Erratum to “Measurement of Principal Permeability With the Channel Flow Experiment”

Abstract

Weitzenböck et al. have proposed a theoretical framework for permeability estimation in two-and three-dimensions using a set of channel (1-D) flow experiments. [1] For determining the 2-D permeability tensor, three channel flow experiments must be conducted, whereas for estimating the 3-D permeability tensor, six unidirectional channel flow experiments along six unique orientations need to be performed.The authors have noted important errors in the above-mentioned widely-cited research article. [1] Here we highlight the errors involved in the theoretical derivation of the 3-D permeability tensor and report the corrected forms of the expressions for the tensor components.In Section 4.2 of Weitzenböck et al., [1] based on the Direction of Permeability Measurement, there are two errors. These errors are related to the incorrect rotation angles of the measurement direction as follows: first, the rotation of the measurement direction by 90 ∘ about the y-axis for finding out the effective permeability K V , and second, the rotation of the measurement direction by 45 ∘ about the y-axis for finding out the effective permeability K VI .The recommended corrections for these errors are as follows. First, the effective permeability, K V , should be computed by rotating the measurement direction about the y-axis by À90 ∘ such that it becomes parallel to the z-axis in the laboratory frame of reference, as shown in Figure 1. This leads to the following expression for the effective permeability K V :

Resin infusion in porous preform in the presence of HPM considering complex geometry and gravity: Flow simulation and experimental validation

“…However, the concept of anisotropic permeability in the present model can be incorporated based on the direction co-sine of principal and off-diagonal components analysis of the 3D permeability tensor [ K ]. 37–40…”

“…However, the concept of anisotropic permeability in the present model can be incorporated based on the direction co-sine of principal and off-diagonal components analysis of the 3D permeability tensor [K]. [37][38][39][40] Fabrics used in the FRP composite industry, either woven, non-crimp, or braided, exhibit dual-scale porosity composed of smaller pores (in O(μm)) between the fibers in intra-yarn spaces and larger pores (in O(mm)) between the fibers in inter-yarn spaces. 41,42 During infusion, as the flow front progresses due to the length scale order differences in the dual-scale pore spaces, the viscous forces tend to dominate the flow front between the inter-yarn spaces and the wetting flow in the intra-yarn spaces driven by capillary forces.…”