Chen Jian, Furuichi Mikito, Nishiura Daisuke
Project Team for Development of Production Technology for Deep Ocean Resources, Japan Agency for Marine-Earth Science and Technology; 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan.
Center for Mathematical Science and Advanced Technology, Japan Agency for Marine-Earth Science and Technology; 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan.
Materials (Basel). 2020 Mar 8;13(5):1208. doi: 10.3390/ma13051208.
The mixing processes of granular materials have gained wide interest among various fields of science and engineering. In this study, our focus is a mixing process for offshore mining. We conducted numerical simulations using the discrete element method (DEM) in comparison with experimental works on mixing color sand. Careful calibration of initial packing densities has been performed for the simulations. For validation, the steady-state torques on the mixer head, the maximal increase of surface height after mixing, and the surface mixing patterns have been compared. The effect of particle size on the simulation results has been clarified. With the particle size approaching the actual particle size, consistent torques and mixing patterns indicate the capability of the DEM code for studying the particular mixing process, while the results for the maximal increase of surface height should be interpreted with more caution.
颗粒材料的混合过程在科学和工程的各个领域引起了广泛关注。在本研究中，我们关注的是近海采矿的混合过程。我们使用离散元法（DEM）进行了数值模拟，并与彩色沙子混合的实验工作进行了比较。在模拟中对初始堆积密度进行了仔细校准。为了验证，比较了搅拌头的稳态扭矩、混合后表面高度的最大增加量以及表面混合模式。明确了粒径对模拟结果的影响。随着粒径接近实际粒径，一致的扭矩和混合模式表明DEM代码能够研究特定的混合过程，而表面高度最大增加量的结果则应更谨慎地解释。
