Poiseuille flow in a nano channel for different wall surface patterns

Zhang, Yongbin

doi:10.1016/j.ijheatmasstransfer.2015.12.006

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…Such a difference disappears as the production proceeds. Although the boundary slip strengthens as the pore radius decreases, 56 the difference made by the boundary slip is unnoticeable compared with the aforementioned dynamic effect and the boundary layer. This indicates that the boundary slip is less dominant to affect the fluid flow in tight rock compared with the boundary layer and can be neglected when predicting production.…”

Section: Resultsmentioning

confidence: 99%

Two-Phase Fluid Flow Characterizations in a Tight Rock: A Fractal Bundle of the Capillary Tube Model

Liu¹,

Li²,

Chen

et al. 2019

Ind. Eng. Chem. Res.

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The multiphase fluid flow in the tight rocks can be affected by the existence of the dynamic effect, boundary slip, and boundary layer. In this work, a fractal bundle of the capillary tube model is proposed to incorporate the above-mentioned factors into the two-phase fluid flow characterization in tight porous media. The model has been successfully validated by the experimental data from core-flooding tests, demonstrating its effectiveness to describe the production behavior in tight reservoirs. In addition, sensitivity analysis is conducted to quantify the effects of the dynamic effect, boundary slip, boundary layer, and injection pressure on the oil recovery of the tight formations. Results indicate that the dynamic effect and boundary layer should be taken into consideration when predicting the production behavior, while the boundary slip can be neglected. The predicted recovery can be as high as 23% higher than its actual value if neglecting the dynamic effect while the existence of the boundary layer can decrease the oil recovery by up to 7%.

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Section: Resultsmentioning

confidence: 99%

Two-Phase Fluid Flow Characterizations in a Tight Rock: A Fractal Bundle of the Capillary Tube Model

Liu¹,

Li²,

Chen

et al. 2019

Ind. Eng. Chem. Res.

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“…However, in this study, the hydrophilic surface is employed to promote membrane separation properties (Section S5 in the Supporting Information). Particularly, membranes with conical nanochannels were manipulated, which minimize viscous dissipation by the shallow grooves on SGO nanosheet surfaces to minimize liquid–solid friction inside nanochannels (friction would slow down fluid velocity near the liquid–solid interface and viscous dissipation is generated) …”

Section: Resultsmentioning

confidence: 99%

“…Herein, inspired by the hourglass structure and ultrafast water transport in aquaporins, we exploit a novel approach to fabricating membranes with conical nanochannels to break the selectivity/permeability trade-off. , In this case, the optimized friction at the interface of the fluid–solid wall would significantly decrease the steric hindrance and thus mass transfer resistance. ,, Furthermore, when liquid–vapor interfaces are generated inside conical nanochannels, the reduced steric hindrance would facilitate the generation of Laplace pressure, which can act as the internal driving force to further elevate mass transfer rate and membrane separation properties …”

Section: Introductionmentioning

confidence: 99%

“…27,55 In this case, the optimized friction at the interface of the fluid−solid wall would significantly decrease the steric hindrance and thus mass transfer resistance. 27,28,55 Furthermore, when liquid−vapor interfaces are generated inside conical nanochannels, the reduced steric hindrance would facilitate the generation of Laplace pressure, which can act as the internal driving force to further elevate mass transfer rate and membrane separation properties. 29 ■ RESULTS AND DISCUSSION Fabrication of Graphene Oxide Membranes with Conical Nanochannels.…”

Section: ■ Introductionmentioning

confidence: 99%

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Graphene Oxide Membranes with Conical Nanochannels for Ultrafast Water Transport

Shi

et al. 2018

ACS Appl. Mater. Interfaces

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Membrane-based separations have been increasingly utilized to address global energy crisis and water scarcity. However, the separation efficiency often suffers from the trade-off between membrane permeability and selectivity. Although great efforts have been devoted, a membrane with both high permeability and high selectivity remains a distant prospect. Inspired by the hourglass structure and ultrafast water transport in aquaporins, we propose a novel approach to fabricating membranes with conical nanochannels to reduce the mass transfer resistance and to introduce Laplace pressure as the internal driving force, which successfully breaks the permeability/selectivity trade-off. First, sulfonated polyaniline (SPANI) nanorods were in situ-synthesized and vertically aligned on sulfonated graphene oxide (SGO) nanosheets, forming SGO–SPANI X composites. Then, the graphene oxide (GO) membranes were fabricated by assembling SGO–SPANI X composites through pressure-assisted filtration, in which the SPANI nanorods would bend and flatten on the SGO nanosheets under low shear force, forming stripe arrays on SGO nanosheets. The tilted stripe arrays between the adjacent SGO nanosheets form the conical nanochannels inside GO membranes. The conical nanochannels significantly decreased the steric hindrance and enabled the generation of Laplace pressure as the internal driving force within membranes. Consequently, the resulting membranes exhibit an ultrahigh water permeability of 1222.77 L·m–2·h–1·bar–1 and high efficiency in dye removal from water with a rejection of 90.44% and permeability of 528 L·m–2·h–1·bar–1.

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“…The flow rate was generated thermally, due to the direct relation of the mass flow rate and increased temperature. Cubaud et al (2016) have examined the behavior of threads of viscous fluids, influence of fluid injection schemes, and flow rates experimentally [ 14 ]. Law et al (2014) investigated the increased heat flux flow rate in oblique-finned channels [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Simulation, Fabrication and Analysis of Silver Based Ascending Sinusoidal Microchannel (ASMC) for Implant of Varicose Veins

et al. 2017

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Bioengineered veins can benefit humans needing bypass surgery, dialysis, and now, in the treatment of varicose veins. The implant of this vein in varicose veins has significant advantages over the conventional treatment methods. Deep vein thrombosis (DVT), vein patch repair, pulmonary embolus, and tissue-damaging problems can be solved with this implant. Here, the authors have proposed biomedical microdevices as an alternative for varicose veins. MATLAB and ANSYS Fluent have been used for simulations of blood flow for bioengineered veins. The silver based microchannel has been fabricated by using a micromachining process. The dimensions of the silver substrates are 51 mm, 25 mm, and 1.1 mm, in length, width, and depth respectively. The dimensions of microchannels grooved in the substrates are 0.9 mm in width and depth. The boundary conditions for pressure and velocity were considered, from 1.0 kPa to 1.50 kPa, and 0.02 m/s to 0.07 m/s, respectively. These are the actual values of pressure and velocity in varicose veins. The flow rate of 5.843 (0.1 nL/s) and velocity of 5.843 cm/s were determined at Reynolds number 164.88 in experimental testing. The graphs and results from simulations and experiments are in close agreement. These microchannels can be inserted into varicose veins as a replacement to maintain the excellent blood flow in human legs.

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Poiseuille flow in a nano channel for different wall surface patterns

Cited by 14 publications

References 20 publications

Two-Phase Fluid Flow Characterizations in a Tight Rock: A Fractal Bundle of the Capillary Tube Model

Two-Phase Fluid Flow Characterizations in a Tight Rock: A Fractal Bundle of the Capillary Tube Model

Graphene Oxide Membranes with Conical Nanochannels for Ultrafast Water Transport

Simulation, Fabrication and Analysis of Silver Based Ascending Sinusoidal Microchannel (ASMC) for Implant of Varicose Veins

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