Abstract

• Transverse and longitudinal permeability models are developed for hybrid composites. • Permeability models are able to predict values in a wide range of cell porosity. • The model is valid for symmetrical and hybrid type cells and only depends on geometric parameters but not of fluid rheology. • Above 0.6 porosity value the models behave as symmetric. Transverse and longitudinal permeability for hybrid fibrous porous media were determined by solving Stokes and Darcy–Weisbach equations, respectively. A rectangular representative unit hybrid-cell with two sizes of fibre was used for solving one dimensional fluid flow to obtain velocity profile, flux, pressure drop and finally permeability. Both models were validated by using analytical models for permeability in symmetric cells reported in literature. Numerical simulations were performed using computational fluid dynamics to assess the permeability behaviour of several hybrid cells. Interesting results were found for several fibre radii ratios where the permeability changes differently for transverse and longitudinal models, so this model is based on fibre spacing and the change in diameter. It is notorious that for low porosity values and low fibre radii ratios, the transverse permeability decreases with respect to the constant fibre radii cell. It can be concluded that the permeability only depends on geometric variables, and the hybrid effect is more relevant in the permeability for porosities lower than 0.65.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.