Three-dimensional heat transfer in a particulate bed in a rotary drum studied via the discrete element method

We simulated three-dimensional heat transfer inside a horizontal rotating drum using the discrete element method and a thermal conduction model.The aim was to determine the effect of end-wall heating on thermal behavior of a granular bed.The simulation showed that the end-wall heating significantly affects the axial temperature profile of the bed,particularly when the length-to-diameter ratio is low.Particles near the wall heated faster and became more thermally uniform than those in the center of the drum.The region affected by the end heating gradually increased over time.Increasing the rotation speed enhanced the heat conduction rate,and increasing the fill level reduced the mean temperature and thermal uniformity of the granular bed.Heat transfer was also simulated for drums with different length-to-diameter ratios.

Tsuzuki旋转式立体编织机编织件的结构模拟与设计

基于Tsuzuki旋转式立体编织机的编织工艺,通过分析编织过程中携纱器的运动路径,使用MATLAB软件编写算法获取纱线空间路径坐标,利用B样条曲线对纱线空间路径进行优化,将其实体化后获得编织件仿真模型,并使用仿真模型探究Tsuzuki编织机与四步法编织之间的相似性。结合三维细观结构模型构建方法和Tsuzuki旋转编织原理,设计工字梁与Y型管的仿真模型并且验证其可实施性。基于Tsuzuki旋转式立体编织机设计制备三维编织结构,并与仿真结构进行对比,结果显示模拟编织结构中的纱线形态与真实织物中纱线结构具有很好的一致性。