Numerical modeling of the air permeability of knitted fabric using computational fluid dynamics (CFD) method

Dehkordi, Seyedeh Sarah Hosseini; Ghane, Mohammad; Abdellahi, Sayyed Behzad; Soultanzadeh, Milad Babadi

doi:10.1007/s12221-017-7238-0

Cited by 18 publications

(10 citation statements)

References 11 publications

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“…In this method, a unit cell of a model can be analyzed and the obtained properties are assigned to the macro model for different load conditions. Recently, some researchers have employed equations developed by Vassiliadis [19] to create a geometry of the unit-cell of a single jersey weft knitted fabric for mechanical and fluid [26] analysis. Shekarchizadeh et al [27] also used finite element modeling in the meso scale to predict the mechanical behavior of a plain weft knitted composite.…”

Section: Introductionmentioning

confidence: 99%

The effect of loop density on the tensile behavior of biaxial weft knitted composites using both experimental tests and numerical method

Hessami

Yazdi

Mazidi

2019

Journal of Industrial Textiles

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In this study, a high-tenacity polyester was used to produce biaxial weft knitted fabric in three different loop densities. All of the composite samples were manufactured using the vacuum injection process. Epoxy resin was used as the matrix in the composite samples. Tensile tests in the course and wale directions were carried out on all samples. The results showed that the tensile strength and the elastic modulus of the composites were improved by increasing the loop density. On the other hand, multi-scale finite element modeling was employed to predict the elastic constants and the tensile strength of the composites. In this method, unit-cells of biaxial weft knitted fabrics with a script were modeled by ABAQUS finite element software in the meso scale. Periodic boundary conditions were applied to the unit-cells. Stiffness matrices of composites were calculated by a python code. In the macro model, a shell geometry was created and the elastic constants calculated from the meso scale were assigned to the macro model. The tensile strength of composites in the course and wale directions was predicted by the Tsai-Wu failure criterion equations. The numerical results had a good agreement with the experimental ones. According to the numerical results, the difference in the loop densities as the inputs data could be used and elastic constants and strength of composites in the course and wale directions could be obtained. So, this model is a useful method to predict the tensile behavior of biaxial weft knitted composites with different geometries.

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Section: Introductionmentioning

confidence: 99%

The effect of loop density on the tensile behavior of biaxial weft knitted composites using both experimental tests and numerical method

Hessami

Yazdi

Mazidi

2019

Journal of Industrial Textiles

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“…Mahmoud H. El Shakankery et al (2006) determined that theoretical model of porous systems based on D'Arcy's lows and liner models can be successfully used for the prediction of air permeability of nylon parachute fabrics. The results of the air permeability test for knitted fabrics with rib and interlock structures simulated by CFD technique confirmed that the increase in loop density of knitted fabric decreases the air permeability which also depends on knit type (Dehkordi et al, 2017). Eryuruk and Kalaoglu (2016) analysed the performance properties of knitted fabrics and determined a significant relationship between both elastane amount and count with air permeability.…”

Section: Introductionmentioning

confidence: 71%

“…Literature review reveals that the knitted fabrics are usually tested for the air permeability which depends on variety of factors, such as fabric porosity (Tou, 2005;Bhattacharya and Ajmeri, 2013;Imrith et al, 2016;Jordeva et al, 2017;Havlová and Špánková, 2017), course count and yarn number (Tou, 2005), loop length (Chidambaram et al, 2011), loop density and knit type (Dehkordi et al, 2017), thickness, tightness, yarn fineness and compactness (Bhattacharya and Ajmeri, 2013), raw material content ( Jordeva et al, 2017), etc. It was also considered that air will primarily flow through the inter-yarn pores in knitted fabrics; only in the case of highly dense fabrics may be considered that the part of the air may pass through the surface layers of the yarn (Havlová and Špánková, 2017).…”

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confidence: 99%

Evaluation of the air permeability of elastic knitted fabrics and their assemblies

Daukantienė

Vadeike

2018

IJCST

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Purpose The purpose of this paper is to evaluate the air permeability of knitted fabrics containing elastane fibre and their seams applying both the new approach based on fabric thickness measurement at different pressures and standard method. Design/methodology/approach Investigations were performed with commercially available eight polyester knitted fabrics containing different elastane yarn proportion. Bonded seams were laminated applying the urethane thermoplastic adhesive film of 0.175 mm thickness. Bonds were laminated by heat at 5.6 kPa pressure applying pressing device GTK DEA 25 R at 140°C temperature for 40 s duration. Sewn seams were assembled with 607 covering chain stitch applying 5.0 stitches per cm density and 512 overedge chain stitch applying 5.0 stitches per cm density. Specimens without and with the seams were conditioned in standard atmosphere conditions according to the standard LST EN ISO 139 before air permeability testing according to the standard LST EN ISO 9237. Standard thickness of the investigated knitted fabric was determined according to the standard EN ISO 5084. It is known from literature that the porosity is dominant factor influencing the air permeability of knitted fabrics. Therefore, the assumption was made that due to fabric porosity knitted fabric thickness being measured at different pressures also may differ. Thus, the permeability property may also be related to the difference between fabric’s thicknesses being measured under different pressures which may be applied with different material thickness gauges. Findings There was shown that fabric assemblies make the significant influence on the textile permeability to air. The results obtained indicate that the air permeability of the investigated knitted fabrics depends not only on their structure parameters but also on the fabric seam type. Air permeability of the specimens with the seams was lower than one of specimens without the seams. The highest decrease in permeability which ranged from 19.9 per cent up to 60.0 per cent was determined for the bonds. Fabric specimens with 607 covering chain stitch seam were in the second place with regard to the previously considered parameter. And, their permeability was decreased from 0.6 per cent up to 52.6 per cent. Changes in the air permeability of the specimens with 512 overedge chain stitch seam were lowest in the range of investigated assemblies. Based on the determined results, it was concluded that the thickness difference of the specimens with and without seams measured at different pressures is related to fabric porosity which makes the significant influence on the air permeability. Practical implications The samples of investigated fabrics were taken from the two companies which manufactures leisure clothing and sportswear such as skiing or swimming costumes, etc. Thus, the obtained investigation results are significant not only for clothing science but also leads the improvement of clothing quality in fashion industry. Originality/value Assuring the comfort of the human body is one of the most important functions of clothing, especially of sportswear and leisure wear. Knitted fabrics should not only be elastic, but also have high air permeability for easily transmit of the perspiration from the skin to the atmosphere, thus making the wearer to feel comfortable. In this research, the air permeability of commercially available polyester knitted fabrics containing different amount of elastane was investigated and the influence of fabric assemblies on the air permeability property was evaluated. A new approach based on the fabric thickness measurement at different pressures and the standard methods for the evaluation of air permeability were used.

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“…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. Geometry model of a unit cell of each sample was created by using CATIA software by Vassiliadis model, which considers the real shape of knit loop in three-dimensional space.…”

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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Numerical modeling of the air permeability of knitted fabric using computational fluid dynamics (CFD) method

Cited by 18 publications

References 11 publications

The effect of loop density on the tensile behavior of biaxial weft knitted composites using both experimental tests and numerical method

The effect of loop density on the tensile behavior of biaxial weft knitted composites using both experimental tests and numerical method

Evaluation of the air permeability of elastic knitted fabrics and their assemblies

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

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