Precision of Measurement of Water Vapor Resistance of Fabrics With Different Surface Roughness by a Skin Model

Skin models are used for determination of water and thermal resistance of fabrics. Measurement in these instruments starts with determination of water vapour resistance of a boundary layer above the sweating hotplate. In the second step, the hotplate is covered by the tested fabrics and the instrument measures WV resistance of the fabric and that of boundary layer. Afterwards, the difference between these measurements presents the required WV resistance of the measured fabric, provided that WV resistance of the boundary layer is in both measurements identical. However, fabric surface roughness may change WV resistance of the boundary layer in the second measurement. In the paper, the effect of the fabric surface on measurement precision is theoretically analyzed and experimentally verified by procedure, which provides same air surface friction during both steps of the measurement. Experiments confirmed certain but small effect of the fabric surface roughness on the measurement precision.

Keywords:

water vapour resistance, textile fabric, skin model measurement precision, surface roughness,

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1. Mukhopadhyay A, Midha VK. 2008. A review on designing the waterproof breathable fabrics part I: Fundamental principles and designing aspects of breathable fabrics. J. Industrial Text. Vol: 37(3), pp: 225-262.
2. Ertekin G, Marmarali A. 2011. Heat, air and water vapor transfer properties of circular knitted spacer Fabrics.Tekstil ve Konfeksiyon. Vol: 21(4), pp: 369–373.
3. Matusiak M. 2006. Thermal Insulation Properties of Single and Multilayer Textiles, Fibres & Textiles in Eastern Europe. Vol: 14, 5(59), pp: 98-112.
4. Hes L, Araujo M. 2010. Simulation of the effect of air gaps between the skin and a wet fabric on resulting cooling flow. Textile Res. J. 2010.Vol: 80(14), pp:1488–1497.
5. Baczek-Boguslawska M, Hes L. 2013. The effective water vapour permeability of wet wool fabric and blended fabrics. Fibres & Textiles in Eastern Europe. Vol: 21, 1(97), pp: 67-71.
6. Incropera FP, DeWitt PD. 2002. Fundamentals of heat and mass transfer. Willey, ISBN 0471386499, Cornell University. 7. Hes L., Baczek-Boguslawska M. 2018, November. The effect of surface roughness on determination of water vapour resistance of fabrics tested by a skin model. Proceedings of International Textile Conference CIRAT 8 (Ed. S. Benltoufa), Monastir, Tunisia.
8 Rekova M. 2010. The effect of the fabric structure on its measurement of water vapour permeability according to the ISO11092 (in Czech, unpublished BSc Thesis), Technical university of Liberec.

ISSN: 1300-3356
Yayın Aralığı: Yılda 4 Sayı
Yayıncı: Ege Üniversitesi Tekstil ve Konfeksiyon Araştırma & Uygulama Merkezi

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