Thermal Conductivity Of Woven Fabric And Its Numerical Simulation

With the advancement of technology and social production,people are paying more and more attention to sensory comfort and high demand for textile functions.As an important function of textiles,thermal comfort is an indispensable element of apparel design and consumer choice.At the same time,smart textiles are the new direction of technological transformation in the textile industry in recent years.The refinement of the structure and performance of fabrics has been studied as the basis for the development of smart textiles.Taking the meridional section of the plain weave fabric as an example,pedal spacing in the Peirce model,the buckling height of the weft yarn and the relation between the warp and weft yarn diameter and the maximum inclination of the weft yarn bending are analyzed from a geometric perspective.The formula for calculating the maximum inclination of the weft yarn is obtained.Then the relationship between the buckling limit of yarn and the warp and weft spacing and diameter of the fabric is analyzed.It can be used to determine whether any set of fabric parameters has a physical meaning.At the same time,based on the relative position change of the point at the maximum inclination angle of the fabric yarn bend,the correspondence between the warp yarn spacing,the buckling height of the weft yarn and the structure of the fabric is analyzed.On the basis of fabric structure analysis,the parameterized design of fabric heat conduction was established using MATLAB software,and the correctness of the program is verified.It is found that the numerical simulation results are in good agreement with the theoretical calculation results.After many numerical simulations,the relationship between fabric thermal properties and fabric parameters is quantified through data analysis.The results show that:(1)There is a linear relationship between the thermal resistance and the yarn of the fabric.With the increase of the yarn,the thermal resistance decreases,the thermal conductivity increases,and the heat flow increases.The effect of yarns on thermal resistance is related to the voidage and thickness of the fabric.(2)There is a linear relationship between the thermal resistance of the fabric and the structure.With the increase of the structure phase,the fabric thickness,voidage,and thermal resistance all decreased first and then increased.And the thermal resistance is the largest in the first structure phase,and the eighth structure phase is the smallest.And the void ratio is the highest in the first structure phase,and the fifth structure phase is the smallest.And the thickness characteristics are consistent with the voidage.(3)The material of the fabric also affects the thermal resistance.the thermal resistance of polychlorin is the largest and the thermal resistance of polypropylene is the smallest.(4)The influence of the basic fabric parameters on the thermal properties of the fabric is analyzed comprehensively.According to the results of the numerical experiments,the linear regression equations of the thermal resistance and basic parameters of the fabric and their correlations are obtained.