Numerical modeling of the air permeability of two-layer woven structure ensembles

Kyosov, Miroslav; Angelova, Radostina A.; Stankov, Peter

doi:10.1177/0040517515619358

Cited by 6 publications

(6 citation statements)

References 12 publications

(16 reference statements)

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“…The reason for not using an additive dependence, like in the case of thermal resistance, is that the air permeability of the system is preconditioned by the air permeability of the most impermeable layer, but it is always lower. 22 Therefore we suggest the air permeability of the system AP system to be presented as a dependent from the product of the air permeability of the single layers. The product of the values for the single layers is much closer to the reality than the sum of them.…”

Section: Resultsmentioning

confidence: 99%

“…These results are in a good correlation with other findings in the literature. 2,5,22 Yoo et al 2 explained the lower values of the thermal resistance of the system with the occurrence of forced convection between the layers during their testing. However, that explanation could not be attributed to the current study, as one and the same conditions were applied for testing of the single layers and the system.…”

Section: Thermal Resistancementioning

confidence: 99%

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The effect of the transfer abilities of single layers on the heat and mass transport through multilayered outerwear clothing for cold protection

Angelova

Reiners

Georgieva

et al. 2017

Textile Research Journal

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This paper deals with performance properties related to human thermo-physiological comfort of three-layer textile systems used for the production of outerwear for cold protection. The transfer of heat and fluids through the compound single layers (woven and non-woven) is investigated and compared to the heat and mass transfer of the systems for clothing. Six characteristics are measured for both single layers and systems of layers: thermal resistance, air permeability, water vapor resistance, relative water vapor permeability, the accumulative one-way transport index and overall moisture management capacity. For each of the characteristics, regression analysis is applied to prove or reject the proposed mathematical dependencies between the transfer abilities of the single layers and the respective systems. The results obtained showed that the fluid transfer abilities of the single layers applied in clothing for cold protection strongly affect the fluid transfer ability of the system of layers, while the heat transfer of the system is dominated by the heat transfer ability of the thermo-insulating layer. The proposed approach for assessment of the transfer processes through a system of layers for the production of outerwear for cold protection could be successfully applied in the design of other textile and clothing items, produced by using systems of different textile layers.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Resistancementioning

confidence: 99%

The effect of the transfer abilities of single layers on the heat and mass transport through multilayered outerwear clothing for cold protection

Angelova

Reiners

Georgieva

et al. 2017

Textile Research Journal

Self Cite

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“…According to UNI EN ISO 9237 standard, air permeability is defined as air flow rate penetrating the unity area of the test specimen under specified values of the pressure difference and the test duration. Kyosov et al (2016) investigated air permeability of ensembles of two woven structures by applying the FLUENT CFD software. The mathematical model was based on Reynolds-averaged Navier-Stokes (RANS) partial differential equations plus the continuity equations.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that air permeability was strongly influenced by the order of arrangement of the layers and distance between them. The lowest air permeability coefficient was obtained when distance between layers was 3-5 mm (Kyosov et al, 2016). S. S. H. Dehkordi et al (2017) used two different k-e and k-x turbulence models from the group of the Eddy Viscosity Models (EVMs) to simulate air permeability of knitted fabrics with rib and interlock structures.…”

Section: Introductionmentioning

confidence: 99%

Prediction of air permeability coefficient and water-vapor resistance of 3D textile layer

Gadeikytė

Abraitienė

Barauskas

2021

The Journal of The Textile Institute

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This study presents a computational model for investigation of the air permeability coefficient and water-vapor resistance coefficient through 3D textile layer. The effective values of the coefficients are highly dependent on the volumetric internal structure of the layer. The computational study of air and water vapor flow has been performed a microscale finite element model of the representative volume of the textile layer by taking into account the real configuration the yarns and filaments. The effective values of the coefficients were obtained by using taking average values of air and water vapor fluxes through the thickness of the representative volume. The steady state computational models in micro scale are based on Navier-Stokes and Brinkman partial differential equations. The simulations were performed in Comsol Multiphysics 5.3a software environment by using laminar flow (.spf) application mode. Numerical results for the air permeability of the samples were obtained, analyzed and validated by comparing against experimental data. Good agreement with experimental data has been achieved. HIGHLIGHTS COMSOL software was used to simulate air permeability and water-vapor resistance of 3D textile layer. The numerical model has demonstrated its efficiency comparing with experimental air permeability measurements.

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“…Rief et al (6) developed a 3D model of woven fabric by virtual and 3D reconstruction method in order to evaluate the air permeability by Computational Fluid Dynamics (CFD) simulation. Kyosov et al (7) investigated the air permeability through the thickness of the layered woven fabric by means of CFD, using the theory of jet systems. They also analysed the effect of distance between the layers on air flow velocity.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Air Permeability of Knitted Fabric by Using Computational Method

Siddiqui¹,

Ali²,

Zubair³

et al. 2018

Tekstil Ve Konfeksiyon

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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.

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Numerical modeling of the air permeability of two-layer woven structure ensembles

Cited by 6 publications

References 12 publications

The effect of the transfer abilities of single layers on the heat and mass transport through multilayered outerwear clothing for cold protection

The effect of the transfer abilities of single layers on the heat and mass transport through multilayered outerwear clothing for cold protection

Prediction of air permeability coefficient and water-vapor resistance of 3D textile layer

Prediction of Air Permeability of Knitted Fabric by Using Computational Method

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