Controlled liquid entrapment over patterned sidewalls in confined geometries

Gupta, Ankur; Lee, Hyundo; Doyle, Patrick S.

doi:10.1103/physrevfluids.2.094007

Cited by 10 publications

(17 citation statements)

References 41 publications

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“…However, for the same capillary number, change in Re does not affect the release, as discussed in our prior work. 19 For simplicity, we do not vary the viscosity ratio μ o /μ w , which also affects this system. 19 Therefore, the critical dimensionless number here is Ca.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…19 For simplicity, we do not vary the viscosity ratio μ o /μ w , which also affects this system. 19 Therefore, the critical dimensionless number here is Ca.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As water flows inside the microchannel, oil is trapped in the triangular troughs because of wetting and geometric effects (Figure b). We refer the readers to our previous work, where we analyze the oil displacement process and predict the amount of oil entrapped using geometric arguments . After the oil entrapment step, we flood the channel with 5 wt % SDS solution with speed varying from U = 9–700 mm/s to recover the trapped oil (Figure c).…”

Section: Materials and Methodsmentioning

confidence: 99%

“…17 We also showed that by controlling the geometry of photopatterned obstacles and sidewalls, a water flood can be utilized to trap oil in varying amounts. 18,19 Here, we use the same approach to trap the oil phase in triangular patterned structures. Next, we examine the release of entrapped oil through a surfactant flood.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In this study, we build upon our previously developed micromodel approach that provides full control over designing geometrical features with tailored wetting properties . We also showed that by controlling the geometry of photopatterned obstacles and sidewalls, a water flood can be utilized to trap oil in varying amounts. , Here, we use the same approach to trap the oil phase in triangular patterned structures. Next, we examine the release of entrapped oil through a surfactant flood.…”

Section: Introductionmentioning

confidence: 99%

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Oil Recovery from Micropatterned Triangular Troughs during a Surfactant Flood

2018

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We study the recovery of oil trapped inside micropatterned triangular troughs after injecting a surfactant solution. In our experiments, we track the trapped oil volume with duration of surfactant flood for different capillary numbers. We observe that the capillary number affects the amount of oil recovered as the well as the rate of oil recovery. We employ multiphase flow simulations to analyze our system and show a qualitative agreement between the simulations and experimental results. We also discover that beyond a capillary number, the volume of oil recovered plateaus, and no additional oil is released with an increase in capillary number. We develop a theoretical model to predict the dependence of maximum oil recovery on geometrical features and find that the theoretical predictions compare favorably with the trends obtained from our simulations. Though approximate, theoretical relation provides insights into the efficiency of oil recovery and can be utilized to understand the effect of sharp bends and dead ends in enhanced oil recovery and soil remediation.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…19 For simplicity, we do not vary the viscosity ratio μ o /μ w , which also affects this system. 19 Therefore, the critical dimensionless number here is Ca.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Materials and Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oil Recovery from Micropatterned Triangular Troughs during a Surfactant Flood

2018

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Wetting Effect on Patterned Substrates

Wang

Nestler

2023

Advanced Materials

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A droplet deposited on a solid substrate leads to the wetting phenomenon. A natural observation is the lotus effect, known for its superhydrophobicity. This special feature is engendered by the structured microstructure of the lotus leaf, namely, surface heterogeneity, as explained by the quintessential Cassie-Wenzel theory (CWT). In this work, recent designs of functional substrates are overviewed based on the CWT via manipulating the contact area between the liquid and the solid substrate as well as the intrinsic Young's contact angle. Moreover, the limitation of the CWT is discussed. When the droplet size is comparable to the surface heterogeneity, anisotropic wetting morphology often appears, which is beyond the scope of the Cassie-Wenzel work. In this case, several recent studies addressing the anisotropic wetting effect on chemically and mechanically patterned substrates are elucidated. Surface designs for anisotropic wetting morphologies are summarized with respect to the shape and the arrangement of the surface heterogeneity, the droplet volume, the deposition position of the droplet, as well as the mean curvature of the surface heterogeneity. A thermodynamic interpretation for the wetting effect and the corresponding open questions are presented at the end.

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Dynamic evolution of oil–water interface during displacement in microcavities

Shen

Lin

et al. 2023

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Controlled liquid entrapment over patterned sidewalls in confined geometries

Cited by 10 publications

References 41 publications

Oil Recovery from Micropatterned Triangular Troughs during a Surfactant Flood

Oil Recovery from Micropatterned Triangular Troughs during a Surfactant Flood

Wetting Effect on Patterned Substrates

Dynamic evolution of oil–water interface during displacement in microcavities

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