Optimization of Wellbore Annulus Cleaning Tool Based on CFD-DEM and Box-Behnken DesignWei Hu, Jinya Zhang, Ning Guan, Yanping Zhang, Binggui Xu and Hongwu ZhuE3S Web Conf., 573 (2024) 03010DOI: https://doi.org/10.1051/e3sconf/202457303010