Influence of porosity, fiber radius and fiber orientation on anisotropic transport properties of random fiber structures - Archive ouverte HAL Access content directly
Conference Papers Year :

Influence of porosity, fiber radius and fiber orientation on anisotropic transport properties of random fiber structures

Abstract

The ability of fibrous media to mitigate sound waves is controlled by their transport properties that are themselves greatly affected by the geometrical characteristics of their microstructure such as porosity, fiber radius, and fiber orientation. Here, the influence of these geometrical characteristics on the anisotropic transport properties of random fiber structures is investigated. First, representative elementary volumes (REVs) of random fiber structures are generated for different triplets of porosity, fiber radius and fiber orientation. The fibers are allowed to overlap and are motionless (rigid-frame assumption). The fiber orientation is derived from a second order orientation tensor. Second, the transport equations are numerically solved on the REVs which are seen as periodic unit cells (PUCs). These solutions yield the transport properties governing the sound propagation and dissipation in the respective fibrous media. These transport properties are the tortuosity, the viscous and thermal static permeabilities, and the viscous characteristic length. Finally, relations are proposed to estimate the transport properties and the thermal characteristic length when the geometry of the fiber structures is known.
submission.pdf (78.08 Ko) Télécharger le fichier
Talk Perrot Acoustic's 2017 Boston.pdf (987.31 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Origin : Files produced by the author(s)

Dates and versions

hal-01664278 , version 1 (14-12-2017)

Identifiers

  • HAL Id : hal-01664278 , version 1

Cite

Hoang Tuan Luu, Camille Perrot, Raymond Panneton. Influence of porosity, fiber radius and fiber orientation on anisotropic transport properties of random fiber structures. 173rd Meeting of the Acoustical Society of America and the 8th Forum Acusticum (Acoustics '17 Boston), Jul 2017, Boston, United States. ⟨hal-01664278⟩
70 View
124 Download

Share

Gmail Facebook Twitter LinkedIn More