Water vapour transfer in waterproof breathable fabrics

Author:

Ruckman J.E.

Abstract

To assess the effect of wind speed in practice, experiments were conducted under conditions of realistic wind velocities generated in the climatic chamber. The theoretical and experimental results were compared. In the theoretical model of forced convection between the human skin and the external environment the water vapour transfer rate was found to be proportional to V0.81. The experimental results obtained when a layer of fabric was included showed that water vapour transfer is proportional to V0.5. The rates of water vapour transfer for the fabrics ranked slightly differently from that seen under steady state conditions; microfibre fabrics, cotton ventiles, PTFE‐laminated fabrics, hydrophilic‐laminated fabrics, and poromeric polyurethane‐laminated fabrics. Condensation was reduced under windy conditions.

Publisher

Emerald

Subject

Polymers and Plastics,General Business, Management and Accounting,Materials Science (miscellaneous),Business, Management and Accounting (miscellaneous)

Reference22 articles.

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2. 2.Weiner, L.I., “Moisture vapour transmission in textile fabrics”, Shirly Institute 3rd Seminar: Textiles in Comfort, 1971.

3. 3.Whelan, M.E., MacHattie, L.E., Coodings, A.C. and Turl, L.H., “The diffusion of water vapour through laminate with particular reference to textile fabrics”, Textile Research Journal, Vol. 25 No. 3, 1955, pp. 197‐222.

4. 4.Fourt, L. and Harris, M., “Diffusion of water vapour through textiles”, Textile Research Journal, Vol. 17 No. 5, 1947, pp. 256‐63.

5. 5..Eckert, E.R.G. and Drake, R.M. Jr, Analysis of Heat and Mass Transfer, McGraw‐Hill, New York, NY, 1972.

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