NDLI: A Model for the Two-Phase Flow Through a Dual-Scale Porous Medium in Liquid Composite Molding

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yamaleev, N. K. Mohan, R. V.
Copyright Year	2007
Abstract	The macroscopic flow during processing of composite structures by liquid composite molding is accompanied by the microscopic flow through individual fiber bundles. This concurrent microscopic flow occurs at length and time scales different than those of the macroscopic flow and influences the macroscopic flow behavior, impacting the void formation during composite manufacturing. A reduced-order model developed by the authors of this paper in [Proc. 2005 ASME Conf., IMECE2005-82436] for modeling the microscopic impregnation of individual fiber bundles is currently used to simulate the transient dynamics of the 1-D two-phase flow though a dual-scale porous medium during resin transfer molding (RTM). As has been show in our previous work [Inter. J. of Multiphase Flow, Vol. 32, pp. 1219–1233, 2006] the vapor-liquid phase transition and multidimensional effects of the gas entrapped inside fiber tows can play a significant role in the advancement of the macroscopic resin front and the formation of voids, thus indicating the need to account for these phenomena in the simulation of liquid composite molding processes. These effects are quantified by introducing a nonzero sink term into the right hand side of the mass conservation equation for the dual-scale porous medium, which couples the microscopic two-phase flow inside fiber bundles with the macro-flow through the perform. Two numerical methods, one of which is based on the moving coordinate system associated with the macroscopic resin front and the other one based on the fill factor technique on a fixed Eulerian coordinate system, are used to solve the resin flow through the preform. The comparative analysis of the fill factor and moving front methods as well as the results demonstrating the effect of phase transition and impregnation of individual fiber bundles on macroscopic flow parameters during RTM are presented.
Starting Page	163
Ending Page	172
Page Count	10
File Format	PDF
ISBN	0791843076
DOI	10.1115/IMECE2007-41226
e-ISBN	0791838129
Volume Number	Volume 13: Processing and Engineering Applications of Novel Materials
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Molding Preforms Multiphase flow Porous materials Vapors Transfer molding Flow (dynamics) Phase transitions Modeling Fibers Transients (dynamics) Composite materials Numerical analysis Simulation Two-phase flow Dynamics (mechanics) Manufacturing Resins
Content Type	Text
Resource Type	Article

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