Density-stable yield-stress displacement flow of immiscible fluids in inclined pipes

Oladosu, Olamide; Bhakta, Jai; Alba, K.

doi:10.1016/j.jnnfm.2019.104203

Cited by 6 publications

(6 citation statements)

References 30 publications

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“…where the values of G and G as ω → 0 can be approximated to G (ω = 0.06 rad/s) and G (ω = 0.06 rad/s) which is the lowest measured value of frequency in Figure 5, similarly to the analysis by Oladosu et al [75]. From Equation 6, the relaxation times of the VES solutions in the linear viscoelastic regime are as follows: λ ∼ 148 s for 1.35% VES, λ ∼ 100 s for 1.00% VES and λ ∼ 38 s for 0.05% VES.…”

Section: Ves Solutionssupporting

confidence: 58%

Turbulent drag reduction of viscoelastic wormlike micellar gels

Mitishita¹,

Elfring²,

Frigaard³

2021

Preprint

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Long-chained, viscoelastic surfactant solutions (VES) have been widely employed in the oil and gas industry, particularly in hydraulic fracturing and gravel-packing operations, where turbulence is commonly reached due to high pumping rates. With this motivation, we experimentally investigate the turbulent duct flow of an under-studied class of wormlike micellar solutions that forms a gel at room temperature. The fluid is characterized via rotational rheometry, and the turbulent velocity and Reynolds stress profiles are measured via Laser Doppler Anemometry (LDA). Three surfactant concentrations are investigated at increasing Reynolds numbers. The turbulent flow fields of water, and semi-dilute solutions of partially hydrolyzed polyacrylamide (HPAM) and xanthan gum (XG) are used as comparisons. Our study reveals that the gel-like structure of the wormlike micellar gel is mostly broken down during turbulent flow, especially in the near-wall region where the results indicate the presence of a water layer. Turbulent flow at low concentrations of surfactant show a Newtonian-like flow field throughout most of the duct, where the energy spectra shows a −5/3 power law scale with wavenumber, whereas higher concentrations lead to drag reduction and lower power spectral densities at large wavenumbers. A comparison of the flow of polymeric fluids and the wormlike micellar solutions at maximum drag reduction (MDR) shows comparable drag-reduction effects, with a large decrease in Reynolds shear stresses, and increased turbulence anisotropy in the buffer layer due to the large streamwise fluctuations and near-zero wall-normal fluctuations. At the centreline of the duct, the power spectral densities of polymers and VES are significantly reduced at all wavenumbers probed. Additionally, the MDR regime was bounded by Virk's asymptote for both polymers and the micellar gel, which implies a similar mechanism of drag reduction at MDR.

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Section: Ves Solutionssupporting

confidence: 58%

Turbulent drag reduction of viscoelastic wormlike micellar gels

Mitishita¹,

Elfring²,

Frigaard³

2021

Preprint

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“…Different relevant geometry shapes were investigated, e.g., the Hele-Shaw cell [4][5], rectangular channels [6][7], pipes [8][9], eccentric annuli [10][11], and capillary tubes [12][13]. In addition, the displacement flow could be performed in stationary pipes [14][15] and rotating pipes [16][17][18]. Moreover, the displacement flow in pipes can be carried out in horizontal [12,[19][20], tilt [21][22], and vertical [23] directions.…”

Section: Introductionmentioning

confidence: 99%

“…Fluids properties (e.g., fluid density, imposed velocity, rheological property, miscibility) also affect the displacement flows. Fluid density configurations, e.g., density-stable [15,24] and density-unstable [16,21], and isodensity [19] configurations were investigated. Regarding the flow regime, a majority of research works focus on imposed flow in the laminar regime [14,20], some studies concentrate on transition flow regimes [9,24], and several works explore the turbulent flow regimes [17], while a few works investigate the exchange flow [17] (which means no imposed flows).…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the flow regime, a majority of research works focus on imposed flow in the laminar regime [14,20], some studies concentrate on transition flow regimes [9,24], and several works explore the turbulent flow regimes [17], while a few works investigate the exchange flow [17] (which means no imposed flows). When considering the fluid rheological properties in displacement flows, the Newtonian [9,19,24] and non-Newtonian (viscoplastic) [8,15] fluids are investigated. Miscible displacement flows occur when two liquids can intermix and penetrate each other at the interface.…”

Section: Introductionmentioning

confidence: 99%

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A quantitative study of immiscible and miscible displacement flows in a rotating pipe

Liu,

Hassanzadeh,

Akbari

et al. 2023

Progress in Canadian Mechanical Engineering. Volume 6

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Displacements of oil-based and water-based fluids, corresponding to miscible and immiscible fluids, exist widely in well cementing processes in the oil & gas industry. In this paper, we experimentally investigate the density-unstable miscible and immiscible displacement flows in an axially rotating pipe. The density of displacing fluid is larger than that of the displaced fluid (𝜌 ̂𝐻 > 𝜌 ̂𝐿). In our experiments, the density difference (quantified via 𝐴𝑡 = 0.041 ), the viscosity ratio ( 𝑀 = 0.22 ), and the inclination angle ( 𝛽 = 83°) are kept constant. The pipe rotating speed (𝜔 ̂) and imposed flow velocity ( 𝑈 ̂0 ) are the most critical parameters in this study.Correspondingly, the effects of the imposed flow inertia and rotating inertia are investigated. Sequences of images are captured by a high-speed camera and their spatiotemporal concentration profiles are analyzed. The immiscible displacement flows are quantitatively analyzed and compared with miscible displacement flows. Based on our results, two kinds of downstream interfacial fronts are found in the immiscible displacement flow, but only one is witnessed in the miscible displacement flow. Also, our results show that, by increasing the imposed flow velocity, the interfacial front moves faster. On the other hand, when increasing the rotating speed, the first front velocities are slower. For displacement flows without a rotation, the first front velocities of the miscible displacement flows are smaller than those of the immiscible conditions. Nevertheless, for the displacement flows with a rotation, the first front velocities of the miscible displacement flows are larger than those of the immiscible conditions.

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“…2020, 10, x FOR PEER REVIEW 3 of 21 (2) The effect of porous structure is neglected and immiscible displacement flow in a single passage is considered. The "single passage" simplification is made referring to the research works on pure displacement process [22][23][24][25][26][27][28], in which the essential feature of the displacement process could be reflected. The "immiscible displacement" simplification comes from the fact that as a candidate of the cryogenic fracturing fluid, liquid nitrogen (LN2) is hardly soluble in water.…”

Section: Introductionmentioning

confidence: 99%

A Novel 2D Model for Freezing Phase Change Simulation during Cryogenic Fracturing Considering Nucleation Characteristics

Huang

Wang

2020

Applied Sciences

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A 2D computational fluid dynamics (CFD) model in consideration of nucleation characteristics (homogeneous/heterogeneous nucleation) using the volume of fluid (VOF) method and Lee model was proposed. The model was used to predict the process of a multiphase flow accompanied by freezing phase change during cryogenic fracturing. In this model, nucleation characteristic (homogeneous and heterogeneous nucleation) during the freezing process and the influence of the formed ice phase on the flowing behavior was considered. Validation of the model was done by comparing its simulation results to Neumann solutions for classical Stefan problem. The comparison results show that the numerical results are well consistent with the theoretical solution. The maximum relative differences are less than 7%. The process of multiphase flow accompanied by the freezing of water was then simulated with the proposed model. Furthermore, the transient formation and growth of ice as well as the evolution of temperature distribution in the computational domain was studied. Results show that the proposed method can better consider the difference between homogeneous nucleation in the fluid domain and heterogeneous nucleation on the wall boundary. Finally, the main influence factors such as the flow velocity and initial distribution of ice phase on the fracturing process were discussed. It indicates that the method enable to simulate the growth of ice on the wall and its effect on the flow of multiphase fluid.

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Density-stable yield-stress displacement flow of immiscible fluids in inclined pipes

Cited by 6 publications

References 30 publications

Turbulent drag reduction of viscoelastic wormlike micellar gels

Turbulent drag reduction of viscoelastic wormlike micellar gels

A quantitative study of immiscible and miscible displacement flows in a rotating pipe

A Novel 2D Model for Freezing Phase Change Simulation during Cryogenic Fracturing Considering Nucleation Characteristics

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