3D MRI velocimetry of non-transparent 3D-printed staggered herringbone mixers

Wiese, Martin; Benders, Stefan; Blümich, Bernhard; Weßling, Matthias

doi:10.1016/j.cej.2018.02.096

Cited by 27 publications

(20 citation statements)

References 31 publications

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“…However, for comparability with the flow-MRI, the displayed infinitesimal 2D CFD slice plots are averaged over the same slice thickness of 1 cm as in the 2D flow-MRI. This procedure is performed as described in our previous work [15,23]. The axial velocity magnitudes are average as |u axial | " a u 2 z and the radial velocity magnitudes as |u radial | " a u 2…”

Section: Membranementioning

confidence: 99%

“…Overlaying flow and no flow images facilitate the capture of fluid velocities. This measuring technique using the 2D spin-echo pulse sequence is adapted from previous studies [15,23,28,29,37].…”

Section: Mri Flow-mri Measurements and Data Processingmentioning

confidence: 99%

“…A novel methodology to evaluate the membranes filtration performance and backwashing capabilities is magnetic resonance imaging (MRI). MRI and flow-MRI are non-invasive tools to monitor fluid velocities and particle depositions online and in-situ [15,[23][24][25][26][27][28][29]].…”

Section: Introductionmentioning

confidence: 99%

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Shell and lumen side flow and pressure communication during permeation and filtration in a multibore polymer membrane module

Wypysek

Rall

Wiese

et al. 2019

Journal of Membrane Science

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This study reveals the importance of the module geometry on the flow field and pressure distribution during membrane permeation for multibore membranes. The pathways of permeation are unraveled within a custom-made single multibore membrane module. For this, we combine flow velocimetry of magnetic resonance imaging (MRI) with computational fluid dynamic (CFD) simulations and permeation experiments. First, a systematic simulation study identifies flow patterns based on simplified geometry features that are supported experimentally through flow-MRI measurements. This comprehensive study shows how small geometric deviations from the idealistic assumptions result in unexpected fluid flow on the shell and lumen side in the module. Second, the influence of those non-ideal flow patterns during the filtration of silica particles are revealed by MRI. The results indicate heterogeneous silica deposition due to geometry induced flow fields. Contrary to the idealized assumption, the subsequent backwashing is also influenced by those deposition patterns. Hence, unavoidable non-idealities of membrane positioning during the construction of the module influence the performance of the membrane filtration. With this study, we stimulate to analyze and pioneer new strategies to fully recover the membrane's performance after filtration cycles during backwashing based on a precisely designed backwash optimized permeate channel geometry in membrane modules.

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Section: Membranementioning

confidence: 99%

Section: Mri Flow-mri Measurements and Data Processingmentioning

confidence: 99%

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Shell and lumen side flow and pressure communication during permeation and filtration in a multibore polymer membrane module

Wypysek

Rall

Wiese

et al. 2019

Journal of Membrane Science

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“…The open face was bonded to a glass slide using polydimethylsiloxane (PDMS) as the adhesion layer. Recently, Wiese et al fabricated an SHM device using an Objet EDEN printer to study fluid dynamics by 3D flow magnetic resonance imaging [22]. The channel, which featured a 2-mm width and 500-µm groove height, was printed with an open face and sealed with an O-ring onto a glass slide.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Mixer with Automated Electrode Switching for Sensing Applications

et al. 2020

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An electronic tongue (e-tongue) is a multisensory system usually applied to complex liquid media that uses computational/statistical tools to group information generated by sensing units into recognition patterns, which allow the identification/distinction of samples. Different types of e-tongues have been previously reported, including microfluidic devices. In this context, the integration of passive mixers inside microchannels is of great interest for the study of suppression/enhancement of sensorial/chemical effects in the pharmaceutical, food, and beverage industries. In this study, we present developments using a stereolithography technique to fabricate microfluidic devices using 3D-printed molds for elastomers exploring the staggered herringbone passive mixer geometry. The fabricated devices (microchannels plus mixer) are then integrated into an e-tongue system composed of four sensing units assembled on a single printed circuit board (PCB). Gold-plated electrodes are designed as an integral part of the PCB electronic circuitry for a highly automated platform by enabling faster analysis and increasing the potential for future use in commercial applications. Following previous work, the e-tongue sensing units are built functionalizing gold electrodes with layer-by-layer (LbL) films. Our results show that the system is capable of (i) covering basic tastes below the human gustative perception and (ii) distinguishing different suppression effects coming from the mixture of both strong and weak electrolytes. This setup allows for triplicate measurements in 12 electrodes, which represents four complete sensing units, by automatically switching all electrodes without any physical interaction with the sensor. The result is a fast and reliable data acquisition system, which comprises a suitable solution for monitoring, sequential measurements, and database formation, being less susceptible to human errors.

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“…A novel methodology to evaluate 2 the membranes filtration performance and backwashing capabilities is magnetic resonance imaging (MRI). MRI and flow-MRI are non-invasive tools to monitor fluid velocities and particle depositions online and in-situ [15,[23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Shell and lumen side flow and pressure communication during permeation and filtration in a multibore polymer membrane module

Weßling¹

2019

Preprint

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This study reveals the importance of the module geometry on the flow field and pressure distribution during membrane permeation for multibore membranes. The pathways of permeation are unraveled within a custom-made multibore single membrane module. For this, we combine flow velocimetry of magnetic resonance imaging (flow-MRI) with computational fluid dynamic (CFD) simulations and permeation experiments. First, a systematic simulation study identifies flow patterns based on simplified geometrical features that are supported experimentally through flow-MRI measurements. This comprehensive study shows how small geometric deviations from the idealistic assumptions result in unexpected fluid flow on the shell and lumen side in the module. Second, the influence of those non-ideal flow patterns during the filtration of silica particles are revealed by MRI. The results indicate heterogeneous silica deposition due to geometry induced flow fields. Contrary to the idealized assumption, the subsequent backwashing is also influenced by those deposition patterns. Hence, unavoidable non-idealities of membrane positioning during the construction of the module influence the performance of the membrane filtration. With this study, we stimulate to analyze and pioneer new strategies to optimize module design and fully recover the membrane's performance after filtration cycles during backwashing. Even more, extensive future studies on multiple multibore membranes can reveal their mutual interaction closing the gap between the single multibore membrane behavior and multibore membrane module properties.

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3D MRI velocimetry of non-transparent 3D-printed staggered herringbone mixers

Cited by 27 publications

References 31 publications

Shell and lumen side flow and pressure communication during permeation and filtration in a multibore polymer membrane module

Shell and lumen side flow and pressure communication during permeation and filtration in a multibore polymer membrane module

Microfluidic Mixer with Automated Electrode Switching for Sensing Applications

Shell and lumen side flow and pressure communication during permeation and filtration in a multibore polymer membrane module

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