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Chang Y, Zhang Y, Niu Z, Chen X, Du M, Yang Z. A Heterogeneous Viscosity Flow Model for Liquid Transport through Nanopores Considering Pore Size and Wettability. Molecules 2024; 29:3176. [PMID: 38999127 PMCID: PMC11243303 DOI: 10.3390/molecules29133176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Revised: 06/24/2024] [Accepted: 06/30/2024] [Indexed: 07/14/2024] Open
Abstract
The confinement effect in micro- and nanopores gives rise to distinct flow characteristics in fluids. Clarifying the fluid migration pattern in confined space is crucial for understanding and explaining the abnormal flow phenomena in unconventional reservoirs. In this study, flow characteristics of water and oil in alumina nanochannels were investigated with diameters ranging from 21 nm to 120 nm, and a heterogeneous viscosity flow model considering boundary fluid was proposed. Compared with the prediction of the HP equation, both types of fluids exhibit significant flow suppression in nanochannels. As the channel size decreases, the deviation degree increases. The fluid viscosity of the boundary region displays an upward trend as the channel size decreases and the influence of the interaction between the liquid and solid walls intensifies. The thickness of the boundary region gradually decreases with increasing pressure and eventually reaches a stable value, which is primarily determined by the strength of the interaction between the liquid and solid surfaces. Both the pore size and wettability are essential factors that affect the fluid flow. When the space scale is extremely small, the impact of wettability becomes more pronounced. Finally, the application of the heterogeneous flow model for permeability evaluation has yielded favorable fitting results. The model is of great significance for studying the fluid flow behavior in unconventional reservoirs.
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Affiliation(s)
- Yilin Chang
- University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
- Sinopec North China Petroleum Bureau, Zhengzhou 450006, China
| | - Yapu Zhang
- Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina Company Limited, Beijing 100083, China
| | - Zhongkun Niu
- University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina Company Limited, Beijing 100083, China
| | - Xinliang Chen
- University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina Company Limited, Beijing 100083, China
| | - Meng Du
- University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina Company Limited, Beijing 100083, China
| | - Zhengming Yang
- Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
- Research Institute of Petroleum Exploration & Development, PetroChina Company Limited, Beijing 100083, China
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2
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Nie B. Diffusion characteristics of shale mixed gases on the wall of microscale fractures. ENERGY 2023; 284:128405. [DOI: 10.1016/j.energy.2023.128405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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3
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Qin W, Guo Y, Sun L, Shi J, Bao B. Spontaneous Imbibition in Nanomatrix-Fracture of Low Permeability Using Multiscale Nanofluidic Chips. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 38037241 DOI: 10.1021/acs.langmuir.3c02673] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
Spontaneous imbibition has garnered increasing attention as an attractive mechanism for developing tight reservoirs. Despite valuable insights from previous experiments, there remains a lack of understanding regarding the imbibition process within multiscale nanopore-fracture networks. In this work, we devised an innovative multiscale model incorporating over 105 nanochannels and integrating a microfracture network to explore the complex imbibition behavior in tight formations. Additionally, fracture-free nanomatrix models with low permeability were developed for comparative discussions. The results show that the Lucas-Washburn equation remains valid at the tremendous fracture-free nanopore networks under the confinement of 500 nm, with a relative deviation of ±6%. The nanomatrix's heterogeneity hinders the imbibition rate, resulting in a reduction of 4.6 to 10.8% in the imbibition slope. The viscosity plays a dominant role in the change of imbibition slope as temperature varies. Our experiments also found that the interactions between the nanomatrix and bulk fracture complicate the imbibition process. A single wetting front no longer applies in the nanomatrix-fracture networks. Differing fracture/microchannel connectivity leads to disparities in macroscopic patterns, saturation rates, and flow directions. The spatial arrangement of fractures significantly impacts the imbibition time. Overall, this work based on nanofluidic techniques systematically explores the effects of matrix heterogeneity, temperature, and fractures on the imbibition process. The real-time in situ visualization of fluid distribution in multiscale matrix-fracture systems has been achieved, which offers theoretical guidance for practical engineering applications.
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Affiliation(s)
- Wanjun Qin
- School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yaohao Guo
- School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Linghui Sun
- Development Research Institute, Research Center for Enhanced Oil Recovery of China Petroleum Exploration, Beijing 10083, China
| | - Jiawei Shi
- School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Bo Bao
- School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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4
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Affiliation(s)
- Zheng Sun
- State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Xuzhou China
| | - Suran Wang
- CNOOC Research Institute Co., Ltd. Beijing China
| | - Hao Xiong
- Department of Molecular Biophysics and Biochemistry Yale University New Haven Connecticut USA
| | - Keliu Wu
- State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum (Beijing) Beijing China
| | - Juntai Shi
- State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum (Beijing) Beijing China
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5
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Pan B, Clarkson CR, Atwa M, Tong X, Debuhr C, Ghanizadeh A, Birss VI. Spontaneous Imbibition Dynamics of Liquids in Partially-Wet Nanoporous Media: Experiment and Theory. Transp Porous Media 2021. [DOI: 10.1007/s11242-021-01574-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Nazari M, Davoodabadi A, Huang D, Luo T, Ghasemi H. Transport Phenomena in Nano/Molecular Confinements. ACS NANO 2020; 14:16348-16391. [PMID: 33253531 DOI: 10.1021/acsnano.0c07372] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The transport of fluid and ions in nano/molecular confinements is the governing physics of a myriad of embodiments in nature and technology including human physiology, plants, energy modules, water collection and treatment systems, chemical processes, materials synthesis, and medicine. At nano/molecular scales, the confinement dimension approaches the molecular size and the transport characteristics deviates significantly from that at macro/micro scales. A thorough understanding of physics of transport at these scales and associated fluid properties is undoubtedly critical for future technologies. This compressive review provides an elaborate picture on the promising future applications of nano/molecular transport, highlights experimental and simulation metrologies to probe and comprehend this transport phenomenon, discusses the physics of fluid transport, tunable flow by orders of magnitude, and gating mechanisms at these scales, and lists the advancement in the fabrication methodologies to turn these transport concepts into reality. Properties such as chain-like liquid transport, confined gas transport, surface charge-driven ion transport, physical/chemical ion gates, and ion diodes will provide avenues to devise technologies with enhanced performance inaccessible through macro/micro systems. This review aims to provide a consolidated body of knowledge to accelerate innovation and breakthrough in the above fields.
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Affiliation(s)
- Masoumeh Nazari
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Road, Houston, Texas 77204, United States
| | - Ali Davoodabadi
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Road, Houston, Texas 77204, United States
| | - Dezhao Huang
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Tengfei Luo
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Hadi Ghasemi
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Road, Houston, Texas 77204, United States
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7
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Zhao G, Yao Y, Adenutsi CD, Feng X, Wang L, Wu W. Transport Behavior of Oil in Mixed Wettability Shale Nanopores. ACS OMEGA 2020; 5:31831-31844. [PMID: 33344837 PMCID: PMC7745427 DOI: 10.1021/acsomega.0c04678] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 10/30/2020] [Indexed: 06/12/2023]
Abstract
Shale oil reserves play an important role in the oil & gas industry. The investigation of oil transport behavior in shale nanopores is crucial in the successful exploitation of shale oil reservoirs. However, the transport mechanisms of oil in shale nanopores are still not understood. In this paper, a model for oil transport through a single nanopore was established by considering mixed wettability, surface roughness, varying viscosity, and the effects triggered by adsorbed organic matter. The organic surface ratio of a single nanopore was used to quantify mixed wettability, while the effects of adsorbed organic matter were estimated by the surface coverage and the adsorption thickness. The entire mathematical model was simplified into several equations to discuss the contributions of each mechanism. The results showed that to accurately predict the oil transport properties in mixed wettability shale nanopores, it is necessary to consider varying viscosity, wettability alteration, and the oil molecule structure. Adsorbed organic matter led to increase in oil flow capacity by altering the surface wettability. However, the oil flow capacity was greatly reduced when varying viscosity was considered. Additionally, the contributions of each mechanism varied with the pore type. Furthermore, increasing surface roughness significantly reduced the oil flow capacity in both organic and inorganic nanopores. This work provides a better understanding of oil transport behavior in mixed-wettability shale nanopores and a quantitative framework for future research.
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Affiliation(s)
- Guoxiang Zhao
- College
of Petroleum Engineering, China University
of Petroleum, Beijing 102249, China
| | - Yuedong Yao
- College
of Petroleum Engineering, China University
of Petroleum, Beijing 102249, China
| | - Caspar Daniel Adenutsi
- Core
and Rock Properties Laboratory, Department of Petroleum Engineering,
Faculty of Civil and Geo-Engineering, Kwame
Nkrumah University of Science and Technology, Kumasi AK, Ghana
| | - Xiaolong Feng
- No.1
Oil Production Plant, Changqing Oilfield, PetroChina, Yan’an 716000, China
| | - Lian Wang
- College
of Petroleum Engineering, China University
of Petroleum, Beijing 102249, China
| | - Wenwei Wu
- Ningbo
Fengcheng Advanced Energy Materials Research Institute, Ningbo 315000, China
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8
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Zhang L, Wu K, Chen Z, Li J, Yu X, Yang S, Hui G, Yang M. Quasi-Continuum Water Flow under Nanoconfined Conditions: Coupling the Effective Viscosity and the Slip Length. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c03507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Linyang Zhang
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
| | - Keliu Wu
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
| | - Zhangxin Chen
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
- Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum (Beijing), Beijing 102249, China
| | - Jing Li
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
- Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum (Beijing), Beijing 102249, China
| | - Xinran Yu
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
| | - Sheng Yang
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
| | - Gang Hui
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
| | - Min Yang
- Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
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9
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A New Slip Length Model for Enhanced Water Flow Coupling Molecular Interaction, Pore Dimension, Wall Roughness, and Temperature. ADVANCES IN POLYMER TECHNOLOGY 2019. [DOI: 10.1155/2019/6424012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this paper, a slip length model is proposed to analyze the enhanced flow based on the Hagen–Poiseuille equation. The model considers the multimechanisms including wall-water molecular interactions, pore dimensions, fractal roughness, and temperature. The increasing wall-water interactions result in the greater slip length and flow enhancement factor. The increased temperature enhances the kinetic energy of water molecules that leads to great surface diffusion coefficient and small work of adhesion. The wall roughness can decrease the slip length and flow enhancement factor in hydrophilic nanopores. This work studies the effects of multimechanisms on slip length and flow enhancement factor theoretically, which can accurately describe the liquid flow in nanopores.
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10
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Feng D, Li X, Wang X, Li J, Zhang T, Sun Z, He M, Liu Q, Qin J, Han S, Hu J. Anomalous Capillary Rise under Nanoconfinement: A View of Molecular Kinetic Theory. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7714-7725. [PMID: 29889541 DOI: 10.1021/acs.langmuir.8b01397] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the capillary filling behaviors in nanopores is crucial for many science and engineering problems. Compared with the classical Bell-Cameron-Lucas-Washburn (BCLW) theory, anomalous coefficient is always observed because of the increasing role of surfaces. Here, a molecular kinetics approach is adopted to explain the mechanism of anomalous behaviors at the molecular level; a unified model taking account of the confined liquid properties (viscosity and density) and slip boundary condition is proposed to demonstrate the macroscopic consequences, and the model results are successfully validated against the published literature. The results show that (1) the effective viscosity induced by the interaction from the pore wall, as a function of wettability and the pore dimension (nanoslit height or nanotube diameter), may remarkably slow down the capillary filling process more than theoretically predicted. (2) The true slip, where water molecules directly slide on the walls, strongly depends on the wettability and will increase as the contact angle increases. In the hydrophilic nanopores, though, the magnitude may be comparable with the pore dimensions and promote the capillary filling compared with the classical BCLW model. (3) Compared with the other model, the proposed model can successfully predict the capillary filling for both faster or slower capillary filling process; meanwhile, it can capture the underlying physics behind these behaviors at the molecular level based on the effective viscosity and slippage. (4) The surface effects have different influence on the capillary filling in nanoslits and nanotubes, and the relative magnitude will change with the variation of wettability as well as the pore dimension.
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Affiliation(s)
- Dong Feng
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
- MOE Key Laboratory of Petroleum Engineering , China University of Petroleum (Beijing) , Beijing 102249 , P. R. China
| | - Xiangfang Li
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
- MOE Key Laboratory of Petroleum Engineering , China University of Petroleum (Beijing) , Beijing 102249 , P. R. China
| | - Xiangzeng Wang
- Shaanxi Yanchang Petroleum (Group) Corp. Ltd. , Xi'an 710075 , P. R. China
| | - Jing Li
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
- Chemical and Petroleum Engineering , University of Calgary , Calgary , Alberta T2N1N4 , Canada
| | - Tao Zhang
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
| | - Zheng Sun
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
| | - Minxia He
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
| | - Qing Liu
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
| | - Jiazheng Qin
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
| | - Song Han
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
| | - Jinchuan Hu
- State Key Laboratory of Petroleum Resources and Engineering in China , University of Petroleum at Beijing , Beijing 102249 , P. R. China
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11
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Kelly S, Torres-Verdín C, Balhoff MT. Influences of polarity and hydration cycles on imbibition hysteresis in silica nanochannels. Phys Chem Chem Phys 2018; 20:456-466. [DOI: 10.1039/c7cp05833k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Liquid imbibition experiments in 2D silica nanochannels reveal insights into the impact of hydrophilicity and liquid polarity on the hydrodynamic “no slip” boundary condition and nanoscale imbibition behavior.
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Affiliation(s)
- Shaina Kelly
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin
- Austin
- USA
- Contribution from the Center for Nano- and Molecular Science
- The University of Texas at Austin
| | - Carlos Torres-Verdín
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin
- Austin
- USA
| | - Matthew T. Balhoff
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin
- Austin
- USA
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12
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Shaat M. Viscosity of Water Interfaces with Hydrophobic Nanopores: Application to Water Flow in Carbon Nanotubes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12814-12819. [PMID: 29035046 DOI: 10.1021/acs.langmuir.7b02752] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The nanoconfinement of water results in changes in water properties and nontraditional water flow behaviors. The determination of the interfacial interactions between water and hydrophobic surfaces helps in understanding many of the nontraditional behaviors of nanoconfined water. In this study, an approach for the identification of the viscosity of water interfaces with hydrophobic nanopores as a function of the nanopore diameter and water-solid (nanopore) interactions is proposed. In this approach, water in a hydrophobic nanopore is represented as a double-phase water with two distinct viscosities: water interface and water core. First, the slip velocity to pressure gradient ratio of water flow in hydrophobic nanopores is obtained via molecular dynamics (MD) simulations. Then the water interface viscosity is determined via a pressure gradient-based bilayer water flow model. Moreover, the core viscosity and the effective viscosity of water flow in hydrophobic nanopores are derived as functions of the nanopore diameter and water-solid interactions. This approach is utilized to report the interface viscosity, core viscosity, and effective viscosity of water flow in carbon nanotubes (CNTs) as functions of the CNT diameter. Moreover, using the proposed approach, the transition from MD to continuum mechanics is revealed where the bulk water properties are recovered for large CNTs.
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Affiliation(s)
- M Shaat
- Department of Mechanical and Aerospace Engineering, New Mexico State University , Las Cruces, New Mexico 88003, United States
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13
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Speyer K, Pastorino C. Droplet Transport in a Nanochannel Coated by Hydrophobic Semiflexible Polymer Brushes: The Effect of Chain Stiffness. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10753-10763. [PMID: 28892398 DOI: 10.1021/acs.langmuir.7b02640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We study the influence of chain stiffness on droplet flow in a nanochannel, coated with semiflexible hydrophobic polymers by means of nonequilibrium molecular dynamics simulations. The studied system is then a moving droplet in the slit channel, coexisting with its vapor and subjected to periodic boundary conditions in the flow direction. The polymer chains, grafted by the terminal bead to the confining walls, are described by a coarse-grained model that accounts for chain connectivity, excluded volume interactions and local chain stiffness. The rheological, frictional and dynamical properties of the brush are explored over a wide range of persistence lengths. We find a rich behavior of polymer conformations and concomitant changes in the friction properties over the wide range of studied polymer stiffnesses. A rapid decrease in the droplet velocity was observed as the rigidity of the chains is increased for polymers whose persistence length is smaller than their contour length. We find a strong relation between the internal dynamics of the brush and the droplet transport properties, which could be used to tailor flow properties by surface functionalization. The monomers of the brush layer, under the droplet, present a collective "treadmill belt" like dynamics which can only be present due the existence of grafted chains. We describe its changes in spatial extension upon variations of polymer stiffness, with bidimensional velocity and density profiles. The deformation of the polymer brushes due to the presence of the droplet is analyzed in detail. Lastly, the droplet-gas interaction is studied by varying the liquid to gas ratio, observing a 16% speed increase for droplets that flow close to each other, compared to a train of droplets that present a large gap between consecutive droplets.
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Affiliation(s)
- K Speyer
- Departamento de Física de la Materia Condensada, Centro Atómico Constituyentes, CNEA , Av.Gral. Paz 1499, 1650 Pcia. de Buenos Aires, Argentina
- CONICET , Godoy Cruz 2290 (C1425FQB) Buenos Aires, Argentina
| | - C Pastorino
- Departamento de Física de la Materia Condensada, Centro Atómico Constituyentes, CNEA , Av.Gral. Paz 1499, 1650 Pcia. de Buenos Aires, Argentina
- CONICET , Godoy Cruz 2290 (C1425FQB) Buenos Aires, Argentina
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14
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Abstract
Understanding and controlling the flow of water confined in nanopores has tremendous implications in theoretical studies and industrial applications. Here, we propose a simple model for the confined water flow based on the concept of effective slip, which is a linear sum of true slip, depending on a contact angle, and apparent slip, caused by a spatial variation of the confined water viscosity as a function of wettability as well as the nanopore dimension. Results from this model show that the flow capacity of confined water is 10-1∼107 times that calculated by the no-slip Hagen-Poiseuille equation for nanopores with various contact angles and dimensions, in agreement with the majority of 53 different study cases from the literature. This work further sheds light on a controversy over an increase or decrease in flow capacity from molecular dynamics simulations and experiments.
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15
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Bao B, Zandavi SH, Li H, Zhong J, Jatukaran A, Mostowfi F, Sinton D. Bubble nucleation and growth in nanochannels. Phys Chem Chem Phys 2017; 19:8223-8229. [PMID: 28271101 DOI: 10.1039/c7cp00550d] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We apply micro- and nanofluidics to study fundamental phase change behaviour at nanoscales, as relevant to shale gas/oil production. We investigate hydrocarbon phase transition in sub-100 nm channels under conditions that mimic the pressure drawdown process. Measured cavitation pressures are compared with those predicted from the nucleation theory. We find that cavitation pressure in the nanochannels corresponds closer to the spinodal limit than that predicted from classical nucleation theory. This deviation indicates that hydrocarbons remain in the liquid phase in nano-sized pores under pressures much lower than the saturation pressure. Depending on the initial nucleation location - along the channel or at the end - two types of bubble growth dynamics were observed. Bubble growth was measured experimentally at different nucleation conditions, and results agree with a fluid dynamics model including evaporation rate, instantaneous bulk liquid velocity, and bubble pressure. Collectively these results demonstrate, characterize, and quantify isothermal bubble nucleation and growth of a pure substance in nanochannels.
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Affiliation(s)
- Bo Bao
- Department of Mechanical and Industrial Engineering, University of Toronto, M5S3G8, Canada.
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16
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Kelly SA, Torres-Verdín C, Balhoff MT. Subsurface to substrate: dual-scale micro/nanofluidic networks for investigating transport anomalies in tight porous media. LAB ON A CHIP 2016; 16:2829-2839. [PMID: 27386956 DOI: 10.1039/c6lc00613b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Micro/nanofluidic experiments in synthetic representations of tight porous media, often referred to as "reservoir-on-a-chip" devices, are an emerging approach to researching anomalous fluid transport trends in energy-bearing and fluid-sequestering geologic porous media. We detail, for the first time, the construction of dual-scale micro/nanofluidic devices that are relatively large-scale, two-dimensional network representations of granular and fractured nanoporous media. The fabrication scheme used in the development of the networks on quartz substrates (master patterns) is facile and replicable: transmission electron microscopy (TEM) grids with lacey carbon support film were used as shadow masks in thermal evaporation/deposition and reactive ion etch (RIE) was used for hardmask pattern transfer. The reported nanoscale network geometries are heterogeneous and composed of hydraulically resistive paths (throats) meeting at junctures (pores) to mimic the low topological connectivity of nanoporous sedimentary rocks such as shale. The geometry also includes homogenous microscale grid patterns that border the nanoscale networks and represent microfracture pathways. Master patterns were successfully replicated with a sequence of polydimethylsiloxane (PDMS) and Norland Optical Adhesive (NOA) 63 polymers. The functionality of the fabricated quartz and polymer nanofluidic devices was validated with aqueous imbibition experiments and differential interference contrast microscopy. These dual-scale fluidic devices are promising predictive tools for hypothesis testing and calibration against bulk fluid measurements in tight geologic, biologic, and synthetic porous material of similar dual-scale pore structure. Applications to shale/mudrock transport studies in particular are focused on herein.
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Affiliation(s)
- Shaina A Kelly
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, 200 E. Dean Keeton, Austin, TX 78712, USA.
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17
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Kelly S, Torres-Verdín C, Balhoff MT. Anomalous liquid imbibition at the nanoscale: the critical role of interfacial deformations. NANOSCALE 2016; 8:2751-2767. [PMID: 26762813 DOI: 10.1039/c5nr04462f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We observed that imbibition of various Rhodamine B-doped wetting liquids in an array of different-sized, horizontal, two-dimensional silica nanochannels terminated within the channels as a function of hydraulic diameter and liquid type. This front termination is not predicted by the classic Washburn equation for capillary flow, which establishes diffusive dynamics in horizontal channels. Various explanations for the anomalous static imbibition measurements were negated; hydrodynamics, thermodynamics, surface chemistry and mechanics were all taken into consideration for this analysis. The atypical imbibition data are explained by deformed menisci and decreased effective channel diameters. These occurrences are due to the enhanced influence of the following phenomena at the nanoscale: surface forces at fluid-solid boundaries, the presence of quasi-crystalline thin films or boundary regions, and potential solid surface or boundary layer deformation due to meniscus-induced negative pressures (suction). We introduce a phenomenological model which demonstrates how van der Waals forces, common to all interfaces, lead to local menisci deformation and an average reduction in capillary pressure. An expression for the approximate capillary pressure of a symmetric nanoscale meniscus in a cylindrical pore space is derived; its difference from the macroscopic capillary pressure can be expressed by an effective contact angle. Precursor films, adsorbed films and elastocapillary deformation decrease effective diameter, exacerbating meniscus deformation and increases in effective viscosity; we also describe local models and effective values for these phenomena. The findings can be scaled to imbibition and two-phase flow in nanoporous media.
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Affiliation(s)
- Shaina Kelly
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Carlos Torres-Verdín
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Matthew T Balhoff
- Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
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18
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Ye Z, Li S, Wang C, Shen R, Wen W. Capillary flow control in nanochannels via hybrid surface. RSC Adv 2016. [DOI: 10.1039/c5ra22033e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report a simple and effective approach to control the speed of capillary flow in nanochannels in a quantitative manner.
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Affiliation(s)
- Ziran Ye
- Department of Physics
- The Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Shunbo Li
- School of Chemistry
- University of Leeds
- Leeds
- UK
| | - Cong Wang
- Department of Physics
- The Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Rong Shen
- Institute of Physics
- Chinese Academy of Sciences
- Beijing
- China
| | - Weijia Wen
- Department of Physics
- The Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
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