange behavior under specific conditions. The application of stability analysis requires a large computational effort and is cumbersome in case of prediction the dynamical behavior by system codes alone. Therefore, model order reduction techniques are used to compensate this disadvantage by coupling with a bifurcation code such as MatCont. A reduced order model is derived by employing the POD-method to analyze the stability landscape of a low pressure natural circulation system representing passive safety systems such as the containment cooling condenser. The required full order model contains a classical natural circulation loop with a heated section and a riser. The two-phase region is modeled by a drift-flux mixture model. The reliability of the FOM is investigated by comparison with a reference model by the validated system code ATHLET.

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