Experimental study of moisture diffusivity of fabrics

In order to measure and evaluate the moisture transfer characteristics in the fabric in the case of a steady state when the garment is worn on the human body,a three-step method was employed to determine the water vapor resistance of the whole apparatus at different liquid levels,the water vapor resistance upon fabric surface( air layer 1) and the water vapor resistance between the fabric' s lower surface and the water surface( air layer 2). The effective moisture diffusion coefficient in air layer 2 was determined by the regressive method,and then the effective moisture diffusion coefficient of fabric in the presence of air layer was computed. This method can effectively avoid the influence of the air layer on the test accuracy of measuring water vapor permeability of fabrics. The test results can reflect mass transfer characteristics of fabrics.