The effect of Dean Flow in a tube flow fractionation device

Jagiello, Lukas Andreas; Redlinger-Pohn, Jakob Dominik; Fischer, Wilhelm Anton; Eckhart, René; Bauer, Wolfgang

doi:10.3183/npprj-2016-31-04-p641-647

Cited by 4 publications

(4 citation statements)

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“…The average fiber width in each fraction was determined from photographs using the Valmet IMG software (Ver. IMG75467, Valmet, Espoo, Finland) (Laitinen 2011;Laitinen et al 2011;Fukuoka et al 2015aFukuoka et al , 2015bJagiello et al 2016;Karinkanta and Laitinen 2017). The fractionation experiments were performed four times for each sample.…”

Section: Tff Classificationmentioning

confidence: 99%

“…The CaCO3 content of the solid component in each fraction was determined according to the standard incineration method JIS P 8251 (2003). (Fukuoka et al 2015a(Fukuoka et al , 2015bLaitinen 2011;Laitinen et al 2011;Jagiello et al 2016) HBKP fibers and fiber aggregates. Individual HBKP fibers of approximately 1 mm in length were present in Fr.…”

Section: Analysesmentioning

confidence: 99%

“…The tube flow fractionation (TFF) system was developed by Valmet Co. (Finland) for the efficient classification of long and short pulp fibers and fines according to their hydrodynamic sizes (Laitinen 2011). The principle of TFF classification has been reported in detail elsewhere (Laitinen 2011;Laitinen et al 2011;Jagiello et al 2016;Karinkanta and Laitinen 2017). Based on the TFF principle, an approximately 50 mL slurry that contained long and short fibers and fines was quickly separated into five fractions according to the hydrodynamic size of the components.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the TFF principle, an approximately 50 mL slurry that contained long and short fibers and fines was quickly separated into five fractions according to the hydrodynamic size of the components. The TFF system has been applied to various pulp fibers, recycled pulp fibers with residual inks, and wood powders to separate the components according to their hydrodynamic sizes (Laitinen 2011;Laitinen et al 2011;Fukuoka et al 2015aFukuoka et al , 2015bJagiello et al 2016;Karinkanta and Laitinen 2017). Fukuoka et al (2015b) studied the distributions of residual ink particles in recycled pulp fibers and hydrophobic colloidal substances by TFF.…”

Section: Introductionmentioning

confidence: 99%

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Structural analysis of CaCO3 nanoparticle/pulp fiber composites by tube flow fractionation

Fuchise-Fukuoka

Goto

Isogai

2020

BioRes

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Two slurries that consisted of precipitated calcium carbonate (CaCO3) nanoparticles and unbeaten hardwood bleached kraft pulp (HBKP) were prepared via ultrafine bubble and mixing methods. In the ultrafine bubble method, a CO2 gas flow was bubbled into a HBKP slurry that contained Ca(OH)2 to prepare a precipitated CaCO3/HBKP composite slurry. The HBKP/water and precipitated CaCO3/water slurries were prepared separately and mixed to prepare a precipitated CaCO3/HBKP mixture slurry. Each of the two CaCO3/HBKP slurries was separated into five fractions using a tube flow fractionation (TFF) system. The first and second fractions consisted of long HBKP fibers and fiber aggregates. The third fraction had the highest mass ratio of the components in the five fractions, and it had approximately 1-mm-long HBKP fibers. The fourth fraction contained primarily HBKP short fibers and CaCO3 aggregates. Thus, the CaCO3/HBKP components in the slurry were separated adequately by TFF, depending on their hydrodynamic sizes. The average width of each fraction in the CaCO3/HBKP composite slurry was always larger than that of the corresponding fraction from the CaCO3/HBKP mixture slurry, which indicated that precipitated CaCO3 nanoparticles and their aggregates attached stably to long and short pulp fiber surfaces in the composite slurry.

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Section: Tff Classificationmentioning

confidence: 99%

Section: Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural analysis of CaCO3 nanoparticle/pulp fiber composites by tube flow fractionation

Fuchise-Fukuoka

Goto

Isogai

2020

BioRes

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Angular segregation of fibres in pipe flow: floc formation and utilization for length-based fibre separation

Redlinger-Pohn

2020

Cellulose

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Cellulose fibres are prone to flocculate and form aggregates that are deformable by the hydrodynamic stress. In this work I document for coiled pipe flow, known to have secondary motion in the pipe cross-sectional plane, an accumulation of fibre flocs and fibre aggregates at the outer bend. That is the segregation into a section in the pipe cross-section and hence presents a case of angular segregation. The segregation was studied for non-coherent crowded fibre flocs. For that, segregation benefited from fibre concentration and suffered from increased hydrodynamic stress expressed by increasing Reynolds number. Based on the observed segregation of fibres a flow splitter was designed that separated the flow at 1/3 of the tube diameter measured from the inner bend. The outer bend suspension length-weighted fibre length was found to increase. For the best case in this work, the difference between outer and inner bend relative to the feed fibre length was 22%. As for radial and axial segregation, which are known, also angular segregation is fibre-length sensitive. As such it can be exploited for length fractionation of networking and aggregating elongated particles, for example fibres.

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Analysis and Simulation of Blood Cells Separation in a Polymeric Serpentine Microchannel under Dielectrophoresis Effect

et al. 2023

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The current work presents a novel microfluidic approach, allowing a full separation of blood cells. The approach relies on using a polydimethylsiloxane serpentine microchannel equipped with a series of electrodes, providing two separation zones. The proposed design exploits the unique configuration of the channel along with the inherent difference in dielectric properties of the three kinds of blood cells to achieve a size-based sorting. The platelets (PLTs) are subjected to a larger dielectrophoretic force than red blood cells (RBCs) and white blood cells (WBCs), forcing them to be separated in the first zone. This leaves RBCs and WBCs to be separated in the second zone. The model developed in this work has been used intensively to examine the feasibility of the proposed approach. The model results showed a full separation of blood content can be achieved over a range of phase flow rates and AC frequencies.

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The effect of Dean Flow in a tube flow fractionation device

Cited by 4 publications

References 0 publications

Structural analysis of CaCO3 nanoparticle/pulp fiber composites by tube flow fractionation

Structural analysis of CaCO3 nanoparticle/pulp fiber composites by tube flow fractionation

Angular segregation of fibres in pipe flow: floc formation and utilization for length-based fibre separation

Analysis and Simulation of Blood Cells Separation in a Polymeric Serpentine Microchannel under Dielectrophoresis Effect

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