Estimation of liquid entry pressure in hydrophobic membranes using CFD tools

Yazgan‐Birgi, Pelin; Ali, Mohamed I. Hassan; Arafat, Hassan A.

doi:10.1016/j.memsci.2018.01.061

Cited by 45 publications

(16 citation statements)

References 36 publications

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“…The above relationship is equivalent to a Young-Laplace equation. More recent efforts have focused on improving the accuracy of Franken's equation by introducing new variables and equations [46,47].…”

Section: Membrane Characterizationmentioning

confidence: 99%

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Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

et al. 2020

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This work focused on enhancing the flux on hydrophobic polymeric membranes aimed for direct contact membrane distillation desalination (DCMD) process without compromising salt rejection efficiency. Successful coating of commercial porous poly-tetrafluoroethylene membranes with poly(vinyl alcohol) (PVA) was achieved by solution dipping followed by a cross-linking step. The modified membranes were evaluated for their performance in DCMD, in terms of water flux and salt rejection. A series of different PVA concentration dipping solutions were used, and the results indicated that there was an optimum concentration after which the membranes became hydrophilic and unsuitable for use in membrane distillation. Best performing membranes were achieved under the specific experimental conditions, water flux 12.2 L·m-2·h-1 [LMH] with a salt rejection of 99.9%. Compared to the pristine membrane, the flux was enhanced by a factor of 2.7. The results seemed to indicate that introducing hydrophilic characteristics in a certain amount to a hydrophobic membrane could significantly enhance the membrane distillation (MD) performance without compromising salt rejection.

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Section: Membrane Characterizationmentioning

confidence: 99%

“…In recent years, the model has been evolved to address this limitation using more sophisticated computational methods and considering additional parameters. Therefore, the evolved model is able to give a more reliable prediction for less hydrophobic porous materials [47].…”

Section: Bubble Point Pressure and Liquid Entry Pressurementioning

confidence: 99%

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

et al. 2020

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“…Beside membrane pore size, LEP can be controlled by different parameters. According to the Young-Laplace equation [9], LEP is governed by membrane pore geometry, maximum pore size, membrane hydrophobicity which represented by liquid contact angle on the membrane surface and liquid solution surface tension [9,32,44]. It can be seen from Fig.…”

Section: Membrane Pore Size and Liquid Entry Pressurementioning

confidence: 99%

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

et al. 2018

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Membrane pore wetting is the main problem hindering long term stability of permeate flux quality in membrane distillation (MD) applications. A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun membrane was fabricated using a combination of electrospinning and electrospraying. The membrane surface hydrophobicity was enhanced by constructing a beaded structure from spraying a mixture of non-fluorinated alumina (Al2O3) nanoparticles (NPs) mixed with low concentration of PVDF polymer on an electrospun base membrane made from PVDF. The results revealed that a rough surface with a hierarchical structure can be constructed, which could not only enhance the membrane hydrophobicity, but also further enhance the permeate efficiency by improving parameters such as flux and rejection. Additionally, the membrane hydrophobicity could be further tuned by controlling the bead spinning volume. Our study shows that the modified membrane with 7.8µm beads layer thickness has boosted the liquid entry pressure (LEP) by 61% from 15.5 psi and the water contact angle to 154 o. The performance of modified membranes with different spraying volume (1-5 ml) along with the neat electrospun and commercial membranes were examined in an air gap membrane distillation (AGMD) application for 5 hours using a 2.5 wt% of synthetic heavy metal solution as a wastewater model. Then, the optimized superhydrophobic membrane with 2 ml spinning volume (ES15-2) was further tested in comparison with the commercial membrane during long-term operations (30 h) using 3.5 wt% of mixed heavy metals. The flux was 18.67 LMH (L m −2 h −1) for modified membrane (ES15-2) compare with 12.62 LMH for commercial PVDF membrane during 30 h of long-term operation with feed and coolant temperature at 60 o C, 20 o C, respectively. The present superhydrophobic membrane fabricated by a combined electrospinning/electrospray method shows high potential for MD applications.

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“…It is noted that LEP also depends on the membrane geometrical structure. 43 At the same deposition time with PHDFA coatings, despite of higher CA for larger-poresize membranes, LEP was observed to decrease with pore size. The membrane porosity was measured to decrease with deposition time due to the negative correlation between porosity and the amount of polymer deposited into membranes.…”

Section: Characteristics Of Chemically Tuned Membranesmentioning

confidence: 91%

“…Vacuum was applied on the permeate side to incrementally increase the pressure against the membrane. 43 The vacuum was recorded using a vacuum gauge (WIKA). LEP was detected when the rst drop of water appearing at the permeate side.…”

Section: Membrane Characterizationmentioning

confidence: 99%

Large-pore-size membranes tuned by chemically vapor deposited nanocoatings for rapid and controlled desalination

Zhu

Mao

2020

RSC Adv.

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Estimation of liquid entry pressure in hydrophobic membranes using CFD tools

Cited by 45 publications

References 36 publications

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Large-pore-size membranes tuned by chemically vapor deposited nanocoatings for rapid and controlled desalination

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