Flow analysis and fouling on the patterned membrane surface

Lee, Young Ki; Won, Young-June; Yoo, Jae Hyun; Ahn, Kyung Hyun; Lee, Chung‐Hak

doi:10.1016/j.memsci.2012.10.010

Cited by 125 publications

(90 citation statements)

References 15 publications

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“…A distorted flow field was formed near the surface, and high shear stress was distributed in the apex region in contrast to the low shear stress contour in the valley region. This result is in accordance with the previous study where high wall shear stress was observed in the upper region of the surface patterns [11].…”

Section: Flow Characteristics Near the Patterned Membrane Surfacesupporting

confidence: 94%

“…Because these substances exhibit fundamentally similar behaviors with the model attractive particles studied in our system, we believe that the influence of flow on the particle deposition has a close relationship to biofouling caused by the deposition of suspended bacteria in wastewater. As the local wall shear stress is increased, the microorganisms could easily be detached from the membrane, and the biofouling could be diminished in the patterned membrane of the prism shape [11].…”

Section: Particle Deposition In the Sub-regions Between Surface Patternsmentioning

confidence: 99%

“…Ngene et al used CFD to calculate the velocity profile, streamline, and the wall shear stress in the micro-structured membrane module, and they compared the results with the particle deposition observed in the experiments [10]. Lee et al conducted flow analysis with CFD to consider flow characteristics in a patterned membrane module [11]. They observed that the flow characteristics such as local wall shear stress and vortex development might have influence on the microbial attachment on the patterned membrane surface.…”

Section: Introductionmentioning

confidence: 99%

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Particle deposition on the patterned membrane surface: Simulation and experiments

et al. 2015

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Section: Flow Characteristics Near the Patterned Membrane Surfacesupporting

confidence: 94%

Section: Particle Deposition In the Sub-regions Between Surface Patternsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Particle deposition on the patterned membrane surface: Simulation and experiments

et al. 2015

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“…Scheuerman et al [57] noted that the edges of groves provided favourable areas for bacterial adhesion. This was later confirmed by Lee et al [58] who showed that bacterial adhesion occurred in areas of low shear stress. Topographical heterogeneities on the membrane surface may provide areas of low shear stress therefore promoting adhesion within defect areas as shown in Figure 6, which shows SEM images of Ps.…”

Section: Scanning Electron Microscopymentioning

confidence: 55%

Nanofiltration and reverse osmosis surface topographical heterogeneities: Do they matter for initial bacterial adhesion?

Allen

Semiao

Habimana

et al. 2015

Journal of Membrane Science

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The role of the physicochemical and surface properties of NF/RO membranes influencing bacterial adhesion has been widely studied. However, there exists a poor understanding of the potential role membrane topographical heterogeneities can have on bacterial adhesion. Heterogeneities on material surfaces have been shown to influence bacterial adhesion and biofilm development. The purpose of this study was therefore to investigate whether the presence of membrane topographical heterogeneities had a significant role during bacterial adhesion as this could significantly impact on how biofouling develops on membranes during NF/RO operation. An extensive study was devised in which surface topographical heterogeneities from two commercial membranes, NF270 and BW30, were assessed for their role in the adhesion of two model organisms of different geometrical shapes, Pseudomonas fluorescens and Staphylococcus epidermidis. The influence of cross-flow velocity and permeate flux was also tested, as well as the angle to which bacteria adhered compared to the flow direction. Bacterial adhesion onto the membranes and in their surface topographical heterogeneities was assessed using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), fluorescence microscopy and image analysis. Results showed that up to 30% of total adhered cells were found in membrane defect areas when defect areas only covered up to 13% of the membrane surface area. This suggests that topographical heterogeneities may play a significant role in establishing environmental niches during the early stages of biofilm development. Furthermore, no noticeable difference between the angle of cell attachment in defect areas compared to the rest of the membrane surface was found.

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“…This indicates that surfaces that undergo higher wall shear would be more difficult for microorganisms to adhere to [8]. This indicates that high wall shear stress directly prevent biofouling.…”

Section: Wall Shear Stressmentioning

confidence: 99%

Assessing Bioinspired Topographies for their Antifouling Potential Control Using Computational Fluid Dynamics (CFD)

Ling

Wong

2018

MATEC Web Conf.

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Abstract.Biofouling is the accumulation of unwanted material on surfaces submerged or semi submerged over an extended period. This study investigates the antifouling performance of a new bioinspired topography design. A shark riblets inspired topography was designed with Solidworks and CFD simulations were antifouling performance. The study focuses on the fluid flow velocity, the wall shear stress and the appearance of vortices are to be noted to determine the possible locations biofouling would most probably occur. The inlet mass flow rate is 0.01 kgs -1 and a no-slip boundary condition was applied to the walls of the fluid domain. Simulations indicate that Velocity around the topography averaged at 7.213 x 10 -3 ms -1 . However, vortices were observed between the gaps. High wall shear stress is observed at the peak of each topography. In contrast, wall shear stress is significantly low at the bed of the topography. This suggests the potential location for the accumulation of biofouling. Results show that bioinspired antifouling topography can be improved by reducing the frequency of gaps between features. Linear surfaces on the topography should also be minimized. This increases the avenues of flow for the fluid, thus potentially increasing shear stresses with surrounding fluid leading to better antifouling performance.

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Flow analysis and fouling on the patterned membrane surface

Cited by 125 publications

References 15 publications

Particle deposition on the patterned membrane surface: Simulation and experiments

Particle deposition on the patterned membrane surface: Simulation and experiments

Nanofiltration and reverse osmosis surface topographical heterogeneities: Do they matter for initial bacterial adhesion?

Assessing Bioinspired Topographies for their Antifouling Potential Control Using Computational Fluid Dynamics (CFD)

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