Study on the Moisture Permeability of Warp-knitted Jacquard Shoe Upper Material based on CFD

Abstract

Abstract Developing warp-knitted Jacquard upper material is a lengthy process, and its performance test is complex. Therefore, predicting fabric performance by providing a method is of utmost importance. For this study, the areas of the shoe upper material that were most prone to wear and allowed greater breathability were taken as test samples. The impact of mesh structure and its distribution on the moisture permeability of shoe upper material was analysed using experiments and numerical simulations. SolidWorks modelling software was used for modelling the samples. Based on the fabric model, the effective structure is trimmed, and the fluid domain is isolated. The Fluent software was utilised to simulate numerically moisture permeability of the fluid domain model, and the measured outcomes were compared with the simulation results. The findings indicated that the simulated structure corresponded to the measured results, and the mesh structure heightened the moisture permeability of the upper material. Then, using the existing model as a basis, the yarn fineness and spacer yarn number of the spacer comb were altered independently to investigate how they influence moisture permeability in shoe upper material. The findings indicate that a decrease in yarn thickness enhances moisture permeability, and a smaller angle of inclination for the spacer yarn promotes water vapour transportation.