Longitudinal permeability determination of dual-scale fibrous materials. (January 2015)

• Record Type: Journal Article
• Authors: Shou, Dahua; Ye, Lin; Fan, Jintu
• Is Part Of: Composites. Volume 68(2015)
• Page Start: 42
• Page End: 46
• Publication Date: 2015-01
• Subjects: A. Fibers -- B. Microstructures -- C. Analytical modeling -- E. Resin transfer molding (RTM); Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2014.09.018
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: In this work, the longitudinal permeability of squarely packed dual-scale fiber preforms is studied theoretically. These fiber preforms are composed of aligned porous tows and the tows are tightly packed. The effective permeability is calculated as a parallel-like network of intra-tow permeability and inter-tow permeability, which are quantified by Darcy's law and the inscribed radius between tows, respectively. The jump velocity at the interface between inter-tow fluids and porous tows is considered, as derived by substituting Beavers and Joseph's correlation into Brinkman's equation. We further examine the effects of intra-tow permeability on the effective permeability of the fibrous system with three interface conditions: (1) interface velocity = 0, (2) interface velocity = mean intra-tow velocity, and (3) interface velocity = jump velocity. The jump-velocity-based model is found to be closest to numerical data. The influence of the fiber volume fraction of tows on the effective permeability is also analyzed.