A numerical study on two-phase core-annular flows of waxy crude oil/water in inclined pipes

Garmroodi, M.R. Daneshvar; Ahmadpour, Ali

doi:10.1016/j.cherd.2020.04.017

Cited by 17 publications

(2 citation statements)

References 48 publications

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“…Rovinsky et al found that the energy factor, velocity distribution, and pressure-drop-reduction factor were related to the viscosity ratio of oil and water. The energy factor increases as the viscosity ratio increases and is influenced by the flow rate ratio [34]. Sharma et al hypothesized that oil-water core-annular flow would be stable to its minimum total energy.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Interface Fluctuation and Energy Saving of Oil–Water Annular Flow

et al. 2022

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Oil–water annular flow is an efficient method of heavy oil transportation for energy-saving. To deeply study the influencing factors of the energy savings of oil–water annular flow, this paper compares the interface fluctuation and energy-saving situation of oil–water annular flow under different pipe structures (such as straight pipe, sudden-contraction pipe, and elbow pipe), flow parameters, and fluid properties. In the straight pipe, the flow parameters can impact the oil–water annular flow pattern and the energy savings, and the interface fluctuation is consistent with the energy savings. The stable oil–water core annular flow has slight interface fluctuation and significant energy savings. At the same time, the influences of pipe structure and fluid properties on energy saving are also analyzed. In the sudden-contraction pipe, the oil–water interface fluctuates, largely due to the sharp changes in flow cross-section, which leads to reduced energy savings. In the elbow, the oil–water interface fluctuates greatly due to the influence of centrifugal force caused by flow direction variation, and also leads to a decline in energy savings. The effects of oil property or annulus liquid property on the interface fluctuates, and the energy savings are analyzed; reducing surface tension is an effective measure to provide an energy-saving effect. These results can provide a reference for the design of heavy-oil-transportation pipelines, the analysis of interface fluctuation, and the energy-saving evaluation of oil–water annular flow.

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Section: Introductionmentioning

confidence: 99%

A Study of the Interface Fluctuation and Energy Saving of Oil–Water Annular Flow

et al. 2022

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“…The detail of how the diameter effect was interpreted as unseparated variables is presented in Section 3.4. (Garmroodi et al, 2020) 21/30 0.12-0.85 Sudden expansion & contraction (inclined)…”

Section: Computational Geometrymentioning

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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Blocking characteristics of high water-cut crude oil in low-temperature gathering and transportation pipeline

Yang

et al. 2021

Chemical Engineering Research and Design

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A numerical study on two-phase core-annular flows of waxy crude oil/water in inclined pipes

Cited by 17 publications

References 48 publications

A Study of the Interface Fluctuation and Energy Saving of Oil–Water Annular Flow

A Study of the Interface Fluctuation and Energy Saving of Oil–Water Annular Flow

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

Blocking characteristics of high water-cut crude oil in low-temperature gathering and transportation pipeline

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