Prediction of Air Permeability of Knitted Fabric by Using Computational Method

Abstract

Air permeability is one of the very important factors which need to be considered at the development stage of textile fabrics because it affects the comfort of the clothing. During normal and extreme environmental conditions human body releases heat and the heat can be controlled by the air exchange between the body and clothing microclimate and the external environment; the exchange phenomena depends on the air permeability of the fabric. The air permeability of fabric can be evaluated by both the experimental and computational methods. In this work, a computational method is used for the prediction of air permeability of fabrics. The geometrical model of weft knitted structures was generated by using the actual dimensional parameters of the fabric and was further analysed by applying appropriate boundary conditions. The simulated results obtained from computational analysis were compared to the experimental results. Furthermore, the validated models were further used to predict and analyse the effect of stitch length, stitch density and fibre volume fraction on the air permeability of the fabric.

Determining the Appropriate Fabric Type for Use in the Production of Cosmetic Textiles by Performance Tests

“…Because the sample FN-7 has the lowest fabric mass per unit area among all fabric samples. This shows the inverse relationship between air permeability and fabric mass per unit area parameters [15]. Nevertheless, the air permeability of the sample FN-5 higher than the sample FN-6, although the fabric mass per unit area is the highest.…”

Influence of fabric permeability on breathing phenomenon of supersonic parachute

“…For example, Liu et al used the ALE method to simulate the airdrop process of plane circular parachute, the results indicated that dynamic load decrease while the steady descent speed increase with the increase of canopy permeability. 17 The above FSI studies on permeable parachute are all based on the Ergun equation, the fabric permeability coefficients are corrected with the data of canopy fabric permeability tests, and could not be obtained by fabric structure parameters directly. Additionally, the permeability model used in above FSI research are all only applicable in incompressible flow.…”