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Nordic Pulp & Paper Research Journal

The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom


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Volume 34, Issue 2

Issues

Length-based hydrodynamic fractionation of highly networked fibers in a mini-channel

Thomas Schmid
  • Corresponding author
  • Institute of Process and Particle Engineering (IPPT), Graz University of Technology, Inffeldgasse 13/III, 8010 Graz, Austria
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/ Jakob D. Redlinger-Pohn
  • Institute of Process and Particle Engineering (IPPT), Graz University of Technology, Inffeldgasse 13/III, 8010 Graz, Austria
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/ Stefan Radl
  • Institute of Process and Particle Engineering (IPPT), Graz University of Technology, Inffeldgasse 13/III, 8010 Graz, Austria
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Published Online: 2019-03-23 | DOI: https://doi.org/10.1515/npprj-2018-0086

Abstract

Fractionation of cellulose fibers is performed within a circular mini-channel (diameter 7 mm) to realize a novel fractionation principle. We show that fractionation within a single-floc regime relies on the formation of a rigid network in cases where the crowding number is chosen to be greater than 60. Fractionation is performed for channel Reynolds numbers Re> 10,000, and unlike the situation in larger channels, fractionation is found to be relatively independent of Re. Experiments show a high dependency of the radial aperture velocity and aperture width on fractionation performance associated with fibers that are longer than 200 µm. By contrast, fibers shorter than 200 µm are only influenced by the volumetric flow rate through the aperture. Our results suggest that fibers smaller than 200 µm are mobile in the near wall region. Fibers longer than 200 µm are, dependent on their length, drawn out of the network by hydrodynamic forces acting on them as a result of the radial fluid velocity caused by the accept flow through the aperture. Our results support a novel fractionation hypothesis that is in contrast to previous findings, which were based on dilute flows and were demonstrated in channels having a larger size.

Keywords: fiber network; fibers; grade efficiency; hydrodynamic fractionation; mini-channel

References

  • Abbasi Hoseini, A., Lundell, F., Andersson, H.I. (2015) Finite-length effects on dynamical behavior of rod-like particles in wall-bounded turbulent flow. Int. J. Multiph. Flow 76:13–21.Web of ScienceCrossrefGoogle Scholar

  • Bergström, R. Fibre Flow Mechanisms. Royal Institute of Technology, Stockholm, 2005.Google Scholar

  • Cotas, C., Branco, B., Asendrych, D., Garcia, F., Faia, P., Rasteiro, M.G. (2017) Experimental study and computational fluid dynamics modeling of pulp suspensions flow in a pipe. J. Fluids Eng. 139(7):071303.Web of ScienceGoogle Scholar

  • DIN 66142-3:1982-09 (n. d.) Representing and characterizing the separation of disperse materials; Selection and determination of parameters for industrial separation processes.

  • Duffy, G.G. (2003) A new method of fibre fractionation. In: Appita Annu. Conf. Exhib., Melbourne. pp. 453–458.Google Scholar

  • Duffy, G.G., Abdullah, L. (2003) Fibre suspension flow in small diameter pipes. Appita J. 56(4):290–295.Google Scholar

  • Duffy, G.G., Ramachandra, S. (2005) Validation of flow mechanisms of fibre suspensions in small diameter pipes. Appita J. 58(5):374–377.Google Scholar

  • Duffy, G.G., Titchener, A.L., Lee, P.F.W., Moller, K. (1976) The mechanisms of flow of pulp suspensions in pipes. Appita J. 29(5):363–370.Google Scholar

  • Fock, H., Claesson, J., Rasmuson, A., Wikström, T. (2011) Near wall effects in the plug flow of pulp suspensions. Can. J. Chem. Eng. 89(5):1207–1216.CrossrefWeb of ScienceGoogle Scholar

  • Fock, H., Rasmuson, A. (2008) Near wall studies of pulp suspension flow using PIV. Nord. Pulp Pap. Res. J. 23(1):120–125.CrossrefWeb of ScienceGoogle Scholar

  • Forgacs, O.L., Robertson, A.A., Mason, S.G. (1958) The hydrodynamic behaviour of paper-making fibres. Pulp Pap. Mag. Can. 117–128.Google Scholar

  • Gooding, R.W. The Passage of Fibres Through Slots in Pulp Screening. University of British Columbia, 1986.Google Scholar

  • Gooding, R.W., Kerekes, R.J., Salcudean, M. (2001) The flow resistance of slotted apertures in pulp screens. In: 12th Fundam. Res. Symp.Google Scholar

  • Haavisto, S., Cardona, M.J., Salmela, J., Powell, R.L., McCarthy, M.J., Kataja, M., Koponen, A.I. (2017) Experimental investigation of the flow dynamics and rheology of complex fluids in pipe flow by hybrid multi-scale velocimetry. Exp. Fluids 58(11):1–13.Web of ScienceGoogle Scholar

  • Hubbe, M.A. (2007) Flocculation and redispersion of cellulosic fiber suspensions: a review of effects of hydrodynamic shear and polyelectrolytes. BioResources 2(2):296–331.Google Scholar

  • Jäsberg, A. Flow Behaviour of Fibre Suspension in Straight Pipes: New Experimental Techniques and Multiphase Modeling. University of Jyväskylä, 2007.Google Scholar

  • Jäsberg, A., Koponen, A., Kataja, M., Timonen, J. (2000) Hydrodynamical forces acting on particles in a two-dimensional flow near a solid wall. Comput. Phys. Commun. 129(1):196–206.CrossrefGoogle Scholar

  • Karinkanta, P., Laitinen, O. (2017) Use of tube flow fractionation in wood powder characterisation. Biomass Bioenergy 99:122–138.Web of ScienceCrossrefGoogle Scholar

  • Kerekes, R.J., Schell, C.J. (1992) Characterization of fibre flocculation regimes by a crowding factor. J. Pulp Pap. Sci. 18(1):32–38.Google Scholar

  • König, J. Experimental Study of Separation of Fines from Fiber Suspensions with Hydrodynamic Filtration. University of Technology Graz, 2016.Google Scholar

  • Kumar, A. Passage of Fibres Through Screen Apertures. University of British Columbia, 1991.Google Scholar

  • Laitinen, O., Kemppainen, K., Stoor, T., Niinimäki, J. (2011) Fractionation of pulp and paper particles selectively by size. BioResources 6(1):672–685.Google Scholar

  • Madani, A. Fractionation of Particle Suspensions in a Viscoplastic Fluid: Towards a Novel Process. University of British Columbia, 2011.Google Scholar

  • Martinez, D.M., Buckley, K., Lindström, A., Thiruvengadaswamy, R., Olson, J.A., Ruth, T.J., Kerekes, R.J. (2001) Characterizing the mobility of papermaking fibres during sedimentation. In: Sci. Papermak. 12th Fundam. Res. Symp. 16 (September 2001). pp. 225–254.Google Scholar

  • Mason, S.G. (1950) The flocculation of pulp suspensions and the formation of paper. Tappi J. 33(9):440–444.Google Scholar

  • Medhi, B.J., Ashok Kumar, A., Singh, A. (2011) Apparent wall slip velocity measurements in free surface flow of concentrated suspensions. Int. J. Multiph. Flow 37(6):609–619.Web of ScienceCrossrefGoogle Scholar

  • Olson, J.A. The Effect of Fibre Length on Passage Through Narrow Apertures. University of British Columbia, 1996.Google Scholar

  • Olson, J.A. (2001) Fibre length fractionation caused by pulp screening, slotted screen plates. J. Pulp Pap. Sci. 27(8):255–261.Google Scholar

  • Olson, J.A., Wherrett, G. (1998) A model of fibre fractionation by slotted screen apertures. J. Pulp Pap. Sci. 24(12):398–403.Google Scholar

  • Pettersson, A.J., Wikström, T., Rasmuson, A. (2006) Near wall studies of pulp suspension flow using LDA. Can. J. Chem. Eng. 84:422–430 (August).Google Scholar

  • Redlinger-Pohn, J.D., Bauer, W., Radl, S. (2017a) Fractionation of fibre pulp in a hydrodynamic fractionation device: influence of reynolds number and accept flow rate. In: Trans. 16Th Fundam. Res. Symp. (Oxford, September 2017). pp. 209–228.Google Scholar

  • Redlinger-Pohn, J.D., König, J., Radl, S. (2017b) Length-selective separation of cellulose fibres by hydrodynamic fractionation. Chem. Eng. Res. Des. 126:54–66 (Institution of Chemical Engineers).CrossrefWeb of ScienceGoogle Scholar

  • Robertson, A.A., Mason, S.G. (1957) The flow characteristics of dilute fiber suspensions. Tappi J. 40(5):326–334.Google Scholar

  • Sha, J., Nikbakht, A., Wang, C., Zhang, H., Olson, J. (2015) The effect of consistency and freeness on the yield stress of chemical pulp fibre suspensions. BioResources 10(3):4287–4299.Google Scholar

  • Soszynski, R.M., Kerekes, R.J. (1988) Elastic interlocking of nylon fibers suspended in liquid. Part 2. Process of interlocking. Nord. Pulp Pap. Res. J. 3(4):180–184.CrossrefGoogle Scholar

  • Steenberg, B., Wahren, D. (1960) Concentration gradients in boundary layers of streaming fibre suspensions. Sven. Papp.tidn. 63(11):347–355.Google Scholar

  • Tamura, A., Sugaya, S., Yamada, M., Seki, M. (2011) Tilted-branch hydrodynamic filtration for length-dependent sorting of rod-like particles. In: 15th Int. Conf. Miniaturized Syst. Chem. Life Sci. (c). pp. 1343–1345.Google Scholar

  • Vollmer, H., Fredlund, M., Grundström, K.-J. (2001) Characterization of fractionation equipment. In: Ecopapertech Conf. 3. pp. 27–35.Google Scholar

  • Walmsley, M., Atkins, M. (2003) Comparing fibre length fractionation of a laboratory flow channel to an industrial pressure screen. In: Proc. 57th Appita Annu. Gen. Conf. Exhib. pp. 369–376.Google Scholar

  • Weber, A.P., Legenhausen, K. (2014) Characterization of a classification or separation process. Ullmann’s Encycl. Ind. Chem. pp. 1–11.Google Scholar

About the article

Received: 2018-12-17

Accepted: 2019-03-03

Published Online: 2019-03-23

Published in Print: 2019-05-26


The authors gratefully acknowledge the industrial partners Sappi Austria Produktions-GmbH & Co KG, Zellstoff Pöls AG and Mondi Frantschach GmbH, and the Competence Centers for Excellent Technologies (COMET), promoted by BMVIT, BMDW, Styria and Carinthia and managed by FFG, for their financial support of the K-project FLIPPR² (Future Lignin and Pulp Processing Research – PROCESS INTEGRATION).


Conflict of interest: The authors declare no conflicts of interest.


Citation Information: Nordic Pulp & Paper Research Journal, Volume 34, Issue 2, Pages 182–199, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631, DOI: https://doi.org/10.1515/npprj-2018-0086.

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