Study On The Mechanism Of Wicking And Water Guiding Of Nanofiber Coated Filament Yarn

The capillary channel inside the yarn is the main factor affecting the moisture conductivity of textile materials.It is of great significance for the development of single guide wet and hot wet comfort fabrics.Through theoretical model and numerical simulation method,a two-scale water conduction model of lotus root pipe is established,which is consistent with the structure of water conduction channel of nano-coated yarn.The water conductivity mechanism of the double scale microcapillary structure parameters in yarns was studied,and the diameter of capillary channels in yarns was revealed.The effects of yarn twist,porosity and thickness of nano-layer on the moisture transfer behavior of nylon filament/nano-coated yarn.According to the yarn/yarn internal nano coated capillary channel and the two scale construction and outsourcing nano fiber layer water channel,constructed of filament yarn guide tube model and double water lotus scale water model and pipe joints,based on Darcy's law and the capillary pressure equation of wicking water guiding theory,deduced the standard core two dimensional water model and double pipe joints of pipe hydraulic model scale Oujie suction time equation,get influence of coarse details in the model and the length width ratio of joints and the two scale than the outer layer porosity of porous medium model of joints and thickness of hydraulic model,the corresponding analysis of nano coated capillary channel structure and yarn wicking effect of nano layer structure of the water guide mechanism.The establishment of hydraulic geometry model and nylon filament yarn and yrnn nano coating water channel is consistent,with the aid of the Fluent software single/double scale model in liquid water under surface tension spontaneous transport process was simulated,the effects of various parameters on the model of liquid water by surface tension transfer law of spontaneous movement.The simulation results of the numerical simulation,using Fluent postprocessing function image and the center line trajectory model of single/double scale flow model research model(x=0)in the joints of the moving length of liquid water each time,and draw the curve graph of each model in water wicking length and time,show effect the parameters of hydraulic conductivity on the water absorbing model core.The mathematical model and the numerical simulation results show that the yarn internal non-uniform two-dimensional tube coarse alternating frequency more details of joints,pipe heterogeneity more joints,the wicking rate is smaller,the wicking height of the lower dimensional balance;large diameter pipe joints will improve the wicking rate and equilibrium wicking height.The larger the porosity and the thicker the porous medium,the faster the wicking rate and the higher of the wicking balance height in the double scale flow model.The preparation of nylon filament yarn and nano-coated yarn with the same structure parameters as the water conduction model of lotus root tube/two-scale lotus root tube was investigated and the horizontal wicking experiments were carried out on the prepared yarn.The wicking height-time curve was verified by mathematical model and numerical simulation results.It shows that the larger the capillary channel width between the yarns is,the smaller the twist degree of the yarn is,the better of water absorption and conductivity of nylon filament yarn;For nano-coated yarns,the wicking capacity increases with the increase of porosity and thickness of nano-layer.And the experimental results are in agreement with the theoretical results.On the basis of this,the standard wicking time equation of three dimensional double scale lotus root nodal tube was established based on the geometry characteristics of 3D double scale lotus root nodal tube.The effect of geometric structure parameters on the water conductivity of the model was studied,and the simulation and numerical simulation of the water absorption and conductivity process of the three-dimensional two-scale lotus root tube were carried out.The results are consistent with that of two-dimensional two-scale lotus root nodal tubules.The theoretical and numerical simulation methods used in this study provide an effective way for the study of wicking behavior of fiber porous materials.To provide theoretical basis for improving functionality of fabric and thermal-moisture comfort of clothing.