Study on the characteristics of interfacial waves in annular flow by image analysis

Lin, Ruinan; Wang, Ke; Liu, Li; Zhang, Yongxue; Dong, Sheng

doi:10.1016/j.ces.2019.115336

Cited by 18 publications

(6 citation statements)

References 42 publications

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“…To minimise the issue of the different refractive indices, a transparent square box was used with water filled inside. Schubring et al [41], Lin et al [42,43], Moreira et al [44] and Barbosa et al [45] obtained the liquid-film thickness and disturbance-wave characterization from high-speed imaging. Barbosa et al conducted a series of experiments using a test section with a specially constructed transparent liquid inlet.…”

Section: Visualization and Photographymentioning

confidence: 99%

“…The identification of the flow pattern and the pressure gradient was determined by the characteristics and behaviours of the interfacial wave [42,43], and its orientation has significant impacts on the flow identification and pressure gradient. Pressure drop in a downward co-current annular flow measured by Hajiloo et al [212] suggested that at a fixed gas Reynolds number, a large increase in interfacial friction accompanied a decrease in tube diameter and existing correlations were unsuccessful for the present data.…”

Section: Disturbance Wave Characteristicsmentioning

confidence: 99%

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Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Xue¹,

Stewart

Kelly

et al. 2022

Water

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Two-phase annular flow in vertical pipes is one of the most common and important flow regimes in fluid mechanics, particularly in the field of building drainage systems where discharges to the vertical pipe are random and the flow is unsteady. With the development of experimental techniques and analytical methods, the understanding of the fundamental mechanism of the annular two-phase flow has been significantly advanced, such as liquid film development, evolution of the disturbance wave, and droplet entrainment mechanism. Despite the hundreds of papers published so far, the mechanism of annular flow remains incompletely understood. Therefore, this paper summarizes the research on two-phase annular flow in vertical pipes mainly in the last two decades. The review is mainly divided into two parts, i.e., the investigation methodologies and the advancement of knowledge. Different experimental techniques and numerical simulations are compared to highlight their advantages and challenges. Advanced underpinning physics of the mechanism is summarized in several groups including the wavy liquid film, droplet behaviour, entrainment and void fraction. Challenges and recommendations are summarized based on the literature cited in this review.

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Section: Visualization and Photographymentioning

confidence: 99%

Section: Disturbance Wave Characteristicsmentioning

confidence: 99%

Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Xue¹,

Stewart

Kelly

et al. 2022

Water

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“…For example, annular flow is probably one of the most usual types of two-phase flows in fluid dynamics, particularly in scenarios like refrigeration systems, boiling water reactors (BWRs), and passive safety mechanisms such as passive containment cooling condensers in BWRs and certain types of small modular reactors (SMRs) [2,3]. Annular flow significantly affects heat transfer within these systems [4]. Fluid dynamics of two-phase flow systems refers to the research field that investigates and studies the behavior of two-phase fluids to improve their design and optimize facilities and installation.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the shear stress at the interface can tear off small drops from the crest of these waves, which are then dragged by the core gas flow [6]. In this regime, the liquid film contains small gas bubbles, while the core gas flow drags small droplets previously separated from the liquid film [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Refractive Index Matching Techniques and PLIF40 Measurements in Annular Flow

Rivera,

Bascou,

Blanco

et al. 2024

Sensors

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This paper investigates non-invasive techniques for annular two-phase flow analysis, focusing on liquid film characterization to understand the interfacial phenomena that are crucial for heat and mass transfer. Limited methods allow the study of the temporal and spatial evolution of liquid film, such as Planar Laser-Induced Fluorescence (PLIF). However, this method possesses optical challenges, leading to the need for improved techniques to mitigate refraction and reflection, such as Refractive Index Matching (RIM). This study utilizes an experimental annular flow facility to analyze both RIM and non-RIM PLIF over a range of liquid Reynolds numbers from 4200 to 10,400. Three configurations—PLIF RIM90, PLIF RIM40, and PLIF nRIM40—are compared from both qualitative and quantitative perspectives. In the quantitative analysis, key variables of the liquid film are measured, namely mean film thickness, disturbance wave height, and frequency. Variations in the analyzed variables indicate minor deviations, which are not likely to be caused by the technique used. However, all three methodologies exhibited errors that are estimated to be within a maximum of 10%, with a mean value of approximately 8%.

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“…Necessary and almost complete knowledge of the properties of interfacial waves is of great importance for the mass, momentum, and energy exchange in annular flow. Keeping this in mind, researchers had introduced an image analysis approach based on high-speed photography to analyze the characteristics of interfacial waves in annular flow [22]. It is found that flow pattern identification through this experiment is reliable.…”

Section: Introductionmentioning

confidence: 99%

Interfacial wave propagation in initially stressed compressible hyperelastic materials

Shams

Ejaz

2022

Mathematics and Mechanics of Solids

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In this paper, the propagation of interfacial waves at the joint boundary of two initially stressed compressible half-spaces is discussed. The materials are subject to pure homogeneous strain and the wave is assumed to travel along one of the principle axes. For mathematical formulation of the problem, non-linear theory of elasticity and theory of invariants are used. Boundary conditions at the interface are applied which lead to an implicit secular equation governing the wave speed. A prototype strain-energy function is used for specialized theoretical results to understand the physical behavior of waves at the interface. A special case of biaxial initial stress is considered and the results are presented theoretically and graphically for representative numerical values of parameters. It is observed that the wave speed is considerably affected by intrinsic properties, i.e., material parameters as well as the amount of initial stress.

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Study on the characteristics of interfacial waves in annular flow by image analysis

Cited by 18 publications

References 42 publications

Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Comparison of Refractive Index Matching Techniques and PLIF40 Measurements in Annular Flow

Interfacial wave propagation in initially stressed compressible hyperelastic materials

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