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Bubble formation and motion in non-crimp fabrics with perturbed bundle geometry
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Latvian University.
Latvian University.
2008 (English)In: FPCM-9. The 9th International Conference on Flow Processes in Composite Materials: Montréal (Québec), Canada 8 - 10 July 2008, 2008Conference paper, Published paper (Refereed)
Abstract [en]

The behaviour of the fluid front during impregnation of non-crimp fabrics has been considered. Particular attention is paid to creation of bubbles at the fluid front and a virtual 3D model mimicking biaxial fabrics has been build for this purpose. The saturated fluid flow is governed by Navier-Stokes Equations and Darcy law while capillary pressure has been accounted for at the fluid flow front. Continuity is furthermore preserved. The influence of perturbation in the bundle geometry has been investigated where it turns out that local correlations of dimensions of neighbouring gaps formed between the bundles are of highest importance. Focus is set on inter-bundle bubbles, where a previously built model for bubble dynamics is used based on a probabilistic approach for bubbles moving, slitting, merging, dying, and shaping. The obtained void fractions of inter-bundle bubbles at different levels of vacuum applied at the liquid flow front is compared to those from real mouldings with rather good conformity.

Place, publisher, year, edition, pages
2008.
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-39849Local ID: ebee6560-7f0b-11dd-b31d-000ea68e967bOAI: oai:DiVA.org:ltu-39849DiVA: diva2:1013368
Conference
International Conference on Flow Processes in Composite Materials : 08/07/2008 - 10/07/2008
Note
Godkänd; 2008; Bibliografisk uppgift: CD-ROM; 20080910 (stlu)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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