Experimental investigation of phase inversion in an oil–water flow through a horizontal pipe loop

Piela, K.; Delfos, R.; Ooms, G.; Westerweel, J.; Oliemans, R.V.A.; Mudde, Robert F.

doi:10.1016/j.ijmultiphaseflow.2006.05.001

Cited by 51 publications

(41 citation statements)

References 17 publications

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“…We consider the case where oil and water flow as a dispersion, which can be seen as a single liquid phase with its specific properties such as density and viscosity. Previous studies have emphasised the importance of the phase inversion, by which the phase that is dispersed as droplets becomes the continuous phase, and vice-versa (Ioannou et al 2005;Piela et al 2006). At the phase inversion the effective viscosity of the oil-water mixture may be several orders of magnitude higher than the oil or water viscosity.…”

Section: Introductionmentioning

confidence: 99%

Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall

et al. 2008

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This study deals with the influence of bubbles on a vertical air-water pipe flow, for gas-lift applications. The effect of changing the bubble size is of particular interest as it has been shown to affect the pressure drop over the pipe. Local measurements on the bubbles characteristics in the wall region were performed, using standard techniques, such as high-speed video recording and optical fibre probe, and more specific techniques, such as two-phase hot film anemometry for the wall shear stress and conductivity measurement for the thickness of the liquid film at the wall. The injection of macroscopic air bubbles in a pipe flow was shown to increase the wall shear stress. Bubbles travelling close to the wall create a periodic perturbation. The injection of small bubbles amplifies this effect, because they tend to move in the wall region; hence, more bubbles are travelling close to the wall. A simple analysis based on a two-fluid set of equations emphasised the importance of the local gas fraction fluctuations on the wall shear stress.

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Section: Introductionmentioning

confidence: 99%

Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall

et al. 2008

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“…One possible way to manipulate and control the rate of exergy destruction in emulsion flows is to vary the droplet size distribution. In the past, a number of studies have been published on emulsion rheology [8,9,11,13,[15][16][17] and concurrent flow of oil and water in pipes [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. However, the analysis and interpretation of influence of droplet size and droplet size distribution on exergy destruction in emulsion flows is lacking.…”

Section: S Gtotal "mentioning

confidence: 99%

“…Figure 11 shows the exergy destruction plots for adiabatic laminar flow of mixtures of fine and coarse O/W emulsions in a pipeline of diameter 26.54 mm. The plots are generated using Equation (21) and the power law constants for mixtures of fine and coarse emulsions shown in Figure 5. The exergy destruction rate in fine emulsion is substantially higher than that in the coarse emulsion over the full range of Re_n.…”

Section: Smentioning

confidence: 99%

Influence of Droplet Size on Exergy Destruction in Flow of Concentrated Non-Newtonian Emulsions

Pal

2016

Energies

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Abstract:The influence of droplet size on exergy destruction rate in flow of highly concentrated oil-in-water emulsions was investigated experimentally in a cone and plate geometry. The oil concentration was fixed at 74.5% by volume. At this dispersed-phase (oil) concentration, two different droplet size emulsions were prepared: fine and coarse emulsions. The fine and coarse emulsions were mixed in different proportions to vary the droplet size distribution. Although the dispersed and matrix phases of the emulsions were Newtonian in nature, the emulsions exhibited a non-Newtonian (shear-thinning) behavior due to the high droplet concentration. The shear stress-shear rate data of the emulsions could be described adequately by a power law model. At low shear rates, the exergy destruction rate per unit volume of emulsion exhibited a minimum at a fine emulsion proportion of 35%. The results from the cone and plate geometry were used to simulate exergy loss in pipeline flow of emulsions. The pumping of emulsions becomes more efficient thermodynamically upon mixing of fine and coarse emulsions provided that the flow regime is maintained to be laminar and that the Reynolds number is kept at a low to moderate value. In the turbulent regime, the exergy loss generally increases upon mixing the fine and coarse emulsions.

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“…The research work carried out on this subject (simultaneous flow of oil and water in pipes) can be classified into four groups: (a) phase-inversion in oil-water pipe flows [10][11][12][13][14][15]; (b) droplet size and droplet size distribution in oil-water dispersed flows in pipes [16][17][18][19]; (c) flow patterns/maps in oil-water pipe flows [20][21][22][23]; and (d) pressure drop in oil-water pipe flows [6,[24][25][26]. To our knowledge, little or no attention has been given to the second law analysis and entropy production in pipeline flow of oil and water dispersions.…”

Section: Introductionmentioning

confidence: 99%

Entropy Production in Pipeline Flow of Dispersions of Water in Oil

Pal

2014

Entropy

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Entropy production in pipeline adiabatic flow of water-in-oil emulsions is investigated experimentally in three different diameter pipes. The dispersed-phase (water droplets) concentration of emulsion is varied from 0 to 41% vol. The entropy production rates in emulsion flow are compared with the values expected in single-phase flow of Newtonian fluids with the same properties (viscosity and density). While in the laminar regime the entropy production rates in emulsion flow can be described adequately by the single-phase Newtonian equations, a significant deviation from single-phase flow behavior is observed in the turbulent regime. In the turbulent regime, the entropy production rates in emulsion flow are found to be substantially smaller than those expected on the basis of single-phase equations. For example, the entropy production rate in water-in-oil emulsion flow at a dispersed-phase volume fraction of 0.41 is only 38.4% of that observed in flow of a single-phase Newtonian fluid with the same viscosity and density, when comparison is made at a Reynolds number of 4000. Thus emulsion flow in pipelines is more efficient thermodynamically than single-phase Newtonian flow.

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Experimental investigation of phase inversion in an oil–water flow through a horizontal pipe loop

Cited by 51 publications

References 17 publications

Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall

Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall

Influence of Droplet Size on Exergy Destruction in Flow of Concentrated Non-Newtonian Emulsions

Entropy Production in Pipeline Flow of Dispersions of Water in Oil

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