Investigation of the self-propulsion of a wetting/nonwetting ganglion in tapered capillaries with arbitrary viscosity and density contrasts

Salama, Amgad; Kou, Jisheng; Dawoud, Belal; Rady, Mohamed Y.; Morshedy, Salah El

doi:10.1016/j.colsurfa.2023.131151

Cited by 5 publications

(10 citation statements)

References 50 publications

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“…The wetting ganglion would move towards the tapered end of the tube while the nonwetting one towards the wider end (Reproduced with permission. 102 Copyright 2023, Elsevier). (B) The geometrical model used to investigate the dynamic behavior of capillary pressure at the junction of converging-uniform capillary.…”

Section: Model Systemmentioning

confidence: 99%

“…99 For instance, there have been efforts to comprehend the movement of the liquid meniscus in capillary channels (Figure 6) through theoretical works and simulations. [100][101][102] These studies utilize models with simple geometric structures, which provide fundamental insights into fluid transport in capillary channels. In experiments, an ideal model system is also highly desirable to facilitate the comprehension of mass transport and separation behavior.…”

Section: Model Systemmentioning

confidence: 99%

“…Capillary imbibition has been a significant topic for the past century, 95–98 but numerous aspects of this issue still remain unresolved 99 . For instance, there have been efforts to comprehend the movement of the liquid meniscus in capillary channels (Figure 6) through theoretical works and simulations 100–102 . These studies utilize models with simple geometric structures, which provide fundamental insights into fluid transport in capillary channels.…”

Section: Application Of Ppmvsmentioning

confidence: 99%

“…(A) The three‐dimensional representation of a wetting/nonwetting ganglion entrapped in a tapered capillary tube. The wetting ganglion would move towards the tapered end of the tube while the nonwetting one towards the wider end (Reproduced with permission 102 . Copyright 2023, Elsevier).…”

Section: Application Of Ppmvsmentioning

confidence: 99%

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A mini‐review of polymeric porous membranes with vertically penetrative pores

Yang,

Chai,

Zhang

et al. 2023

Journal of Polymer Science

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Membrane separation technology plays a pivotal role in modern industry and scientific research. The key to developing and improving membrane separation processes lies in designing and fabricating customized porous membranes with specific physical parameters, including pore diameter, porosity, pore size distribution, pore length (membrane thickness), pore geometry, and pore connectivity. Polymeric porous membranes with vertically‐penetrative‐pores (PPMVs) represent a distinct category among the available membranes due to their unique characteristics such as short transport path, small trans‐membrane resistance, and simple pore geometry, as compared to other porous membranes with sponge‐like channels. In practical applications, PPMVs offer several advantages, including achieving higher flux rates, facilitating easier unidirectional transport, and enabling harmless biological extraction. Moreover, PPMVs can serve as ideal model systems for theoretical investigations on the fundamental mechanisms of separation and transport in academic research. With substantial advancements in fabrication technologies and application fields of PPMVs in recent years, it warrants a comprehensive perspective. In this mini‐review, we provide an overview of widely used fabrication methods for PPMVs, discuss their primary applications, and address the existing challenges and opportunities.

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Section: Model Systemmentioning

confidence: 99%

Section: Model Systemmentioning

confidence: 99%

Section: Application Of Ppmvsmentioning

confidence: 99%

Section: Application Of Ppmvsmentioning

confidence: 99%

See 2 more Smart Citations

A mini‐review of polymeric porous membranes with vertically penetrative pores

Yang,

Chai,

Zhang

et al. 2023

Journal of Polymer Science

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“…In addition, extensive modeling approaches have been developed that predict the dynamic behavior of the meniscus as it moves along the tube in different setups. − Several other cases have also been explored including tapered capillary tubes, − corrugated tubes, nonuniform tubes, noncircular conduits, ,− and several others. A subset of these collections concerns the dynamics of trapped ganglia in capillary tubes. − The dynamics of a trapped wetting and nonwetting ganglia in tapered tubes under capillary action reveal that a wetting slug will always move toward the narrower end of the tube and a nonwetting slug will move conversely toward the wider end. The interesting thing with respect to nonwetting ganglia in tapered tubes is that there exists an equilibrium state where their motion asymptotically ceases.…”

Section: Introductionmentioning

confidence: 99%

Fates of a Nonwetting Slug in Tapered Microcapillaries under Gravity and Zero Gravity Conditions: Dynamics, Asymptotic Equilibrium Analysis, and Computational Fluid Dynamics Verifications

Salama,

Kou,

El Amin

2024

Langmuir

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It has been determined experimentally and numerically that a nonwetting slug in a tapered capillary tube, under the sole action of capillary force, self-propels itself toward the wider end of the tube until an equilibrium state is reached. The aim of this work is to highlight the state of the slug at equilibrium in terms of configuration and location. Furthermore, it turns out that gravity adds richness to this phenomenon, and more fates become possible. A modified Bond number is developed that determines the relative importance of gravity and capillarity for this system. According to the magnitude of the Bond number, three more fates are possible. Therefore, in a tapered capillary tube held vertically upward with its wider end at the top, in the absence of gravity or under microgravity conditions, the nonwetting slug moves upward toward the wider end of the tube until it reaches equilibrium with the two menisci part of a single sphere. The location of the slug at equilibrium in this case represents the farthest fate among the other fates. When gravity exists yet capillarity dominates, the slug still moves upward toward the wider end. However, in this case, the two menisci become parts of two different spheres of different curvatures. For this scenario, the slug climbs upward but reaches a lower level compared to the previous scenario. On the other hand, when gravity dominates, the slug experiences a net downward pull toward the narrower end of the tube and starts to move in the direction of gravity until capillary force establishes a balance, then it stops. When gravity sufficiently dominates, it pulls the slug downward until it completely drains off the tube. A computational fluid dynamics (CFD) analysis is conducted in order to build a framework for verification exercises. Excellent agreements between the results of the developed model and the CFD analysis are obtained. A fate map and a scheme are developed to identify these four fates based on two Bond numbers; namely, the initial Bond number and that associated with the slug when it is at the exit.

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Investigation of the Filling of a Spherical Pore Body with a Nonwetting Fluid: A Modeling Approach and Computational Fluid Dynamics analysis

Salama,

Kou,

Sun

et al. 2024

Transp Porous Med

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Understanding the dynamics of the filling process of a pore body with a nonwetting fluid is important in the context of dynamic pore network models and others. It can justify many of the assumptions behind the different rules that describe how the network behaves during imbibition and drainage processes. It also provides insight into the different regimes pertinent to this system. The filling process starts with the contact line pinning at the pore entrance. Three regimes can be identified during the filling process that is related to how the contact line advances. In the first two regimes, the contact line pins at the pore entrance while the emerging droplet develops, and in the third one, the contact line departs the entrance of the pore and advances along the pore surface. During the first regime, which is brief, the curvature of the meniscus increases, and likewise, the corresponding capillary pressure, while in the other two regimes, the curvature decreases and so does the capillary pressure. Such behavior results in the rate at which the nonwetting fluid invades the pore to change. It initially decreases, then increases as the meniscus advances. The radius of curvature of the meniscus, eventually, increases to infinity for which the interface assumes a flat configuration. A one-dimensional modeling approach is developed that accounts for all these regimes. The model also considers the two immiscible fluids over a wide spectrum of contrast in viscosity. Information about the mean velocity of the invading fluid, the location of the contact line, the radius of curvature of the meniscus, the volume of the emerging droplet, and several others are among the details that the model provides. A computational fluid dynamics (CFD) simulation has also been considered to confirm the proposed fates of the interface and to provide a framework for comparisons. The results of the validation process show, generally, a very good match between the model and the CFD analysis.

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Investigation of the self-propulsion of a wetting/nonwetting ganglion in tapered capillaries with arbitrary viscosity and density contrasts

Cited by 5 publications

References 50 publications

A mini‐review of polymeric porous membranes with vertically penetrative pores

A mini‐review of polymeric porous membranes with vertically penetrative pores

Fates of a Nonwetting Slug in Tapered Microcapillaries under Gravity and Zero Gravity Conditions: Dynamics, Asymptotic Equilibrium Analysis, and Computational Fluid Dynamics Verifications

Investigation of the Filling of a Spherical Pore Body with a Nonwetting Fluid: A Modeling Approach and Computational Fluid Dynamics analysis

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