Large Eddy Simulation (LES) of Glass Fibre Dispersion in an Internally Spout-Fluidised Bed for Thermoplastic Composite Processing

Yang, Xiaogang; Huang, Xiaobing; Zong, Yuan and Dai, Grance (2012) Large Eddy Simulation (LES) of Glass Fibre Dispersion in an Internally Spout-Fluidised Bed for Thermoplastic Composite Processing. In: UNSPECIFIED.

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Abstract

Large eddy simulation (LES) has been conducted to investigate glass fibre dispersion in an internally spout-fluidised bed with draft tube and disk-baffle, which was used in the manufacture of long glass fibre reinforced thermoplastic composites. The LES results have demonstrated that the internally spout-fluidised bed with draft tube and disk-baffle can remarkably improve its hydrody-namic behaviour, which can effectively disperse fibre bundles and promote pre-impregnation with resin powder in manufacturing fibre reinforced thermoplastics. The hydrodynamics of the spout-fluidised bed has been investigated and reported in a previous paper (Hosseini et al., 2009). This study attempts to reveal important features of fibre dispersion and correlations between the fibre disper-sion and the characteristics of turbulence in the internally spout-fluidised bed using the LES modelling, focusing on the likely hydro-dynamic impact on fibre dispersion. The simulation has clearly indicated that there exists a strong interaction between the turbulent shear flow and transported fibres in the spout-fluidised bed. Fibre entrainment is strongly correlated with the local vorticity distribu-tion. The dispersion of fibres was modelled by a species transport equation in the LES simulation. The turbulent kinetic energy, Rey-nolds stress and strain rate were obtained by statistical analysis of the LES results. The LES results also clearly show that addition of the internals in the spout-fluidised bed can significantly change the turbulent flow features and local vorticity distribution, enhancing the capacity and efficiency of fibre flocs dispersion.

Item Type: Conference or Workshop Item
Additional Information: Copyright © 2012 Glyndŵr University and the authors, all rights reserved. This article was first presented at the 2nd International Conference on Advanced Composite Materials and Technologies for Aerospace Applications, June 11-13, 2012, Wrexham, UK and published in the conference proceedings by Glyndŵr University. Permission to copy, reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from Glyndŵr University. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. It is published here with the permission of the Authors, and the full proceedings are available to purchase at http://www.lulu.com/shop/richard-day-and-sergey-reznik/advanced-composite-materials-and-technologies-for-aerospace-applications/paperback/product-20214156.html;jsessionid=566556BF08A9459FC8807B9BF9878A8D#productDetails
Keywords: Spout-fluidised bed, Fibre flocs, Dispersion, Turbulent flow, LES
Members: Glyndŵr University
Depositing User: ULCC Admin
Date Deposited: 30 Jun 2012 00:12
Last Modified: 20 Mar 2016 21:24
URI: http://collections.crest.ac.uk/id/eprint/3688

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