Ahmed Tahan
Damietta University, Egypt
Title: Pressure Differences between the Human Micro Climates and the Environment Through Fabrics
Biography
Biography: Ahmed Tahan
Abstract
one of the important variable in vapour transport investigation that it has not investigated physiologically by the skin vapour pressure or human microclimate pressure. It was found that most of textile fabrics have superior properties in moisture wicking ability, diffusely and evaporation ability. The physical properties of the fabric’s material and construction (structure & design) as well as the physical activities of the human body have been considered associated with the thermal properties of the fabrics. The four parameters of heat transfer such conduction, convection, radiation and vapour transfer diffusely through the garment have been considered. The fabric materials and construction comfort have been investigated by two compromised types of fabrics as such cotton and cotton blended polyester. The fabric investigated at three different phases as such dry moist and wet showed a very interested behaviour where the fabric at maximum holding water transfers 12 times the dried fabric. However, the most interested behaviour is demonstrated by the maximum water absorption of 80%RH followed by the 50% RH whilst the lowest heat transfer conducted by the 20%RH.The present research showed that the pressure difference between the skin pressure through the micro climate and the pressure of the ambient condition at wet phase has reached up to 5 times the dry condition. In this aspect, a mathematical model has been developed to describe the dynamic heat and moisture transport behaviour. Not only that but also it has shown regardless of type of fibres either synthetic or nature ,comfortability depend upon Thermal Effective Resistance Volume as a large factor influenced wearing regardless to the ability of fibres to absorb water .however it is also based on the pressure difference between the human micro climate and ambient condition
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Recent Publications :
- Booth .J .E. Principle Textile Testing. CBS Publishers & Distributors Pvt. Ltd. (1996) ISBN 10: 8123905157
- G. Song (2011).Improving Comfort in Clothing. Wood head Publishing ISBN: 978-1-84569-539-2.
- N, Hequet E, Cabrales L, Gannaway J, Wilkins T, Wells .LW (2008) Evaluating cell wall structure and composition of developing cotton fibers using Fourier transform infrared spectroscopy and thermo gravimetric analysis. J ApplPolymSci 107:476–486. doi:10.1002/app.27100.
- French AD, Goyner WR, Rouselle MS, Thibodeaux DP (2004).Cotton fiber and moisture-some of the basics. In: Proceedings of the national cotton council belt wide cotton conference, 5–9 Jan, San Antonio, TX, pp 2990–2994.
- Johan K. Westin.2008)An Improved Thermoregulatory Model for Cooling Garment Applications with Transient Metabolic Rates. University of Central Florida. ISBN .054995971