Study on hydrodynamic characteristics of oil-water annular flow in 90° elbow

Wu, Junqiang; Jiang, Wenming; Liu, Yang; He, Yi; Chen, Jianan; Qiao, Liang; Wang, Tianyu

doi:10.1016/j.cherd.2019.11.013

Cited by 18 publications

(3 citation statements)

References 30 publications

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“…Meanwhile, for the purpose of analyzing the relative magnitude of the flow friction generated by water-lubricated flow and single-phase water flow, based on the pressure gradients measured experimentally for single-phase water flow and oil−water two-phase flow, the pressure gradient of oil−water two-phase flow is normalized to obtain the ratio of the pressure gradient of oil−water two-phase flow to that of single-phase water flow (RTS) under the same total flow rate. , The calculation formula is given by eq . It is worth noting that sometimes there is no visualization section in an experimental facility or researchers use heavy crude oil for experimental testing; the pressure gradient ratio can be adopted as a reference to assess whether the core annular flow (CAF) pattern has been generated .…”

Section: Methodsmentioning

confidence: 99%

Study on the Flow Characteristics of Heavy Oil−Water Two-Phase Flow in the Horizontal Pipeline

Yin,

Li,

Shen

et al. 2024

ACS Omega

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Aiming at the problem of transportation for heavy oil during the middle-later development stages of the Lvda oilfield, based on the self-developed design of a visual circulating flow experimental apparatus for heavy oil−water two-phase flow−the flow regime characteristics and corresponding drag properties of the two-phase flow of Lvda viscous oil, which is simulated by 500# industrial white oil and water in a horizontal pipeline are investigated experimentally. According to the Kelvin−Helmholtz instability theory, the flow pattern transition criteria from stratified flow to annular flow (AF) are proposed. The effects of 0.11−0.90 m/s oil superficial velocities, 0.06−1.49 m/s water superficial velocities, and 0.09−0.93 input water cuts on the drag reduction effect of different flow regimes are analyzed. The experimental results indicated that with the increase of mixing velocity and water volume fraction, stratified flow, AF, oil plug flow, and dispersed oil lump flow are successively observed in the horizontal heavy oil−water two-phase flow, in which AF is the main flow pattern. As the Froude number increases to 4.0, the input water volume fraction does not change any more and remains at about 10% of the total flow rate in the process of converting from stratified flow to AF. The four delivery approaches can archive the reduction of transportation resistance for heavy oil at different degrees, in which the transportation of heavy oil surrounded by a water ring has the best effect of drag reduction. At the optimal working conditions of 0.61 m/s oil superficial velocity, 0.07 m/s water superficial velocity, and 0.10 input water cut, the pressure drop of water annulus conveying for heavy oil is only 1/62.54 of that of separate transport for pure heavy oil under the same oil flow rate.

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Section: Methodsmentioning

confidence: 99%

Study on the Flow Characteristics of Heavy Oil−Water Two-Phase Flow in the Horizontal Pipeline

Yin,

Li,

Shen

et al. 2024

ACS Omega

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“…It can also be observed through experiments [19,20], numerical simulation [21,22], and theoretical analysis [23]. Based on the above influencing factors, different researchers have studied the influence of water accumulation on pipeline corrosion, interface distribution [24,25], influencing factors of oil flow carrying capacity [26,27], flow pattern characteristics [19,28], and oil-water interface fluctuation characteristics, etc. [14] However, the turbulence models based on Reynolds average method are mostly used in the above simulation studies, which cannot identify the small-scale turbulence information.…”

Section: Introductionmentioning

confidence: 99%

Study on the Law of Diesel Oil Carrying Water in Lanzhou–Chengdu–Chongqing Product Oil Pipeline Based on Large Eddy Simulation

et al. 2020

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Water accumulation at the bottom of the product oil pipeline will lead to corrosion damage to the pipeline. The study on water carrying laws of refined oil could provide a reference for the safe operation of the pipeline. In this paper, the actual size of Lanzhou–Jiangyou section of Lanzhou–Chengdu–Chongqing pipeline was taken as the pipeline size. The volume of fluid (VOF) model of oil-water two-phase flow based on large eddy simulation (LES) was established. The numerical simulation of the water-carrying behavior of the product oil in the inclined pipeline was carried out. The LES-based two-phase flow model can capture the characteristics of stratified flow, wavy stratified flow, and dispersed flow under various operating conditions. The model was applied to simulate the water carrying process under various oil inlet velocities and the inclined pipe angles. The results show that as the pipeline inclined angle is 10~20° and the oil inlet velocity is 0.66 m/s, the flow patterns in the pipeline mainly include stratified flow and wavy stratified flow. As the oil inlet velocity is 0.88~1.55 m/s, the flow patterns in the pipe are mainly stratified flow, wavy stratified flow, and dispersed flow. As the inclined angle of the pipeline is 30~40°, the flow patterns in the pipeline mainly include stratified flows, wavy stratified flows, and dispersed flows. Finally, with the increase of flow time, water can be carried completely from the pipeline through the oil. With the increase of oil inlet velocity, the water carrying capacity of oil gradually increases. With the increase of pipeline inclination, the water carrying capacity of oil firstly increases and then decreases.

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“…There are several theoretical and experimental investigations on CAF reported in some publications, including (Andrade et al, 2013;Babakhani Dehkordi et al, 2018;Balakhrisna et al, 2010;Brauner, 1991;Colombo et al, 2015;Sumana Ghosh et al, 2011;Goldstein et al, 2017;Grassi et al, 2008;Hwang et al, 1997;Jiang et al, 2018;Joseph et al, 1997;Oliemans et al, 1987;Shi et al, 2017;Sotgia et al, 2008;Strazza et al, 2011;Wu et al, 2020). The majority of these studies were conducted for straight pipes with horizontal or vertical orientation, sudden expansion or contraction (including variations on these designs), horizontal and slightly inclined pipes, and return bending.…”

Section: Introductionmentioning

confidence: 99%

Application of core annular flow for oil transportation in different pipe configurations using computational fluid dynamics

Dianita

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The application of Core Annular Flow (CAF) has become an interesting solution in transporting heavy oil through pipeline because of its energy reduction and cost efficiency. Current study conducted a 3D computational fluid dynamic (CFD) to simulate CAF of oil-water in horizontal T- and Y-pipe junctions with two types of oil characteristic i.e., oil as Newtonian fluid and oil as non-Newtonian Carreau Fluid. The 2k factorial statistical experimental design was applied to investigate the effect of geometry on the flow performance. Eight cases were run with different diameter combinations and junction angle. The most attractive design was measured by the high value of oil holdup with small average values of pressure gradient and pressure standard deviation. The simulation result showed the stable CAF along the upstream region but then broke up when passing the intersection. A strategy to recover the stability of CAF after passing the intersection area of a T-pipe without interrupting the flow process was also proposed specifically for T50-50 (T-pipe with inlet and outlet diameter of 50 mm) as the most desired design for water-oil as non-Newtonian Carreau Fluid case. An additional water insertion was introduced at the intersection point to support the recovery of CAF structure by suppressing fouling. The proposed design showed significant improvement of CAF consistency for downstream region until pipe outlets. Energy evaluation was also has been conducted and it was estimated that CAF in T50-50 was able to reduce the pressure drop to more than 90% compared to transportation without lubrication.� In addition, the cost of power consumption can be saved to more than 80% than single phase oil transportation. A scaled-up pipe size simulation was also completed to 10 times bigger dimension. More consistence result of lubricated flow was shown by bigger dimension pipe. �

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Study on hydrodynamic characteristics of oil-water annular flow in 90° elbow

Cited by 18 publications

References 30 publications

Study on the Flow Characteristics of Heavy Oil−Water Two-Phase Flow in the Horizontal Pipeline

Study on the Flow Characteristics of Heavy Oil−Water Two-Phase Flow in the Horizontal Pipeline

Study on the Law of Diesel Oil Carrying Water in Lanzhou–Chengdu–Chongqing Product Oil Pipeline Based on Large Eddy Simulation

Application of core annular flow for oil transportation in different pipe configurations using computational fluid dynamics

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