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  • Autor
    • Redlinger-Pohn, Jakob Dominik
    • König, Josef
    • Radl, Stefan
  • TitelLength-selective separation of cellulose fibres by hydrodynamic fractionation
  • Datei
  • Persistent Identifier
  • Erschienen inChemical Engineering Research and Design / A
  • Band126
  • Erscheinungsjahr2017
  • Seiten54-66
  • LicenceCC-BY
  • ZugriffsrechteCC-BY
  • Download Statistik571
  • Peer ReviewJa
  • AbstractA hydrodynamic fraction device (HDF) was developed based on the principle of sponta- neous fibre network formation and subsequent segregation of fibres and fines in cellulose pulp. Separation is most successful in the so-called “annulus plug flow” regime, which is demonstrated for various combinations of fibre concentration and Reynolds number. In this regime, fibres form a network in the channel center, surrounded by fluid with relative low concentration of fibres and large concentration of fines. As in flow channel separation, wall bounded fluid — containing the fines fraction — is removed from the main flow via side-channels. Long fibres that form a network exit via the main channel. Via an array of experiments we demonstrate precise fractionation of cellulose pulp at a typical cut size of 1 mm. Also, we show that higher Reynolds numbers lead to a dispersion of the fibre network, and consequently a lower sharpness of cut — increasing the fibre concentration leads to a lower yield of shorter fibres. While variation of geometrical parameters did not affect the separation performance, the design of the HDF clearly impacts its capacity