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

Liu, Zhe; Turner, Thomas; Wong, Kok; Pickering, Stephen

Authors

Zhe Liu

Thomas Turner

Kok Wong

Stephen Pickering



Abstract

A hydrodynamic alignment process has been developed for converting discontinuous random carbon fibres into tapes with a highly aligned orientation distribution to greatly improve the applicability of recovered fibres to composite parts. In hydrodynamic alignment processes short fibres are aligned by the velocity gradient along the flow direction in a convergent nozzle. Thereafter the jet of fibre suspension is deposited on a nylon mesh and the now redundant dispersion medium is drained away to leave an aligned fibre 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 fibre 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, fibre 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.

Journal Article Type Article
Publication Date 2019-11
Journal International Journal of Multiphase Flow
Print ISSN 0301-9322
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 120
Article Number 103102
APA6 Citation Liu, Z., Turner, T., Wong, K., & Pickering, S. (2019). Effect of fibre suspension jet stability on alignment quality of discontinuous carbon fibre tapes. International Journal of Multiphase Flow, 120, https://doi.org/10.1016...tiphaseflow.2019.103102
DOI https://doi.org/10.1016/j.ijmultiphaseflow.2019.103102
Keywords Mechanical Engineering; General Physics and Astronomy; Fluid Flow and Transfer Processes
Publisher URL https://www.sciencedirect.com/science/article/pii/S0301932219301740

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