Lattice Gas Analysis of Liquid Front in Non-Crimp Fabrics
- 107 Downloads
The liquid flow front during impregnation of non-crimp fabrics is considered. Irregularities in fibre bundle architecture lead to generation of bubbles at this front. The velocity of this interface is highly influenced by capillary forces mainly caused by the small fibres inside the bundles. In order to better understand which shapes the liquid front takes up at different conditions, a lattice gas model has been applied. First, the macroscopic properties of the solved gas in the liquid are discussed. Next, bubble inclusions are analyzed as to liquid–gas interface position and concentrations of minor component in each phase. The capillary effects at the fluid front are studied for systems both with and without gaps between the bundles. The flow in the interior of the fibre bundles is scrutinized, as well, by also considering the viscous stresses. The flow through unidirectional fabrics is considered by a one-dimensional model, which suggests that the liquid front inside bundles and gaps moves with the same speed when the liquid front inside the bundle has to catch up with the liquid front in the gap.
KeywordsNon-crimp fabrics Impregnation Lattice gas method Wetting
Unable to display preview. Download preview PDF.
- Advani S.G., Dimitrova Z.: Role of capillary driven flow in composite manufacturing. In: Hartland, S. (eds) Surface and Interfacial Tension: Measurement Theory and Applications, pp. 263–311. Marcel Dekker Inc., New York (2004)Google Scholar
- Lundström T.S., Gebart B.R.: Effect of perturbation of fibre architecture on permeability inside fibre tows. J. Compos. Mater. 29, 424–443 (1995)Google Scholar
- Lundström, T.S., Frishfelds, V., Jakovics, A.: Bubble formation and motion in non-crimp fabrics with perturbed bundle geometry. Compos. A (in print) (2009)Google Scholar
- Madzhulis I., Kaupuzs J., Frishfelds V.: Kinetics of new phase formation inside the crystal. Latv. J. Phys. Tech. Sci. N3, 55–59 (1996)Google Scholar
- Song B., Bismarck A., Springer J.: Contact angle measurements on fibers and fiber assemblies, bundles, fabrics, and textiles. In: Hartland, S. (eds) Surface and Interfacial Tension: Measurement, Theory and Applications, pp. 425–481. Marcel Dekker Inc, New York (2004)Google Scholar
- Ziman J.M.: Models of Disorder: The Theoretical Physics of Homogeneously Disordered Systems. Cambridge University Press, Cambridge (1979)Google Scholar