Prediction and interpretation of hydraulic permeability for nonwoven fabrics considering hypothetical 2-D layer

Seung Jae Ahn, Moo Sung Lee, Dae Young Lim, Jung Nam Im, Seung Goo Lee, Ji Ho Youk, Han Yong Jeon

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The permeability defined by Darcy's law indicates the degree of ability that a fluid can flow through nonwoven media under a differential pressure in laminar flow. The permeability generally indicates the specific permeability or absolute permeability. On the other hand, if the fluid is water, the permeability indicates the hydraulic conductivity or permeability coefficient. The permeability is one of the important properties for nonwoven media and a prediction of the permeability acts as a bridge between the manufacturing technology and performance requirements. Because capillary channel theory aims to make the flow of fluid easier and more understandable, many models are based on capillary channel theory. On the other hand, the theory has a limitation in that it is unsuitable for high porosity media. In this study, a very thin downstream layer, which was suggested by Lifshutz [9], was introduced to derive a prediction model of hydraulic permeability. Needle-punched and spunbonded nonwoven fabrics with various basis weights were used in the cross-plain water permeability test. From this 'thin layer' model, reasonable agreement between the predicted and experimental results was obtained.

Original languageEnglish
Pages (from-to)2191-2196
Number of pages6
JournalFibers and Polymers
Volume14
Issue number12
DOIs
StatePublished - Dec 2013

Keywords

  • Capillary channel theory
  • Hydraulic permeability
  • Kozeny-Carman equation
  • Mean flow pore size
  • Permeability model

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