Vertical annular flow pattern characterisation using proper orthogonal decomposition of Electrical Impedance Tomography

Polanský, Jiří; Wang, Mi

doi:10.1016/j.flowmeasinst.2018.05.001

Cited by 8 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ε is the noise tolerance, which satisfies the signal decomposition fidelity requirement, and the iteration ends when the equation satisfies equation (10).…”

Section: L({umentioning

confidence: 99%

“…The liquid film thickness parameter is a key factor in the calculation of the pressure drop, void fraction, and interfacial shear parameters [6][7][8][9]. The interface waves between the liquid film and the gas core mainly consist of disturbance waves and ripple waves [8][9][10][11][12], which are affected by interfacial shear and liquid inertia forces [3,6]. Owing to the increase in the gas core density induced by entrainment, the interface shear force increases and the interface wave morphology becomes more complex, which makes it difficult to effectively predict the liquid film thickness.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Liquid film characteristics measurement based on NIR in gas–liquid vertical annular upward flow

Zhao

Wang

Wang³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

Liquid film plays a crucial role in void fraction, friction pressure drops, the momentum and heat transfer in the two-phases flow. The film thickness measurement experiments of annular flow at four pressure conditions have been conducted by near infrared (NIR) sensor. The signal is processed by variational mode decomposition (VMD), of which parameters are optimized by sparrow search algorithm (SSA). Envelope spectrum and Pearson correlation coefficient (PCC) judgment criteria is adopted for signal reconstruction, and the value of liquid film thickness is obtained. The effect (Such as flow rate, pressure, entrainment, etc) of liquid film thickness are analyzed theoretically. The characterization parameters Weg”, Wel, Nμl and Xmod have been extracted and optimized, and then a new average liquid film thickness correlation is proposed. The laboratory results indicate that mean absolute percentage error (MAPE) of the predictive correlation is 4.35% (current data) and 12.02% (literatures’ data) respectively.

show abstract

“…ε is the noise tolerance, which satisfies the signal decomposition fidelity requirement, and the iteration ends when the equation satisfies equation (10).…”

Section: L({umentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid film characteristics measurement based on NIR in gas–liquid vertical annular upward flow

Zhao

Wang

Wang³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Wang et al [85] employed a conductance probe with adjustable insertion depth to measure the film thickness in 2018, and the measurement error was less than 1%. Polansky and Wang [86] applied POD (Proper Orthogonal Decomposition) on a large number of tomograms for the identification of flow patterns in a gas-liquid annular flow. The images were obtained using electrical impedance tomography via a series of electrodes mounted non-intrusively (no induced disturbance to the flow) but invasively (direct contact with the fluid) on the pipe.…”

Section: Conductance Sensormentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…For pipeline transport, ERT can obtain qualitative tomograms reflecting flow regimes and quantitative data that include crosssectional profiles of the distribution of materials or velocities in pipes [25,26]. Applications of ERT to gas-liquid two-phase flow in the petrochemical field are more common in published literature [27][28][29]. ERT is also used to measure solid-liquid two-phase flow; however, most experimental studies take the slurry with concentrations of about 5%-35% solid by volume as research objects [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flow Behavior of Paste Slurry Transported by Gravity in Vertical Pipes

Jian-dong

Wang

et al. 2022

Processes

Self Cite

View full text Add to dashboard Cite

In order to dispose of large quantities of mineral tailings, paste backfill is proposed and widely adopted. Paste backfill, which has high concentration and yield stress and behaves as a non-Newtonian fluid, is prepared at the surface plant and then transported underground. Vertical pipelines are more likely to suffer various failures, such as pipe breaks, wear and plugging, during the transport process. Few present studies focus on the flow behavior of paste slurry flowing in vertical pipes. In this work, two L-shaped pipeline systems with internal diameters (ID) of 40 mm and 65 mm with electrical resistance tomography (ERT) were manufactured to visualize flow regimes and measure the axial velocity and pipe pressure of slurry flowing in the upper and lower zones of vertical pipes. Flow regimes were extracted from ERT-reconstructed images stacked by time-series. Based on this, four typical flow regimes were summarized, and the characteristics of velocity and pressure change with vertical pipe depth were discussed.

show abstract

Vertical annular flow pattern characterisation using proper orthogonal decomposition of Electrical Impedance Tomography

Abstract: This is a repository copy of Vertical annular flow pattern characterisation using proper orthogonal decomposition of Electrical Impedance Tomography.

Cited by 8 publications

References 7 publications

Liquid film characteristics measurement based on NIR in gas–liquid vertical annular upward flow

Liquid film characteristics measurement based on NIR in gas–liquid vertical annular upward flow

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

Experimental Investigation on Flow Behavior of Paste Slurry Transported by Gravity in Vertical Pipes

Contact Info

Product

Resources

About