Sinusoidal shaped hollow fibers for enhanced mass transfer

Luelf, Tobias; Tepper, Maik; Breisig, Hans; Weßling, Matthias

doi:10.1016/j.memsci.2017.03.030

Cited by 31 publications

(12 citation statements)

References 32 publications

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“…However, for applications in membrane oxygenators, microstructuring of the lumen is less important, as the main transport resistance occurs on the blood and, therefore, shell side of the fiber [1]. Experimental work that altered the shell side of the fiber in the longitudinal direction, using a pulsating bore fluid concept, showed potential improvements in the mass transfer capabilities in comparison to a straight fiber geometry [7,8]. In a different approach, microstructuring was achieved by rotating a 3D printed spinneret, resulting in helically twisted fiber geometries [9].…”

Section: Introductionmentioning

confidence: 99%

“…As the production of arbitrary shaped hollow fiber membranes is complex, and experimental visualization of the flow patterns inside a hollow fiber membrane packing is difficult [14], computational fluid dynamics simulations are a potentially powerful tool to gain insight to this question. In this work, we follow the approach of Santos et al [15] to calculate the local Sherwood number on a membrane sur- Experimental work that altered the shell side of the fiber in the longitudinal direction, using a pulsating bore fluid concept, showed potential improvements in the mass transfer capabilities in comparison to a straight fiber geometry [7,8]. In a different approach, microstructuring was achieved by rotating a 3D printed spinneret, resulting in helically twisted fiber geometries [9].…”

Section: Introductionmentioning

confidence: 99%

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Microstructured Hollow Fiber Membranes: Potential Fiber Shapes for Extracorporeal Membrane Oxygenators

et al. 2021

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Extracorporeal membrane oxygenators are essential medical devices for the treatment of patients with respiratory failure. A promising approach to improve oxygenator performance is the use of microstructured hollow fiber membranes that increase the available gas exchange surface area. However, by altering the traditional circular fiber shape, the risk of low flow, stagnating zones that obstruct mass transfer and encourage thrombus formation, may increase. Finding an optimal fiber shape is therefore a significant task. In this study, experimentally validated computational fluid dynamics simulations were used to investigate transverse flow within fiber packings of circular and microstructured fiber geometries. A numerical model was applied to calculate the local Sherwood number on the membrane surface, allowing for qualitative comparison of gas exchange capacities in low-velocity areas caused by the microstructured geometries. These adverse flow structures lead to a tradeoff between increased surface area and mass transfer. Based on our simulations, we suggest an optimal fiber shape for further investigations that increases potential mass transfer by up to 48% in comparison to the traditional, circular hollow fiber shape.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructured Hollow Fiber Membranes: Potential Fiber Shapes for Extracorporeal Membrane Oxygenators

et al. 2021

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“…In dieser Arbeit sollen zwei selbstentwickelte Konzepte kombiniert werden, um sinusförmige Komposit‐Hohlfasermembranen in einem einzigen Schritt herzustellen. Während des direkten Spinnenverfahrens von Komposit‐Hohlfasermembranen wird ein Pulsationsmodul in den Herstellungsprozess integriert und bewirkt eine Änderung der Lumenkanalgeometrie .…”

Section: Introductionunclassified

“…Mit einem maßgeschneiderten Pulsationsgerät, das leicht in den traditionellen Spinn‐Aufbau integriert werden kann, wird die Flussrate der Lumenflüssigkeit variiert. Luelf et al haben sinusförmige Hohlfasermembranen aus Polyvinylidenfluorid (PVDF) hergestellt. Unterschiedliche Pulsationsparameter erzeugen einzigartige sinusförmige Durchmesseränderungen.…”

Section: Introductionunclassified

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

Roth

Alders

Luelf

et al. 2019

Chemie Ingenieur Technik

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Mit dem direkten Spinnverfahren können Komposit‐Hohlfasermembranen in einem einstufigen Prozess hergestellt werden. Dabei wird die klassische Faserbildung mit einer Grenzflächenpolymerisation auf der Lumenseite der Hohlfaser überlagert. Für die Herstellung von sinusförmigen Hohlfasermembranen wird im herkömmlichen Nassspinnprozess zusätzlich die Lumenflüssigkeit während des Spinnens pulsiert. In dieser Arbeit wurden Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie hergestellt. Die sinusförmige Geometrie kann Konzentrationspolarisationseffekte in Membrananwendungen reduzieren.

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“…Therefore, it can be inferred that mass transfer has a different behavior in each fiber depending on the spatial location inside the module. Recent studies have modified the geometry of hollow fiber in order to increase the advection, and in this way, also improve mass transfer (Luelf et al., 2017; Motevalian et al., 2016). These studies have shown the need to consider the local velocity field on the fiber to improve mass transfer calculation.…”

Section: Introductionmentioning

confidence: 99%

Simulation of mass transfer in hollow fiber used for concentration of juices by osmotic distillation

Zambra

2019

Heliyon

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A bi-dimensional diffusion mathematical model is proposed to study mass transfer in hollow fiber used for the concentration of juices by osmotic distillation (OD). The mathematical model was solved using the Finite Volume Method (FVM). The mass fraction at the boundaries was calculated by using the Functional-group Activity Coefficients (UNIFAC) method for the juice and by the Analytical Solutions Of Groups (ASOG) method for the brine. Calculated results were compared to an analytical solution for a case of mass diffusion in a cylinder with mass flow boundary condition. An algorithm to find the effective diffusion coefficient of gas through the membrane is proposed. To show its usefulness, different velocities were applied over the fiber surface to study the bi-dimensional effects that this velocity field has on the mass transfer inside the fiber. The results showed a maximum error of 5.6% when compared to experimental results.

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Sinusoidal shaped hollow fibers for enhanced mass transfer

Cited by 31 publications

References 32 publications

Microstructured Hollow Fiber Membranes: Potential Fiber Shapes for Extracorporeal Membrane Oxygenators

Microstructured Hollow Fiber Membranes: Potential Fiber Shapes for Extracorporeal Membrane Oxygenators

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

Simulation of mass transfer in hollow fiber used for concentration of juices by osmotic distillation

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