Interfacial wave analysis of low viscous oil-water flow in upwardly inclined pipes

Perera, Kshanthi; Time, Rune W.; Pradeep, Chaminda; Kumara, Amaranath S.

doi:10.1016/j.ces.2018.11.014

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…The electromagnetic method has yet to be studied for high water holdup and low-rate oil-water two-phase flow [28]. Separation methods mainly include the partial separation method [29], [30] and the full separation method [31], [32]. In the partial separation method, the equipment volume is significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

New Measurement Method of Oil-Water Two-Phase Flow with High Water Holdup and Low Rate by Phase State Regulation

Han,

Chen,

Liu

et al. 2023

Measurement Science Review

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Flow rate and holdup are two essential parameters to describe oil-water two-phase flow. The distribution of oil-water two-phase flow in the pipeline is very uneven, and there is a significant slippage between the phases. This makes it difficult to measure these two flow parameters. In this paper, a new measurement method of flow rate and holdup based on phase state regulation is proposed. The oil-water two-phase flow is adjusted to oil or water single-phase flow according to the time sequence by the phase state regulation, and the oil-water phase interface is measured with a conductance sensor. A wavelet transform based phase inflection point detection model is proposed to detect the oil-water phase change point. The experimental results show that the maximum measurement error of the flow rate of water is 3.73%, the maximum measurement error of the flow rate of oil is 3.68%, and the flow rate measurement repeatability is 0.0002. The accuracy of the measurement holdup is better than 3.23%, and the repeatability of the measurement holdup is 0.0003. The prototype designed based on this method has two advantages. One is that it is small in size, the other is that it does not depend on the accuracy of the sensor. Therefore, it can be widely used in oilfield ground measurement.

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Section: Introductionmentioning

confidence: 99%

New Measurement Method of Oil-Water Two-Phase Flow with High Water Holdup and Low Rate by Phase State Regulation

Han,

Chen,

Liu

et al. 2023

Measurement Science Review

View full text Add to dashboard Cite

show abstract

“…Generally, the horizontal and inclined oil-water flow patterns show obvious diversity and instability, and the mechanism of the flow pattern transition is complicated. The interfacial wave characteristics of ST flow were remarkably associated with the transition between the stratified to non-stratified flow [10][11][12]. Angeli et al [13] measured the interfacial wave amplitude and wavelength with a parallel-wire conductivity probe and proposed that the waves have to reach a certain amplitude before droplets can detach from their crests.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Interfacial Characteristics of Horizontal and Inclined Oil–Water Flows by Using Wire-Mesh Sensor

et al. 2022

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Oil–water flows are widely encountered in petroleum, chemical, nuclear reactors, and other crucial industrial processes. Due to gravity and interaction between phases, horizontal and inclined oil–water two-phase flows are characterized by remarkable multi-scale structure characteristics, such as large-scale stratified interface and small-scale droplets entrainment. Moreover, a slight change in the pipe inclination will lead to significant changes in the local oil–water flow structures, which results in great challenges in the measurement of the interface structures. In this study, we design a 10 × 10 conductance wire-mesh sensor (WMS) to detect the interfacial characteristics of horizontal and inclined oil–water flows. Firstly, we carry out horizontal and inclined oil–water flow experiments. The influence of pipe inclinations on the flow transition boundary is analyzed. The three-dimensional (3D) structures of oil–water flows are visualized based on the WMS measurement response. Then, edge detection is implemented to process the two-dimensional (2D) flow images visualized by the WMS. The influence of complexly distributed droplets is effectively removed by using binary image morphological transformation and watershed algorithm, and thus, oil–water interface structures are accurately extracted. Finally, the influence of the oil–water flow conditions and pipe inclinations on the configuration, height, and length of the stratified interface are investigated.

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“…The mixing and diffusion of material in the liquid film are closely related to the velocity distribution in the liquid film and the velocity change on the free surface. [21,22] There are three primary methods for characterizing the velocity distribution in the liquid film and the free surface: theoretical analysis, experimental testing, and computational fluid dynamics (CFD). Early on, Nusselt used laminar flow model analysis to determine the typical parabolic velocity distribution characteristics of a falling film flow driven by gravity on a smooth vertical structure.…”

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confidence: 99%

The velocity field characteristics of high‐viscosity fluids falling film flow down clamped channels

Wang

Chen

et al. 2023

Can J Chem Eng

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The complexity of falling film flow has been studied in many industrial applications. In this work, the velocity field of high-viscosity fluids falling film flow down clamped channels was investigated numerically and experimentally.The results show that the numerical simulation results are consistent with the experimental results, and the characteristics of the velocity field are related to the fluid properties, operating conditions, and structure of the clamped channels. When the fluid viscosity is greater than or equal to 10 Pa Á s, the type of velocity field changes into I shape, U shape, and V shape. While the fluid viscosity drops to 0.89 Pa Á s, the viscous force cannot resist the inertial force and gravity, resulting in a cardioid velocity field. By adjusting the structure of the clamped channels and operating conditions, the tension of the liquid film can be changed, and the velocity distribution of the liquid film can be manipulated.Significantly, under the fluctuating curtain flow, the liquid film coalesces and breaks frequently, which enlarges the surface area of the liquid film and strengthens the surface renewal frequency. Hence, this form of falling film flow can be applied to process intensification of high-viscosity materials.clamped channels, falling film flow, high-viscosity fluids, velocity field | INTRODUCTIONAs an energy-efficient process for intensifying heat and mass transfer, falling film flows have been widely used in chemical engineering, [1] refrigeration, [2] and seawater desalination. [3] Various flow patterns of falling film flows based on fluid properties, the geometric structure of the supporting wall, the working environment, and other factors have been described in the literature. Many reports found that the flow patterns of liquid film flow down vertical geometric structures could be categorized as drop-like flows, inertially driven flows, gravity-driven flows, solitary wave-like flows, and disturbance flows. [4][5][6][7] Liquid viscosities can vary from low (0.001$1 Pa Á s), [8,9] such as water, glycerin, and aqueous lithium bromide solution, to high (thousands of times higher than the viscosity of low-viscosity fluids), [10][11][12] such as silicone oil, syrup, and melt polymer. The hydrodynamic mechanism of the falling film is strongly dependent on fluid viscosity. The falling film flow of low-viscosity liquid quickly evolves into wave flow driven by inertial force and gravity, [13] while the primary flow pattern of highviscosity fluid is peristaltic laminar flow due to the sizeable viscous resistance. Additionally, specific operating conditions may cause irregular fluctuations in falling film Abbreviations: CFD, computational fluid dynamics; LDA, laser doppler analysis; VOF, volume of fluids.

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Interfacial wave analysis of low viscous oil-water flow in upwardly inclined pipes

Cited by 6 publications

References 29 publications

New Measurement Method of Oil-Water Two-Phase Flow with High Water Holdup and Low Rate by Phase State Regulation

New Measurement Method of Oil-Water Two-Phase Flow with High Water Holdup and Low Rate by Phase State Regulation

Measurement of Interfacial Characteristics of Horizontal and Inclined Oil–Water Flows by Using Wire-Mesh Sensor

The velocity field characteristics of high‐viscosity fluids falling film flow down clamped channels

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