The Effect of Fabrıc Structural Geometry on Thermal Transfer Performance in Sportswear

Yıl 2019, Sayı: 17, 711 - 717, 31.12.2019

Sertaç Güney , Hilal Balcı İbrahim Üçgül

https://doi.org/10.31590/ejosat.629477

Cited By: 2

Öz

Especially for textiles, which
contain open structure pores, airflow carrying heat energy transfers from one
side to another side by conduction and convection. Convective heat transfer
plays a very important role in thermal transfer performance of textiles due to
its porous structure. Compression sportswear are generally produced from
knitted porous stretch fabrics, which get extended on wearing and remain in the
extended state. Since they are worn next to skin and are direct contact with
the body surface, their thermal comfort properties are effective on overall
clothing comfort. Perhaps the greater contact of the garment to the skin
together with the constant airflow can transfer the heat better from the body
to the environment. Most of the well-known auxetic materials possess porous
microstructures and the sizes of the pores of auxetic materials can vary during
the compressive and tensile deformation. In this study, an investigation has
been made to evaluate the auxetic effect on the thermal transfer performance of
clothing. Two type fabrics having the very similar fabric properties but
different knitting structures were provided from the market and producer. While
one has an auxetic structure, the other has a standard warp knitting structure
commonly used in market. As Permeability and porosity are strongly related to
each other, we compared air permeability of fabrics in extended state
considering the fabric extension results taken from virtual avatar having the
same body measurements as subjects in 3D simulation. Fabric surface temperature
changes on different clothed body parts investigated by an infrared thermal
camera and analysed in thermal camera software (Flir Tools) for thermal
transfer performance according to the wearing protocol. 

Anahtar Kelimeler

Fabric structural geometry, auxetic structure, thermal comfort

The Effect of Fabrıc Structural Geometry on Thermal Transfer Performance in Sportswear

Öz

Especially for textiles, which contain open structure pores, airflow carrying heat energy transfers from one side to another side by conduction and convection. Convective heat transfer plays a very important role in thermal transfer performance of textiles due to its porous structure. Compression sportswear are generally produced from knitted porous stretch fabrics, which get extended on wearing and remain in the extended state. Since they are worn next to skin and are direct contact with the body surface, their thermal comfort properties are effective on overall clothing comfort. Perhaps the greater contact of the garment to the skin together with the constant airflow can transfer the heat better from the body to the environment. Most of the well-known auxetic materials possess porous microstructures and the sizes of the pores of auxetic materials can vary during the compressive and tensile deformation. In this study, an investigation has been made to evaluate the auxetic effect on the thermal transfer performance of clothing. Two type fabrics having the very similar fabric properties but different knitting structures were provided from the market and producer. While one has an auxetic structure, the other has a standard warp knitting structure commonly used in market. As Permeability and porosity are strongly related to each other, we compared air permeability of fabrics in extended state considering the fabric extension results taken from virtual avatar having the same body measurements as subjects in 3D simulation. Fabric surface temperature changes on different clothed body parts investigated by an infrared thermal camera and analysed in thermal camera software (Flir Tools) for thermal transfer performance according to the wearing protocol. 

Anahtar Kelimeler

Fabric structural geometry, auxetic structure, thermal comfort

Kaynakça

• Liu, R., Little, T. and Williams, Jr., Compression Form-fitted Athletic Wear: Pressure Performance, Moisture Management Properties under Different Tension Ratios and Corresponding Psychophysical Responses, Fiber and Polymers, (2014), Vol.15 (3), pp.632-644.
• Gupta, D., Chattopadhyay, R. and Bera, M., Comfort properties of pressure garments in extended state, Indian Journal of Fibre&Textile Research, (2011), Vol.36, pp.415-421.
• D Fournet, D. and Havenith, G., (2017), Assessment of Sport Garments Using Infrared Thermography, Application of Infrared Thermography in Sports Science, Chapter 7, pp 159-183.
• Ma, P., Chang, Y., Boakye, A. and Jiang, G., (2017), Reviw on the knitted structures with auxetic effect, The Journal of The Textile Institute, Vol.108, 6, 947-961.
• Gibson,L. J., Ashby, M.F., Schajer, G.S. and Robertson, C.I., (1982), The mechanics of two-dimensional cellular materials, Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences, 382, 25-42.
• Hu H, Wang Z, Liu S (2011) Development of auxetic fabrics using flat knitting technology. Text Res J 81: 1493-1502.
• Liu Y, Hu H, Lan JKC, Liu S (2010) Negative Poisson's raito weft-knitted fabrics. Text Res J 80: 856-863.
• Glazzard M, Breedon P (2013) Weft-knitted auxetic textile design. Physica Status Solidi B 251: 267-272.
• Ugbolue SC, Kim YK, Warner SB, Fan Q, Yang C, et al. (2012) Engineered warp knit auxetic fabrics. Text Sci Eng 2.
• Alderson K, Alderson A, Anand S, Simkins V, et al. (2012) Auxetic warp knit textile structures. Physica Status Solidi B 7: 1322- 1329.
• Ma, P., Chang, Y., & Jiang, G. (2015). Design and fabrication of auxetic warp-knitted structures with a rotational hexagonal loop. Textile Research Journal.
• Wang, Z., & Hu, H. (2014a). 3D auxetic warp-knitted spacer fabrics. physica status solidi (b), 251, 281–288.