Continuous separation of oil/water mixture by a double-layer corrugated channel structure with superhydrophobicity and superoleophilicity

Luo, Qiuxian; Xu, Rui; Wang, Keke; He, Jilin; Liu, Changjun; Wu, Pan

doi:10.1016/j.seppur.2021.118647

Cited by 21 publications

(10 citation statements)

References 43 publications

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“…It is natural to develop a continuous separation process based on complete demulsification by PU/diatomite to separate the coalesced water and oil phases. Here, an oil/water separator with a superhydrophobic double-layer corrugated channel (DCC) structure 43 is connected to the suction filtration device using a peristaltic pump to form a demulsification and separation device (DSD) for complete emulsion separation (Figure S16).…”

Section: Resultsmentioning

confidence: 99%

“…The oil fouling of superwetted porous materials is inevitable in coalescence modes regardless of whether superhydrophobic or underwater superoleophobic materials are employed. , Oily substances passing through the microchannels of a porous superwetted material are attracted by the surface or hindered by the complicated structure, causing oil accumulation and increased penetration resistance. The negative effects of oil fouling can be decreased by accurately tuning the wettability to obtain membranes with an intermediate affinity for oil and water, , combining a catalytic process for the self-cleaning of the membrane, − or employing a Janus membrane by combining superhydrophobicity and superhydrophilicity. ,− However, these methods usually complicate the preparation procedure, decrease the applicability, and increase the operating cost.…”

Section: Introductionmentioning

confidence: 99%

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Universal Rapid Demulsification by Vacuum Suction Using Superamphiphilic and Underliquid Superamphiphobic Polyurethane/Diatomite Composites

Luo

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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A process for universal rapid demulsification by vacuum suction using an as-prepared superamphiphilic and underliquid superamphiphobic polyurethane (PU)/diatomite composite has been developed and is used to demulsify kerosene-in-water and water-inkerosene emulsions with and without a surfactant. The results show that the demulsification rate of all the emulsions exceeds 98.5% in longterm operation, with a stable demulsification speed exceeding 0.303 L/ m 2 min. When a superhydrophobic channel for separation is added, the oil/water separation efficiency exceeds 99.0%, and the final products are qualified oil and water. This attractive universal demulsification capability of PU/diatomite originates from its underliquid superamphiphobicity, which attracts a continuous phase to form a stable liquid film and thus repels dispersed phase droplets, which have a similar interaction with the surface but are much less abundant. The vacuum forces emulsion droplets into the microstructure of the PU/diatomite cake, where they are compressed, coalesce, and finally demulsified. This observed mechanism suggests a promising strategy to avoid the negative effects of oil fouling in demulsification and achieve large-scale universal continuous rapid demulsification.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Universal Rapid Demulsification by Vacuum Suction Using Superamphiphilic and Underliquid Superamphiphobic Polyurethane/Diatomite Composites

Luo

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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“…In flexographic printing, they control ink thickness [10,11]; in food processing, they ensure uniform coating [12,13]; in polymer processing, corrugated channels are used in extrusion and injection molding processes where they optimize flow [14,15]; in oil and gas, they enhance transportation efficiency [16]. They are also crucial in biomedical drug delivery systems [17] and wastewater treatment [18][19][20][21]. The recirculation formed in corrugation valleys enhances heat transfer [22], offering valuable insights into fluid dynamics and heat transfer properties, essential for industrial system optimization.…”

Section: Introductionmentioning

confidence: 99%

Scaling Laws for Optimal Power-Law Fluid Flow within Converging-Diverging Dendritic Networks of Tubes and Rectangular Channels

Garg

2024

Preprint

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Power-law fluid flows in the converging-diverging tubes and rectangular channel are prevalent in engineered microfluidic devices, many industrial processes and heat transfer applications. We analyzed optimal flow conditions and network structures for power-law fluids in linear, parabolic, hyperbolic, hyperbolic cosine and sinusoidal converging-diverging dendritic networks of tubes and rectangular channels, and aiming to maximize flow conductance under volume and surface-area constraints. This model shed light on strategies to achieve efficient fluid transport within these complex dendritic networks. Our study focused on steady, incompressible, 2D planar and axisymmetric laminar flow without considering network losses. We found that the flow conductance is highly sensitive to network geometry. The maximum conductance occurs when a specific radius/channel-height ratio $\beta$ is achieved. This value depends on the constraint as well as on the vessel geometry such as tube or rectangular channel. However independent of the kind of the converging-diverging profile along the length of the vessel. We found that the scaling, i.e., $\beta_{\max}^* = \beta_{\min}^* = N^{-1/3}$ for constrained tube volume and $\beta_{\max}^* = \beta_{\min}^*= N^{-(n+1)/(3n+2)}$ for constrained surface area for all converging-diverging tube-networks profile remains the same as found by \citet{garg2024scaling} for the power-law fluid flow in a uniform tube. Here, $\beta_{\max}^*,~ \beta_{\min}^*$ are the radius ratios of daughter-parent pair at the maximum divergent part or minimum convergent part of the vessel. $N$ represents the number of branches splitting at each junction, and $n$ is the power-law index of the fluid. Further, we found that the optimal flow scaling for the height ratio in the rectangular channel, i.e., $\beta_{\max}^* = \beta_{\min}^* = N^{-1/2} \alpha^{-1/2}$ for constrained tube volume and $\beta_{\max}^* = \beta_{\min}^*= N^{-1/2} \alpha^{-n/(2n+2)}$ for constrained surface area for all converging-diverging channel-networks, respectively, where $\alpha$ is the channel-width ratio between parent and daughter branches. We validated our results with experiments, existing theory for limiting conditions, and extended Hess-Murray's law to encompass shear-thinning and shear-thickening fluids for any branching number $N$.

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“…The superhydrophobic surface has the characteristics of slowing down the rate of scaling, which provides a way to realize the above goal. , Superhydrophobic surfaces refer to materials with a water contact angle (WCA) higher than 150° and a roll angle (RA) less than 10°, which have been widely studied by scholars. Studies have shown that the superhydrophobic materials have the properties of anti-icing, , anticorrosion, antifogging, , and oil–water separation. , Therefore, it is possible to develop an efficient antiscaling technology by combining superhydrophobicity and ultrasonication.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown that the superhydrophobic materials have the properties of anti-icing, 14,15 anticorrosion, 16 antifogging, 17,18 and oil−water separation. 19,20 Therefore, it is possible to develop an efficient antiscaling technology by combining superhydrophobicity and ultrasonication.…”

Section: Introductionmentioning

confidence: 99%

Efficient Antiscaling Technology Based on Superhydrophobicity Coupled Ultrasonic Technology

Wang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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To meet the urgent demand for antiscaling technology, a superhydrophobic surface coupled with ultrasonic technology is proposed to develop an environmentally friendly, energysaving, and high-efficiency antiscaling technology. Six types of superhydrophobic coatings are prepared on the metal surface by the spray adhesion method, and their antiscaling performance is carefully investigated. The result shows that the prepared superhydrophobic samples have a certain antiscaling ability, but the antiscaling rate is significantly affected by temperature, pressure, and flow state. Then, the synergism of ultrasonication and superhydrophobicity can not only reduce the adhesion and growth of CaCO 3 but also affect the morphology of CaCO 3 . It can further reduce the amount of scaling on the superhydrophobic surface coated with ECA/PTFE, PDMS/PTFE, ECA/ FEP, and PDMS/FEP. The antiscaling rate of the four superhydrophobic surfaces reaches 100% even under intermittent ultrasonic treatment. The combination of superhydrophobicity and ultrasonic technology shows excellent antiscaling performance and stability, providing a new descaling technology for industrial production.

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Continuous separation of oil/water mixture by a double-layer corrugated channel structure with superhydrophobicity and superoleophilicity

Cited by 21 publications

References 43 publications

Universal Rapid Demulsification by Vacuum Suction Using Superamphiphilic and Underliquid Superamphiphobic Polyurethane/Diatomite Composites

Universal Rapid Demulsification by Vacuum Suction Using Superamphiphilic and Underliquid Superamphiphobic Polyurethane/Diatomite Composites

Scaling Laws for Optimal Power-Law Fluid Flow within Converging-Diverging Dendritic Networks of Tubes and Rectangular Channels

Efficient Antiscaling Technology Based on Superhydrophobicity Coupled Ultrasonic Technology

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