Numerical study of transient flow characteristics of gas-liquid two-phase flow in inclined upward tube under periodic vibration

Wang, Lin; Zhang, Yao; Bao, Yangyang; Ma, Tingxia

doi:10.1016/j.oceaneng.2023.115024

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…Liquid nitrogen boiling begins at the inlet section of the cooling loop, forming a bubbly flow. Subsequently, during the secondary heating process in the cooling loop, the gas volume fraction gradually increases, forming slug flow [23] in the cooling loop of the first crystal.…”

Section: Gas-liquid Two-phase Flow Simulationmentioning

confidence: 99%

Research on the Mechanism of Flow-Induced Vibration in the Cooling System of a Double Crystal Monochromator

Li,

Gong,

Bai

et al. 2024

Applied Sciences

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To investigate the mechanism of flow-induced vibrations in the cooling system of a double crystal monochromator (DCM), this paper utilizes a multi-physics numerical simulation approach, employing ANSYS and FLUENT platforms to simulate the flow state of liquid nitrogen in the cooling system and explore the amplitude response of the DCM. Initially, simulations were conducted to examine the flow state of liquid nitrogen with varying frequency and amplitude pulsations. Subsequently, modal analysis was employed to investigate the amplitude response of the DCM in the pitch direction vibrations under pulsating excitation. Finally, this research investigated the influence of high heat load-induced liquid nitrogen boiling on a DCM. The results indicate that pipe resistance is the fundamental cause of vibration induced by pulsating excitation. Low-frequency excitation enhances the amplification factor of DCM vibration. In contrast, due to the rapid conversion of fluid kinetic energy to pressure potential energy, high-frequency excitation increases the pulsation amplitude in the pipe. Additionally, there is a linear relationship between the amplitude of liquid nitrogen velocity fluctuations and the response amplitude of a DCM. The slug flow formed after liquid nitrogen boiling generates low-frequency pulse signals, and intermittent fluid impacts cause significant vibrations in the DCM. These research findings provide a reference for the analysis and design of ultra-high-stability DCM cooling systems.

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Section: Gas-liquid Two-phase Flow Simulationmentioning

confidence: 99%

Research on the Mechanism of Flow-Induced Vibration in the Cooling System of a Double Crystal Monochromator

Li,

Gong,

Bai

et al. 2024

Applied Sciences

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“…The Bayesian method has gained prominence in reliability assessment due to its effective use of historical and real-time observational data. This method's primary strength is its capacity to manage uncertainty, enhancing the precision of reliability estimates by incorporating new data into existing prior information [54][55][56][57]. Consequently, it is frequently used to estimate unknown parameters in degradation models, particularly when these parameters exhibit complex distributions or are not directly measurable [58].…”

Section: Introductionmentioning

confidence: 99%

Bayesian Fusion of Degradation and Failure Time Data for Reliability Assessment of Industrial Equipment Considering Individual Differences

Fu,

Zhang,

et al. 2024

Processes

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In the field of industrial equipment reliability assessment, dependency on either degradation or failure time data is common. However, practical applications often reveal that single-type reliability data for certain industrial equipment are insufficient for a comprehensive assessment. This paper introduces a Bayesian-fusion-based methodology to enhance the reliability assessment of industrial equipment. Operating within the hierarchical Bayesian framework, the method innovatively combines the Wiener process with available degradation and failure time data. It further integrates a random effects model to capture individual differences among equipment units. The robustness and applicability of this proposed method are substantiated through an in-depth case study analysis.

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Two-phase slug flow control using baffle in a vessel-type slug catcher: a CFD simulation study

Rezvandehi,

Ansari,

Moayedi

2023

J Braz. Soc. Mech. Sci. Eng.

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Numerical study of transient flow characteristics of gas-liquid two-phase flow in inclined upward tube under periodic vibration

Cited by 4 publications

References 41 publications

Research on the Mechanism of Flow-Induced Vibration in the Cooling System of a Double Crystal Monochromator

Research on the Mechanism of Flow-Induced Vibration in the Cooling System of a Double Crystal Monochromator

Bayesian Fusion of Degradation and Failure Time Data for Reliability Assessment of Industrial Equipment Considering Individual Differences

Two-phase slug flow control using baffle in a vessel-type slug catcher: a CFD simulation study

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