Computational modeling and experimental validation of the air permeability of woven structures on the basis of simulation of jet systems

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

doi:10.1177/0040517513481869

Cited by 7 publications

(10 citation statements)

References 12 publications

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“…To model the woven sample, a transformation method was used which was described, applied and verified in detail in our previous work [12]. A tube-like porous structure of a woven textile - Figure 1.a, permits to consider each pore as a jet opening, and the fabric as an incorridor ordered jet system - Figure 1.b.…”

Section: Theoretical Background Of the Modeling Of A Woven Macrostrucmentioning

confidence: 99%

“…The following simplifications of the physical task were made due to the complexity of the woven macrostructure and approximation of the air flow through the pores as a jet system [12]: n the linear density of warp and weft threads did not change in length, n the thickness of the macrostructure, affected by the weave pattern, was measured experimentally, which determined the length of the pore (jet), n the size of the pores was set as equal for all pores within the virtual model.…”

Section: Theoretical Background Of the Modeling Of A Woven Macrostrucmentioning

confidence: 99%

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Numerical Study of the Effect of a Natural Convective Boundary Layer around the Human Body on the Transfer of Heat through a Textile Structure

Angelova

Stankov

Kyosov

2015

F&TinEE

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Heat losses from the human body occur through a barrier of one or more textile layers with particular permeability, thermal insulation, water absorption abilities, etc. The convective boundary layer (CBL) around the clothed body is disturbed during body movement, and the air layer between the body and the textile layer(s) is broken up, thus changing the heat transfer through the textile layer and its insulation abilities. The purpose of the present study was to evaluate the effect of the convective boundary layer around the human body on the heat transfer through a textile layer by numerical simulation, using Computational Fluid Dynamics and a commercial CFD software package, by means of the Finite Volume Method. A new approach for modeling a textile surface was applied based on the theory of jet systems. The results of the study indicated that heat transfer trough the textile barrier is strongly influenced by the speed of the convective layer around the human body and the textile layer placed in between the body and the environment.

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Section: Theoretical Background Of the Modeling Of A Woven Macrostrucmentioning

confidence: 99%

Section: Theoretical Background Of the Modeling Of A Woven Macrostrucmentioning

confidence: 99%

Numerical Study of the Effect of a Natural Convective Boundary Layer around the Human Body on the Transfer of Heat through a Textile Structure

Angelova

Stankov

Kyosov

2015

F&TinEE

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“…Air permeability is an important feature of fabrics (Sundaramoorthy et al, 2011) and is one of the main factors affecting the thermal comfort of the user (Angelova et al, 2013). ASTM D737-75 defines air permeability as air the rate of air flow passing perpendicularly through a known area under a prescribed air pressure differential between the two surfaces of a material (ASTM D737-96 1996).…”

Section: Introductionmentioning

confidence: 99%

“…The porosity is related to structural and geometric properties such as the type of yarns, warp and weft density, thickness etc. It determines thermal insulation efficiency and thermal comfort of garment (Angelova et al, 2013). Pile height has a significant effect on air permeability capacity of towel fabrics.…”

Section: Introductionmentioning

confidence: 99%

A study on comparison of air permeability properties of bamboo / cotton and cotton towels

Sekerden¹

2018

Sci. Res. Essays

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As a result of the literature review, it was observed that previous studies concentrated mainly on investigating the water absorption properties of towel fabrics, but limited studies analyzed air permeability properties of towel fabrics. The purpose of this study is to investigate the air permeability of bamboo / cotton and cotton towels produced with different pile heights and to analyze the effect and importance level of pile fiber type and pile height in these two types of towel fabrics. The paper presents an investigation of the air permeability ability of towel fabrics with respect to pile height and pile fiber type. Towel fabrics were produced under industrial conditions. 100% bamboo and 100% cotton yarns were used as pile yarns, while 100% cotton yarn was used as weft and ground warp yarn. The effect of pile fiber type and pile height on the air permeability properties of fabrics was compared using analysis of variance (ANOVA). The Design Expert 6.01 program was used for statistical analyses. It was found that air permeability of bamboo/cotton towel fabrics was higher than 100% cotton towel fabrics and the air permeability of both types of towels decreased as pile height increased.

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“…Our previous research has shown the applicability of a method for simulation of the AP of single-layer woven macrostructures, based on the jet system theory. 15,16 The method was tested numerically and verified with experimental results for the AP of real fabrics. The objective of the present study was to investigate numerically the AP of two-layer fabric ensembles.…”

mentioning

confidence: 99%

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

Kyosov

Angelova

Stankov

2016

Textile Research Journal

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This study aims at investigating air permeability in the transversal direction of pairs of woven textiles. Three samples of woven macrostructures with different characteristics are selected for the numerical investigation of 16 two-layer ensembles. Computational fluid dynamics (Reynolds-averaged Navier–Stokes equations) is used for modeling the air permeability, applying the theory of jet-systems: the flow through each of the layers in the ensemble is modeled as an “in-corridor” ordered jet-system. The influence of the order of arrangement of the layers in the ensemble is analyzed, indicating higher air permeability of the ensemble when a tighter structure is placed as a first layer. The effect of the distance between the two woven macrostructures is also analyzed, showing a strong influence on the flow development as well as on the extrema of flow velocities, especially in the drop of the flow velocity in the air gap between the two layers. The analysis made and the results obtained show that the method can be applied for further investigation of ensembles of textile layers.

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Computational modeling and experimental validation of the air permeability of woven structures on the basis of simulation of jet systems

Cited by 7 publications

References 12 publications

Numerical Study of the Effect of a Natural Convective Boundary Layer around the Human Body on the Transfer of Heat through a Textile Structure

Numerical Study of the Effect of a Natural Convective Boundary Layer around the Human Body on the Transfer of Heat through a Textile Structure

A study on comparison of air permeability properties of bamboo / cotton and cotton towels

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

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