Pipeline flow of unstable and surfactant‐stabilized emulsions

Pal, Rajinder

doi:10.1002/aic.690391103

Cited by 126 publications

(116 citation statements)

References 25 publications

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“…This result also validates the findings of Masalova et al, [16] in which the stress-strain relationships obtained in the rheometer are more suitable for predicting the transport characteristics of emulsions in large pipes than in small pipes. For laminar-turbulent regime transition in a dispersed oil and water flow in pipes, the results of Pal [8] and Pouplin [12] show that the Hagen-Poiseuille relationship is valid for Reynolds numbers up to 4000 in the case of coarse emulsions. Therefore, in the following study the emulsions flow in pipes is employed to identify the laminar flow when the Reynolds number is < 4000.…”

Section: Shear Stress and Friction Factormentioning

confidence: 99%

“…In a laminar flow of power-law fluid in pipes, the shear stress and shear rate can be calculated using Equations (6,8). Figure 10 compares the experimental data of the shear stress with the shear rate obtained in pipes and the data measured in the rheometer.…”

Section: Shear Stress and Friction Factormentioning

confidence: 99%

“…Therefore, the stability of the emulsions in pipe flow is not as good as that in the rheometer, and these should be considered coarse emulsions. [3,8] Comparison between Rheological Measurements and Laminar Flow Data…”

Section: Mean Droplet Diameter Formed By the Static Mixermentioning

confidence: 99%

“…To solve these problems, considerable theoretical and experimental studies have been carried out using two different approaches: synthetic emulsions measured in a rheometer [3][4][5][6][7] and emulsions induced in pipe flow. [8][9][10][11][12][13][14][15] However, a few works have been carried out by simultaneously using two systems. [16][17][18][19] Masalova et al [16] studied the rheological and transport properties of water-in-oil emulsions.…”

Section: Introductionmentioning

confidence: 99%

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Rheological behaviour of oil and water emulsions and their flow characterization in horizontal pipes

Zhang

2016

Can J Chem Eng

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In this work, the rheological behaviour of oil and water emulsions and their flow characterization were studied using a Haake RS6000 rheometer and a lab scale flow loop. The rheological properties of the synthetic emulsions were investigated at oil volume fractions from 0.1-1.0 L/L and shear rates from 0.001-1000 s À1 at a system temperature of 20 8C. The emulsions flow, formed by the SMV static mixer installed before the test section, was observed in the 2-m long horizontal pipes with 25 and 50 mm inner diameters at different mixture flow rates from 0.01-7.00 m 3 /h. A comparison between rheological measurements and laminar flow data shows that the values of the Sauter mean droplet diameters formed by the SMV static mixer are approximately one order of magnitude bigger than those measured by the rheometer. For oil-in-water emulsions with low oil content, the stress-strain relationships obtained in the rheometer are more suitable for predicting the transport characteristics of the emulsions with a large pipe diameter than those with a small pipe diameter. In addition, the phase inversion points in the pipe flow are closer to those measured at high shear rates in the rheometer. Therefore, the apparent viscosity obtained by the rheology measurements at high shear rates could be introduced for accurate calculations of the mixture Reynolds number and the friction factor in emulsions flow.

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Section: Shear Stress and Friction Factormentioning

confidence: 99%

Section: Shear Stress and Friction Factormentioning

confidence: 99%

Section: Mean Droplet Diameter Formed By the Static Mixermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rheological behaviour of oil and water emulsions and their flow characterization in horizontal pipes

Zhang

2016

Can J Chem Eng

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“…Equation (19) was derived in our previous study [23] on entropy generation in pipeline flow of Newtonian emulsions.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Entropy Generation in Flow of Highly Concentrated Non-Newtonian Emulsions in Smooth Tubes

Pal

2014

Entropy

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Entropy generation in adiabatic flow of highly concentrated non-Newtonian emulsions in smooth tubes of five different diameters (7.15-26.54 mm) was investigated experimentally. The emulsions were of oil-in-water type with dispersed-phase concentration (φ ) ranging from 59.61-72.21% vol. The emulsions exhibited shear-thinning behavior in that the viscosity decreased with the increase in shear rate. The shear-stress (τ ) versus shear rate (γ ) data of emulsions could be described well by the power-law model:The flow behavior index n was less than 1 and it decreased sharply with the increase in φ whereas the consistency index K increased rapidly with the increase in φ . For a given emulsion and tube diameter, the entropy generation rate per unit tube length increased linearly with the increase in the generalized Reynolds number ( n Re_ ) on a log-log scale. For emulsions with φ 15 . 65 ≤ % vol., the entropy generation rate decreased with the increase in tube diameter. A reverse trend in diameter-dependence was observed for the emulsion with φ of 72.21% vol. New models are developed for the prediction of entropy generation rate in flow of power-law emulsions in smooth tubes. The experimental data shows good agreement with the proposed models.

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Dispersed oil–water–gas flow through a horizontal pipe

et al. 2009

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An experimental study of three‐phase dispersed flow in a horizontal pipe has been carried out. The pressure drop over the pipe strongly increases with increasing bubble and drop volume fraction. Because of the presence of drops the transition from dispersed bubble flow to elongated bubble flow occurs at a lower gas volume fraction. The gas bubbles have no significant influence on the phase inversion process. However, phase inversion has a strong effect on the gas bubbles. Just before inversion large bubbles are present and the flow pattern is elongated bubble flow. During the inversion process the bubbles break‐up quickly and as the dispersed drop volume fraction after inversion is much lower than before inversion, a dispersed bubble flow is present after inversion. (When inversion is postponed to high dispersed phase fractions, the volume fraction of the dispersed phase can be as high as 0.9 before inversion and as low as 0.1 after inversion.) © 2009 American Institute of Chemical Engineers AIChE J, 2009

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Pipeline flow of unstable and surfactant‐stabilized emulsions

Cited by 126 publications

References 25 publications

Rheological behaviour of oil and water emulsions and their flow characterization in horizontal pipes

Rheological behaviour of oil and water emulsions and their flow characterization in horizontal pipes

Entropy Generation in Flow of Highly Concentrated Non-Newtonian Emulsions in Smooth Tubes

Dispersed oil–water–gas flow through a horizontal pipe

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