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Kagramanov, G. G.; Dytnerskii, Yu. I.; Il'in, P. G.

doi:10.1023/a:1011332113153

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…Multibore membranes have been subject to many studies regarding optimized geometry [2,4,7,9,10], membrane material [11][12][13], and experimental flow distribution [14][15][16][17][18], as well as flow distribution via computational fluid dynamics (CFD) [16,19,20]. Especially the flow distribution across a multibore membrane has been proven to be very sensitive to non-idealities such as bending, skin damages, or excentric positioning.…”

Section: Introductionmentioning

confidence: 99%

In-situ investigation of wetting patterns in polymeric multibore membranes via magnetic resonance imaging

Wypysek,

Kalde,

Pradellok

et al. 2022

Preprint

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Wetting of the membrane to displace air or conditioning liquids is important to exploit the complex porosity of a filtration membrane. This study reveals the details of wetting in multibore membrane-based filtration modules. Using magnetic resonance imaging (MRI), we quantify the fluid distribution patterns during initial membrane wetting in dead-end permeation mode. The spatio-temporal evolution of aqueous copper sulfate solution wetting the membrane fibers was investigated as a function of the applied flux, packing density, and position along the membrane module length.Three initial wetting conditions were examined: delivery-state membranes, ethanol-washed and dried (air-filled) membranes, and ethanol-filled membranes. Significant changes in wetting patterns were observed due to interfacial and polymer swelling effects. This in-situ investigation reveals a slow wetting progression over six hours and more to obtain complete wetting, even at high fluxes of 200 LMH. However, an increased flux leads to faster wetting kinetics as the evolving wetting patterns are flux dependent. The packing density of the multibore fibers additionally impacts the wetting kinetics by shifting the prevalent pressure conditions. Although in dead-end mode, the wetting progression is non-uniform along the membrane module length.In addition to this parameter study, different pre-wetting agents' effect on the displacement behavior was investigated in depth. This study helps to understand (a) complex wetting phenomena inside multibore membranes in dead-end filtration, (b) the membranes' interaction with their surroundings due to neighboring membranes, and (c) the effect of the used fluid system for displacement on the resulting wetting patterns.

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Section: Introductionmentioning

confidence: 99%

In-situ investigation of wetting patterns in polymeric multibore membranes via magnetic resonance imaging

Wypysek,

Kalde,

Pradellok

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The research approach presented below addresses a methodology to relieve the previous simplifying assumption of homogeneous porosity and quantify the effect of various porosity distribution features. Kagramanov et al [28] analyzed the influence of separation layer and support layer thickness on fluid flow in multibore ceramic membranes with homogeneous pore size distributions in each layer via CFD simulations only. The authors found decreasing filtration efficiency from the center to the periphery depending on the layer thicknesses.…”

Section: Introductionmentioning

confidence: 99%

How does porosity heterogeneity affect the transport properties of multibore filtration membranes?

Wypysek,

Rall,

Neef

et al. 2022

Preprint

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The prediction of pressure and flow distributions inside porous membranes is important if the geometry deviates from singlebore tubular geometries. This task remains challenging, especially when considering local porosity variations caused by lumenand shell-side membrane skins and macro-and micro-void structures, all of them present in multibore membranes.This study analyzes pure water forward and reverse permeation and backwashing phenomena for a polymeric multibore membrane with spatially-varying porosity and permeability properties using computational fluid dynamics simulations. The heterogeneity of porosity distribution is experimentally characterized by scanning electron microscopy scans and reconstructed cuboids of X-ray micro-computed tomography scans. The reconstructed cuboids are used to determine porosity, pore size distribution, and intrinsic permeability in the membrane's porous structure in all spatial directions. These position-dependent properties are then applied to porous media flow simulations of the whole membrane domain with different properties for separation layer, support structure, and outside skin layer. Various cases mimicking the pure water permeation, fouling, and backwashing behavior of the membrane are simulated and compared to previously obtained MRI measurements.This work reveals (a) anisotropic permeability values and isoporosity in all directions and (b) differing contributions of each lumen channel to the total membrane performance, depending on the membrane-skin's properties. This study encourages to pertain the quest of understanding the interaction of spatially distributed membrane properties and the overall membrane module performance of multibore membranes.

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“…Those improved tensile properties allow multibore membranes for industrial-scale applications in drinking water production and seawater desalination [1,4,5], as well as wastewater and surface water filtration [2,[6][7][8]. Multibore membranes have been subject to many studies regarding optimized geometry [2,4,7,9,10], membrane material [11][12][13], and experimental flow distribution [14][15][16][17][18], as well as flow distribution via computational fluid dynamics (CFD) [16,19,20]. Especially the flow distribution across a multibore membrane has been proven to be very sensitive to nonidealities such as bending, skin damages, or excentric positioning.…”

Section: Introductionmentioning

confidence: 99%

In-situ investigation of wetting patterns in polymeric multibore membranes via magnetic resonance imaging

Wypysek

Kalde

Pradellok

et al. 2021

Journal of Membrane Science

View full text Add to dashboard Cite

Wetting of the membrane to displace air or conditioning liquids is important to exploit the complex porosity of a filtration membrane. This study reveals the details of wetting in multibore membrane based filtration modules. Using magnetic resonance imaging (MRI), we quantify the fluid distribution patterns during initial membrane wetting in dead-end permeation mode. The spatio-temporal evolution of aqueous copper sulfate solution wetting the membrane fibers was investigated as a function of the applied flux, packing density, and position along the membrane module length. Three initial wetting conditions were examined: delivery-state membranes, ethanol-washed and dried (air-filled) membranes, and ethanol-filled membranes. Significant changes in wetting patterns were observed due to interfacial and polymer swelling effects. This in-situ investigation reveals a slow wetting progression over six hours and more to obtain complete wetting, even at high fluxes of 200 LMH. However, an increased flux leads to faster wetting kinetics as the evolving wetting patterns are flux dependent. Packing density of the multibore fibers additionally impacts the wetting kinetics by shifting the prevalent pressure conditions. Although in dead-end mode, the wetting progression is non-uniform along the membrane module length. In addition to this parameter study, different pre-wetting agents' effect on the displacement behavior was investigated in depth. This study helps to understand (a) complex wetting phenomena inside multibore membranes in dead-end filtration, (b) the membranes' interaction with their surroundings due to neighboring membranes, and (c) the effect of the used fluid system for displacement on the resulting wetting patterns.

show abstract

Untitled

Cited by 5 publications

References 1 publication

In-situ investigation of wetting patterns in polymeric multibore membranes via magnetic resonance imaging

In-situ investigation of wetting patterns in polymeric multibore membranes via magnetic resonance imaging

How does porosity heterogeneity affect the transport properties of multibore filtration membranes?

In-situ investigation of wetting patterns in polymeric multibore membranes via magnetic resonance imaging

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