Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow

Antti Koponen; Sanna Haavisto; Juha Salmela; Markku Kataja

Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow

Antti Koponen, Sanna Haavisto, Juha Salmela, Markku Kataja

Research output: Contribution to journal › Article in a proceedings journal › Scientific

Abstract

Rheological properties and boundary layer flow behaviour of Micro Fibrillated Cellulose (MFC) suspended in water was studied using Ultrasound Velocity Profiling (UVP) and Optical Coherence Tomography (OCT). The high-resolution OCT provided velocity profiles near the transparent tube wall, while UVP yielded corresponding information in the interior parts of the flow. The results from interior part of the flow showed typical power law shear thinning behaviour of MFC suspension. Close to the wall the suspension was found to have strong (apparent) slip flow associated with depletion of MFC particles from the wall. In this thin depletion layer the consistency and the viscosity of the suspension decrease rapidly with decreasing distance from the wall. In the immediate vicinity of the wall the viscosity of the suspension was found to be close to that of pure water.

Original language	English
Pages (from-to)	13-20
Number of pages	8
Journal	Annual transactions of the Nordic Rheology Society
Volume	27
Publication status	Published - Aug 2019
MoE publication type	B3 Non-refereed article in conference proceedings
Event	Nordic Rheology Conference 2019 - Göteborg, Sweden Duration: 21 Aug 2019 → 23 Aug 2019

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FLIPT: Flow Induced Phase Transitions, a new low energy paradigm for polymer processing - EU/FET OPEN-RIA
Holland, C. (Participant), Vollrath, F. (Manager), Vosegaard, T. (Manager), Koponen, A. (Manager), Pereira , C. (Manager) & Sommer, J.-U. (Manager)
1/09/16 → 31/12/19
Project: EU project

Cite this

@article{c3ff83f288eb416788e3941a08f63879,

title = "Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow",

abstract = "Rheological properties and boundary layer flow behaviour of Micro Fibrillated Cellulose (MFC) suspended in water was studied using Ultrasound Velocity Profiling (UVP) and Optical Coherence Tomography (OCT). The high-resolution OCT provided velocity profiles near the transparent tube wall, while UVP yielded corresponding information in the interior parts of the flow. The results from interior part of the flow showed typical power law shear thinning behaviour of MFC suspension. Close to the wall the suspension was found to have strong (apparent) slip flow associated with depletion of MFC particles from the wall. In this thin depletion layer the consistency and the viscosity of the suspension decrease rapidly with decreasing distance from the wall. In the immediate vicinity of the wall the viscosity of the suspension was found to be close to that of pure water.",

author = "Antti Koponen and Sanna Haavisto and Juha Salmela and Markku Kataja",

year = "2019",

month = aug,

language = "English",

volume = "27",

pages = "13--20",

journal = "Annual transactions of the Nordic Rheology Society",

issn = "1601-4057",

publisher = "Nordic Rheology Society NRS",

note = "Nordic Rheology Conference 2019, NRC 2019 ; Conference date: 21-08-2019 Through 23-08-2019",

}

TY - JOUR

T1 - Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow

AU - Koponen, Antti

AU - Haavisto, Sanna

AU - Salmela, Juha

AU - Kataja, Markku

PY - 2019/8

Y1 - 2019/8

N2 - Rheological properties and boundary layer flow behaviour of Micro Fibrillated Cellulose (MFC) suspended in water was studied using Ultrasound Velocity Profiling (UVP) and Optical Coherence Tomography (OCT). The high-resolution OCT provided velocity profiles near the transparent tube wall, while UVP yielded corresponding information in the interior parts of the flow. The results from interior part of the flow showed typical power law shear thinning behaviour of MFC suspension. Close to the wall the suspension was found to have strong (apparent) slip flow associated with depletion of MFC particles from the wall. In this thin depletion layer the consistency and the viscosity of the suspension decrease rapidly with decreasing distance from the wall. In the immediate vicinity of the wall the viscosity of the suspension was found to be close to that of pure water.

AB - Rheological properties and boundary layer flow behaviour of Micro Fibrillated Cellulose (MFC) suspended in water was studied using Ultrasound Velocity Profiling (UVP) and Optical Coherence Tomography (OCT). The high-resolution OCT provided velocity profiles near the transparent tube wall, while UVP yielded corresponding information in the interior parts of the flow. The results from interior part of the flow showed typical power law shear thinning behaviour of MFC suspension. Close to the wall the suspension was found to have strong (apparent) slip flow associated with depletion of MFC particles from the wall. In this thin depletion layer the consistency and the viscosity of the suspension decrease rapidly with decreasing distance from the wall. In the immediate vicinity of the wall the viscosity of the suspension was found to be close to that of pure water.

M3 - Article in a proceedings journal

SN - 1601-4057

VL - 27

SP - 13

EP - 20

JO - Annual transactions of the Nordic Rheology Society

JF - Annual transactions of the Nordic Rheology Society

T2 - Nordic Rheology Conference 2019

Y2 - 21 August 2019 through 23 August 2019

ER -

Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow

Abstract

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Projects

FLIPT: Flow Induced Phase Transitions, a new low energy paradigm for polymer processing - EU/FET OPEN-RIA

Cite this