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Prediction of three-phase relative permeabilities of Berea sandstone using lattice Boltzmann method EI SCIE
期刊论文 | 2021 , 33 (6) | PHYSICS OF FLUIDS
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Abstract :

Three-phase flows through a pore network of Berea sandstone are studied numerically under critical interfacial tension conditions. Results show that the relative permeability of each fluid increases as its own saturation increases. The specific interfacial length between wetting and nonwetting fluids monotonously decreases with increasing the saturation of intermediate-wetting fluid, while the other two specific interfacial lengths exhibit a nonmonotonous variation. As the wetting (nonwetting) fluid becomes less wetting (nonwetting), the relative permeability of wetting fluid monotonously increases, while the other two relative permeabilities show a nonmonotonous trend. Due to the presence of a spreading layer, the specific interfacial length between wetting and nonwetting fluids always stabilizes at a low level. As the viscosity ratio of wetting (nonwetting) to intermediate-wetting fluids increases, the relative permeability of wetting (nonwetting) fluid increases. With the viscosity ratio deviating from unity, the phase interfaces become increasingly unstable, leading to an increased specific interfacial length.

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GB/T 7714 Li, Sheng , Jiang, Fei , Wei, Bei et al. Prediction of three-phase relative permeabilities of Berea sandstone using lattice Boltzmann method [J]. | PHYSICS OF FLUIDS , 2021 , 33 (6) .
MLA Li, Sheng et al. "Prediction of three-phase relative permeabilities of Berea sandstone using lattice Boltzmann method" . | PHYSICS OF FLUIDS 33 . 6 (2021) .
APA Li, Sheng , Jiang, Fei , Wei, Bei , Hou, Jian , Liu, Haihu . Prediction of three-phase relative permeabilities of Berea sandstone using lattice Boltzmann method . | PHYSICS OF FLUIDS , 2021 , 33 (6) .
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A microfluidic synthesis method for preparation and regulation of 3-ami-nophenol formaldehyde resin spheres EI SCIE
期刊论文 | 2021 , 165 | REACTIVE & FUNCTIONAL POLYMERS
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Preparation of resin spheres with high monodispersity and controllable size is of significant value for the research and development of functional composite particles applicable to energy exploitations, biomedical technologies and micro-/nanofluidic devices. Unfortunately, traditional bulk synthesis for resin spheres suffers from some drawbacks including inaccurate control over flow and reaction conditions, high requirements on equipment and operation, and sometimes hazardous to operators and environment. In this paper, a microfluidic platform assembled with separated charging inlets, winding channel and helical tube structure is designed for the controllable synthesis of small sized and monodispersed 3-aminophenol formaldehyde resin spheres. The optimal operating conditions are found with the flow rates of 200 mu L/min for continuous phase and 15 mu L/min for each reagent flow, and the residence time of 270 s and temperature of 80 degrees C in the water-bath. The obtained resin particles show regular spherical shapes and have a small size of around 250 nm with high monodispersity (polydispersity index <4%). The present microfluidic platform not only provides a promising substitution to traditional bulk synthesis but also allows for the accurate regulations of particle size and monodispersity.

Keyword :

Microfluidic synthesis Resin spheres Monodispersity

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GB/T 7714 Liu, Feng , Yin, Kai , Liu, Haihu . A microfluidic synthesis method for preparation and regulation of 3-ami-nophenol formaldehyde resin spheres [J]. | REACTIVE & FUNCTIONAL POLYMERS , 2021 , 165 .
MLA Liu, Feng et al. "A microfluidic synthesis method for preparation and regulation of 3-ami-nophenol formaldehyde resin spheres" . | REACTIVE & FUNCTIONAL POLYMERS 165 (2021) .
APA Liu, Feng , Yin, Kai , Liu, Haihu . A microfluidic synthesis method for preparation and regulation of 3-ami-nophenol formaldehyde resin spheres . | REACTIVE & FUNCTIONAL POLYMERS , 2021 , 165 .
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Modeling the deformation of a surfactant-covered droplet under the combined influence of electric field and shear flow EI SCIE
期刊论文 | 2021 , 33 (4) | PHYSICS OF FLUIDS
WoS CC Cited Count: 1
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A surfactant-covered droplet subject to both electric field and shear flow is studied using a lattice Boltzmann and finite difference hybrid method, which breaks the limitation of asymptotic approaches that allow only small droplet deformation. It is found that in the electric system where electric field induces circulating flows directed from equator to poles, the presence of surfactants promotes droplet deformation for each electric capillary number (Ca-E), whereas in the electric system where droplets exhibit a prolate shape and circulating flows are directed from poles to equator, the presence of surfactants hinders droplet deformation at high Ca-E. We also for the first time show that in the electric system where droplet exhibits an oblate shape, the presence of surfactants almost has no effect on droplet deformation at high Ca-E. Regardless of electric properties and Ca-E, the inclination angle of surfactant-covered droplets is always smaller than that of clean droplets.

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GB/T 7714 Zhang, Jinggang , Liu, Haihu , Zhang, Xitong . Modeling the deformation of a surfactant-covered droplet under the combined influence of electric field and shear flow [J]. | PHYSICS OF FLUIDS , 2021 , 33 (4) .
MLA Zhang, Jinggang et al. "Modeling the deformation of a surfactant-covered droplet under the combined influence of electric field and shear flow" . | PHYSICS OF FLUIDS 33 . 4 (2021) .
APA Zhang, Jinggang , Liu, Haihu , Zhang, Xitong . Modeling the deformation of a surfactant-covered droplet under the combined influence of electric field and shear flow . | PHYSICS OF FLUIDS , 2021 , 33 (4) .
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Preferential imbibition in a dual-permeability pore network EI SCIE
期刊论文 | 2021 , 915 | JOURNAL OF FLUID MECHANICS
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A deep understanding of two-phase displacement in porous media with permeability contrast is essential for the design and optimisation of enhanced oil recovery processes. In this paper, we investigate the forced imbibition behaviour in two dual-permeability geometries that are of equal permeability contrast. First, a mathematical model is developed for the imbibition in a pore doublet, which shows that the imbibition dynamics can be fully described by the viscosity ratio A and capillary number Ca-m which creatively incorporates the influence of channel width and length. Through the finite difference solution of the mathematical model, a lambda-Ca-m phase diagram is established to characterise the imbibition preference in the pore doublet. We then investigate the imbibition process in a dual-permeability pore network using a well-established lattice Boltzmann method, focusing on the competition between the viscous and capillary forces. Like in the pore doublet, the preferential imbibition occurs in high-permeability zone at high Ca m but in low-permeability zone at low Ca-m . When Ca-m is not sufficiently high, an oblique advancing pattern is observed which is attributed to non-trivial interfacial tension. Using the newly defined capillary number, the critical Ca m curve on which the breakthrough simultaneously occurs in both permeability zones is found to match well with that from the pore doublet and it is the optimal condition for maximising the imbibition efficiency in the entire pore network.

Keyword :

multiphase flow porous media

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GB/T 7714 Gu, Qingqing , Liu, Haihu , Wu, Lei . Preferential imbibition in a dual-permeability pore network [J]. | JOURNAL OF FLUID MECHANICS , 2021 , 915 .
MLA Gu, Qingqing et al. "Preferential imbibition in a dual-permeability pore network" . | JOURNAL OF FLUID MECHANICS 915 (2021) .
APA Gu, Qingqing , Liu, Haihu , Wu, Lei . Preferential imbibition in a dual-permeability pore network . | JOURNAL OF FLUID MECHANICS , 2021 , 915 .
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Lattice Boltzmann simulation of three-phase flows with moving contact lines on curved surfaces EI SCIE PubMed
期刊论文 | 2021 , 104 (1) | PHYSICAL REVIEW E
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A numerical method for simulating three-phase flows with moving contact lines on arbitrarily complex surfaces is developed in the framework of the lattice Boltzmann method. In this method, the immiscible three-phase flow is modeled through a multiple-relaxation-time color-gradient model, which not only allows for a full range of interfacial tensions but also produces stable outcomes for a wide range of viscosity ratios. A characteristic line model is introduced to implement the wetting boundary condition, which is not only easy to implement but is also able to handle arbitrarily complex boundaries with prescribed contact angles. The developed method is first validated by the simulation of a Janus droplet resting on a flat surface, a perfect Janus droplet deposited on a cylinder, and the capillary intrusion of ternary fluids for various viscosity ratios. It is then used to study a compound droplet subject to a uniform incoming flow passing through a multipillar structure, where three different values of surface wettability are considered. The simulated results show that the surface wettability has significant impact on the droplet dynamic behavior and final fluid distribution.

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GB/T 7714 Li, Sheng , Lu, Yang , Jiang, Fei et al. Lattice Boltzmann simulation of three-phase flows with moving contact lines on curved surfaces [J]. | PHYSICAL REVIEW E , 2021 , 104 (1) .
MLA Li, Sheng et al. "Lattice Boltzmann simulation of three-phase flows with moving contact lines on curved surfaces" . | PHYSICAL REVIEW E 104 . 1 (2021) .
APA Li, Sheng , Lu, Yang , Jiang, Fei , Liu, Haihu . Lattice Boltzmann simulation of three-phase flows with moving contact lines on curved surfaces . | PHYSICAL REVIEW E , 2021 , 104 (1) .
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Deformation and breakup of a compound droplet in three-dimensional oscillatory shear flow EI SCIE
期刊论文 | 2021 , 134 | International Journal of Multiphase Flow
WoS CC Cited Count: 4
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Abstract :

A compound droplet subject to three-dimensional oscillatory shear flow is studied using a three-phase lattice Boltzmann model. Firstly, focusing on low values of capillary number (Ca) where the compound droplet eventually reaches steady-state oscillatory condition, we study the effect of oscillatory period, viscosities of inner and outer fluids of the compound droplet, wall confinement and Ca on the droplet behavior. As the oscillatory period increases, the maximum deformation parameters gradually approach the steady-state values in the corresponding simple shear flow for both inner and outer droplets, and the compound droplet is more synchronous with applied shear. We demonstrate for the first time that due to high pressure near two tips inside the outer droplet the inner droplet may rotate counterintuitively in a direction opposite to the outer one. The compound droplet undergoes larger deformation when either droplet is less viscous, which also decreases the synchronization between inner and outer droplets. Increasing confinement ratio not only promotes the deformations of both constituent droplets, but also makes them more synchronous with applied shear. It is also found that the maximum deformation parameters of both droplets increase linearly with Ca up to Ca=0.35 but deviate from the linearity at higher Ca, where multipeaked oscillations are observed for the deformation of the inner droplet, which can be due to the extensional flow resulting from the rapid contraction of the outer droplet. We then analyze the breakup behavior of compound droplet in the oscillatory shear flow for varying confinement ratios, and compare the findings with those in simple shear flow. The critical capillary number for droplet breakup exhibits a non-monotonic behavior with the confinement ratio in both shear flows, but its value is always higher in oscillatory shear flow than in simple shear flow. As the confinement ratio increases, in the case of oscillatory shear flow, the droplet undergoes a transition from inner ternary breakup to inner binary breakup, distinct from the one observed in the case of simple shear flow. Finally, increasing oscillatory period is found to not only decrease the critical capillary number but also change the mode of droplet breakup. © 2020 Elsevier Ltd

Keyword :

Drop breakup Capillarity Drop formation Deformation Shear flow Calcium compounds

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GB/T 7714 Liu, Haihu , Lu, Yang , Li, Sheng et al. Deformation and breakup of a compound droplet in three-dimensional oscillatory shear flow [J]. | International Journal of Multiphase Flow , 2021 , 134 .
MLA Liu, Haihu et al. "Deformation and breakup of a compound droplet in three-dimensional oscillatory shear flow" . | International Journal of Multiphase Flow 134 (2021) .
APA Liu, Haihu , Lu, Yang , Li, Sheng , Yu, Yuan , Sahu, Kirti Chandra . Deformation and breakup of a compound droplet in three-dimensional oscillatory shear flow . | International Journal of Multiphase Flow , 2021 , 134 .
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Modelling a surfactant-covered droplet on a solid surface in three-dimensional shear flow SCIE
期刊论文 | 2020 , 897 | JOURNAL OF FLUID MECHANICS
WoS CC Cited Count: 1
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A surfactant-covered droplet on a solid surface subject to a three-dimensional shear flow is studied using a lattice-Boltzmann and finite-difference hybrid method, which allows for the surfactant concentration beyond the critical micelle concentration. We first focus on low values of the effective capillary number (Ca-e) and study the effect of Ca-e, viscosity ratio (lambda) and surfactant coverage on the droplet behaviour. Results show that at low Ca-e the droplet eventually reaches steady deformation and a constant moving velocity u(d). The presence of surfactants not only increases droplet deformation but also promotes droplet motion. For each lambda, a linear relationship is found between contact-line capillary number and Ca-e, but not between wall stress and u(d) due to Marangoni effects. As lambda increases, u(d) decreases monotonically, but the deformation first increases and then decreases for each Ca-e. Moreover, increasing surfactant coverage enhances droplet deformation and motion, although the surfactant distribution becomes less non-uniform. We then increase Ca-e and study droplet breakup for varying lambda, where the role of surfactants on the critical Ca-e (Ca-e,Ca-c) of droplet breakup is identified by comparing with the clean case. As in the clean case, Ca-e,Ca-c first decreases and then increases with increasing lambda, but its minima occurs at lambda = 0.5 instead of lambda = 1 in the clean case. The presence of surfactants always decreases Ca-e,Ca-c, and its effect is more pronounced at low lambda. Moreover, a decreasing viscosity ratio is found to favour ternary breakup in both clean and surfactant-covered cases, and tip streaming is observed at the lowest lambda in the surfactant-covered case.

Keyword :

coalescence breakup contact lines Marangoni convection

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GB/T 7714 Liu, Haihu , Zhang, Jinggang , Ba, Yan et al. Modelling a surfactant-covered droplet on a solid surface in three-dimensional shear flow [J]. | JOURNAL OF FLUID MECHANICS , 2020 , 897 .
MLA Liu, Haihu et al. "Modelling a surfactant-covered droplet on a solid surface in three-dimensional shear flow" . | JOURNAL OF FLUID MECHANICS 897 (2020) .
APA Liu, Haihu , Zhang, Jinggang , Ba, Yan , Wang, Ningning , Wu, Lei . Modelling a surfactant-covered droplet on a solid surface in three-dimensional shear flow . | JOURNAL OF FLUID MECHANICS , 2020 , 897 .
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A new capillary force model implemented in lattice Boltzmann method for gas-liquid-solid three-phase flows EI SCIE Scopus
期刊论文 | 2020 , 32 (10) | Physics of Fluids | IF: 3.521
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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A lattice Boltzmann method is developed for the direct numerical simulation of gas, liquid, and solid three-phase flows. The liquid-gas two-phase flow with a high density ratio is solved using a phase-field model where the interface evolution is described by the conservative Allen-Cahn equation, and the dynamics of the solid particle is captured by the momentum exchange method. By distributing the surface tension over the entire diffuse interface, a new model is proposed to account for the capillary force exerted on the particle, which not only is suited for curved boundaries but can also be implemented in a simple and accurate manner. Several typical benchmark cases, including the wetting behavior of a particle on the liquid-gas interface, a bubble adhering to a particle that can move freely, and the sinking of a horizontal cylinder through an air-water interface, are used to validate the present method. Results show the necessity to incorporate the capillary force on the contact lines, especially when the surface tension is a dominant factor, and that the new capillary force model is able to calculate the capillary force accurately and suppress the oscillations of the capillary force. In addition, the capability of the present method for particle interactions is further demonstrated by studying the self-assembling behavior of three hydrophilic particles on a liquid-gas interface. © 2020 Author(s).

Keyword :

Gases Liquefied gases Wetting Phase interfaces Surface tension Two phase flow Numerical methods Air Kinetic theory

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GB/T 7714 Zhang, Xitong , Liu, Haihu , Zhang, Jinggang . A new capillary force model implemented in lattice Boltzmann method for gas-liquid-solid three-phase flows [J]. | Physics of Fluids , 2020 , 32 (10) .
MLA Zhang, Xitong et al. "A new capillary force model implemented in lattice Boltzmann method for gas-liquid-solid three-phase flows" . | Physics of Fluids 32 . 10 (2020) .
APA Zhang, Xitong , Liu, Haihu , Zhang, Jinggang . A new capillary force model implemented in lattice Boltzmann method for gas-liquid-solid three-phase flows . | Physics of Fluids , 2020 , 32 (10) .
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Direct numerical simulation of the sedimentation of a particle pair in a shear-thinning fluid EI SCIE Scopus
期刊论文 | 2020 , 5 (1) | PHYSICAL REVIEW FLUIDS | IF: 2.537
WoS CC Cited Count: 7 SCOPUS Cited Count: 2
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By combining the momentum exchange method and a unified interpolation bounce-back scheme, a multiple-relaxation-time lattice Boltzmann method is developed to simulate the particle dynamics in a power-law fluid. With this method, the sedimentation of a particle pair in a shear-thinning power-law fluid for the generalized Archimedes number (Ar*) varying from 100 to 400 is studied. Depending on the value of Ar* and initial geometrical configuration, the particle pair is found to experience several different movement states, namely, the steady oblique doublet, periodic oscillation, period-doubling bifurcation, steady horizontal doublet, and chaos. Distinct from two groups of multiple stable states in the Newtonian system, three groups of multiple stable states are clearly identified in the present shear-thinning system: the steady oblique coexists with the periodic oscillation, the steady horizontal doublet coexists with the period-doubling bifurcation, and the steady horizontal doublet coexists with the chaos state. Moreover, the drafting, kissing, and tumbling (DKT) behavior of a particle pair observed in the Newtonian system is absent in the present shear-thinning system. It is attributed to the high-viscosity region between the particles, which can increase the viscous drag acting on the particle, thus preventing the particles from approaching each other and reducing particle aggregation. In addition, a critical value of the power-law index is obtained, below which the DKT state would not happen regardless of Ar*.

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GB/T 7714 Zhang, Xitong , Liu, Haihu , Zhang, Ya et al. Direct numerical simulation of the sedimentation of a particle pair in a shear-thinning fluid [J]. | PHYSICAL REVIEW FLUIDS , 2020 , 5 (1) .
MLA Zhang, Xitong et al. "Direct numerical simulation of the sedimentation of a particle pair in a shear-thinning fluid" . | PHYSICAL REVIEW FLUIDS 5 . 1 (2020) .
APA Zhang, Xitong , Liu, Haihu , Zhang, Ya , Wang, Liang . Direct numerical simulation of the sedimentation of a particle pair in a shear-thinning fluid . | PHYSICAL REVIEW FLUIDS , 2020 , 5 (1) .
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Pore-scale study of counter-current imbibition in strongly water-wet fractured porous media using lattice Boltzmann method EI SCIE Scopus
期刊论文 | 2019 , 31 (8) | PHYSICS OF FLUIDS
SCOPUS Cited Count: 6
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Oil recovery from naturally fractured reservoirs with low permeability rock remains a challenge. To provide a better understanding of spontaneous imbibition, a key oil recovery mechanism in the fractured reservoir rocks, a pore-scale computational study of the water imbibition into an artificially generated dual-permeability porous matrix with a fracture attached on top is conducted using a recently improved lattice Boltzmann color-gradient model. Several factors affecting the dynamic countercurrent imbibition processes and the resulting oil recovery have been analyzed, including the water injection velocity, the geometry configuration of the dual permeability zones, interfacial tension, the viscosity ratio of water to oil phases, and fracture spacing if there are multiple fractures. Depending on the water injection velocity and interfacial tension, three different imbibition regimes have been identified: the squeezing regime, the jetting regime, and the dripping regime, each with a distinctively different expelled oil morphology in the fracture. The geometry configuration of the high and low permeability zones affects the amount of oil that can be recovered by the countercurrent imbibition in a fracture-matrix system through transition of the different regimes. In the squeezing regime, which occurs at low water injection velocity, the build-up squeezing pressure upstream in the fracture enables more water to imbibe into the permeability zone closer to the fracture inlet thus increasing the oil recovery factor. A larger interfacial tension or a lower water-to-oil viscosity ratio is favorable for enhancing oil recovery, and new insights into the effect of the viscosity ratio are provided. Introducing an extra parallel fracture can effectively increase the oil recovery factor, and there is an optimal fracture spacing between the two adjacent horizontal fractures to maximize the oil recovery. These findings can aid the optimal design of water-injecting oil extraction in fractured rocks in reservoirs such as oil shale.

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GB/T 7714 Gu, Qingqing , Zhu, Lianhua , Zhang, Yonghao et al. Pore-scale study of counter-current imbibition in strongly water-wet fractured porous media using lattice Boltzmann method [J]. | PHYSICS OF FLUIDS , 2019 , 31 (8) .
MLA Gu, Qingqing et al. "Pore-scale study of counter-current imbibition in strongly water-wet fractured porous media using lattice Boltzmann method" . | PHYSICS OF FLUIDS 31 . 8 (2019) .
APA Gu, Qingqing , Zhu, Lianhua , Zhang, Yonghao , Liu, Haihu . Pore-scale study of counter-current imbibition in strongly water-wet fractured porous media using lattice Boltzmann method . | PHYSICS OF FLUIDS , 2019 , 31 (8) .
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