Effect of fiber suspension jet stability on alignment quality of discontinuous carbon fiber tapes

Z. Liu, T.A. Turner, K.H. Wong, S.J. Pickering

Research output: Contribution to journalArticle

1 Citation (Scopus)
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Abstract

A hydrodynamic alignment process has been developed for converting discontinuous random carbon fibers into tapes with a highly aligned orientation distribution to greatly improve the applicability of recovered fibers to composite parts. In hydrodynamic alignment processes short fibers are aligned by the velocity gradient along the flow direction in a convergent nozzle. Thereafter the jet of fiber suspension is deposited on a nylon mesh and the now redundant dispersion medium is drained away to leave an aligned fiber tape. The fundamental physical principles at work in the process have not been widely studied and are shown in the present work to greatly influence the properties of the resulting materials. In this work, the influence of suspension jet stability on the fiber orientation distribution was examined and the liquid jet break-up regime was determined. To explore the factors which can affect the suspension jet stability, different nozzle geometries, viscosities of dispersion media, fiber lengths and Reynolds numbers were applied in experimental work. The shear rate profiles inside different nozzles were simulated by Computational Fluid Dynamics methods and the results described in this paper.

Original languageEnglish
Article number103102
Number of pages12
JournalInternational Journal of Multiphase Flow
Volume120
Early online date29 Aug 2019
DOIs
Publication statusPublished - 30 Nov 2019

Keywords

  • fiber alignment
  • jet break-up regimes
  • shear flow
  • short fiber suspension

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