Guan Z W, Dullah A R, Wang X L, Wang Q Y
Advanced Materials Research Centre, Technology Innovation Institute, Abu Dhabi, United Arab Emirates.
School of Mechanical Engineering, Chengdu University, Shiling Town, Chengdu 610106, China.
Heliyon. 2023 Jan 25;9(2):e13179. doi: 10.1016/j.heliyon.2023.e13179. eCollection 2023 Feb.
This paper presents the development of numerical modelling to simulate thermal and moisture mapping of layered cricket helmets. The 3D laser scanning methodology was used to obtain geometrical data of a dummy human head with non-ventilated (NVL) and ventilated (VL) helmets to generate the meshes. Here, heat transfer and mass diffusion were applied in the finite element simulations to model the temperature and relative humidity (RH) distributions inside NVL and VL helmets, which were processed as the temperature-time and RH-time charts. The simulated results were validated against the corresponding experimental measurements with reasonably good correlation, in terms of the general trend on reginal temperature and RH against time, although parameters such as helmet movement and local sweating were not considered in the modelling to simplify the simulation. The discrepancies between the FE simulation results and the measurements are generally within 7% for in-helmet temperature and 5% for RH, for both types of helmets in the low ambient conditions (20 °C and 50% RH), although such the discrepancy is about 10% for the VL helmet subjected to the high ambient conditions (35 °C and 30% RH). The models developed are ready to be used for parametric studies on non-ventilated helmet to optimize the ventilation openings for improving the thermal comfort.
本文介绍了用于模拟分层板球头盔热湿分布的数值模型的开发。采用三维激光扫描方法获取佩戴无通风孔（NVL）和通风孔（VL）头盔的人体头部模型的几何数据，以生成网格。在此，在有限元模拟中应用热传递和质量扩散来模拟NVL和VL头盔内部的温度和相对湿度（RH）分布，并将其处理为温度-时间和RH-时间图表。尽管在建模过程中未考虑头盔运动和局部出汗等参数以简化模拟，但模拟结果与相应的实验测量结果在区域温度和RH随时间变化的总体趋势方面具有合理的良好相关性。在低环境条件（20°C和50%RH）下，两种类型头盔的有限元模拟结果与测量值之间的差异，头盔内部温度一般在7%以内，RH在5%以内，尽管在高环境条件（35°C和30%RH）下，VL头盔的差异约为10%。所开发的模型可用于对无通风孔头盔进行参数研究，以优化通风口，提高热舒适性。
