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This study focuses on the applicability of finite element method (FEM) to analyze the heat transfer behavior of plain interlock weft knitted fabrics. An interlock weft knitted fabric model is developed and analyzed using FEM software. A comparison of the experimental measurements with the numerical solutions shows that the FEM model developed for t...
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... The authors found that the finite element method could provide accurate and promising results in comparison to the experimental results. Hasani, Ajeli, and Nouri (2013) also discovered compatibility between the experimental and theoretical results obtained for the interlock knitted fabrics they investigated. Three-dimensional simulation of heat transfer through single jersey weft-knitted fabrics was performed by Puszkarz, Korycki, and Krucinska (2016). ...
The aim of this study was simulating the temperature distribution in course-wise extended weft-knitted fabrics by considering different extension levels. Accordingly, three types of weft-knitted fabrics structured in plain single jersey, plain rib, and interlock patterns were prepared using an electronic flat knitting machine. The fabrics were then exposed in a course-wise manner to three different extension levels (0%, 15%, and 30%) from which their heat transfer features at an extended state could be measured, by using the hot plate instrument and an infrared thermal camera. For the theoretical evaluation of temperature distribution, the fabrics’ corresponding geometrical unit cells were established in a finite element software environment. There was an acceptable agreement between the experimental and modeling results. It was also shown that applying different extension levels could significantly affect the knitted fabrics’ temperature distribution.
The thermal properties of fabric have significant impact on thermal comfort of the wearers. This research work covers the development of geometrical models of plain weft knitted fabric structures and evaluation of the thermal properties by using the fluid surface interaction technique. The results obtained from the numerical method were compared with the experimental results, and it was found that they were highly correlated. Furthermore, the validated models were utilized to evaluate the velocity and temperature profile of air at out-plane created over the surface of knitted fabric.
The thermal conduction properties of 2.5D angle-interlock woven composites (2.5DAWC) were investigated along warp, weft and thickness directions both from experimental measurement and finite element analyses (FEA). A self-designed apparatus was established to measure the thermal conductivity of 2.5DAWC. The multi-scale FEA models were selected from representative volume elements (RVE) of matrix, yarns and composites by detailed geometrical structural analyses. The micro-scale models including the matrix-voids RVE and the fiber-matrix RVE were used to calculate the thermal properties of resin matrix and yarns, respectively. The meso-scale model was created to analyze the overall thermal conduction behaviors of 2.5DAWC, including the temperature and heat flux distributions. The effects of voids and interface thermal contact resistance on the thermal conductivity were also considered and analyzed in this paper. The results from FEA showed reasonable agreement with the experimental with an error of less than 5%. The methodology of this paper could be applied to understand the thermal conduction behaviors of complicated structural composites, and also can be used to predict the coupled thermal-mechanical properties of composites.
