Baffles with shape of ＂-＂ （single baffle）, ＂＋＂ （cross-baffles with four arms） and （baffles with 6 arms） are used to enhance the mixing of particles in a rotating drum mixer. A micro-dynamics study of mixing...Baffles with shape of ＂-＂ （single baffle）, ＂＋＂ （cross-baffles with four arms） and （baffles with 6 arms） are used to enhance the mixing of particles in a rotating drum mixer. A micro-dynamics study of mixing and segregation ofa bi-disperse system of two particle sizes in the rotating drum with these three kinds of baffles is carried out using the discrete element method （DEM）. The effect of the baffles on mixing, and the mechanisms of mixing enhancement by the baffles are discussed and analyzed. Simulation results show that in an unbaffled drum mixer, particle convection, particle diffusion, and size segregation of hi- disperse particles, all play important roles in the mixing process; whereas size segregation will be largely restrained when the drum mixer has a baffle, regardless of its shape, and the degree of mixing is higher than that in an unbaffled drum mixer. The different mixing characteristics for ＂-＂ shaped baffle, ＂＋＂ baffle, and baffle are revealed by the simulation results. For ＂＋＂ or style baffles, there is an optimal size of baffles for the mixing of particles, and the ootimal mixing efficiency is higher than that for ＂-＂ baffle.展开更多
圆筒混合机托辊发生点蚀破坏是一种常见的失效形式,针对某Φ5 m×24 m的圆筒混合机短时间内产生点蚀的托辊进行载荷分析、材料力学性能分析、硬度试验分析、金相组织试验分析及点蚀扫描电子显微镜(Scanning Electron Microscope,SEM...圆筒混合机托辊发生点蚀破坏是一种常见的失效形式,针对某Φ5 m×24 m的圆筒混合机短时间内产生点蚀的托辊进行载荷分析、材料力学性能分析、硬度试验分析、金相组织试验分析及点蚀扫描电子显微镜(Scanning Electron Microscope,SEM)形貌观察,研究托辊点蚀失效的原因。研究结果表明,外界载荷和托辊材料本身性能并不是引起托辊短时间内产生点蚀的主要原因,托辊表面硬度不足是引起托辊短时间内点蚀的主要原因,因此,托辊更易产生点蚀、剥落和掉块,最终导致失效。展开更多
基金supported by the Science Foundation of Chinese Universitythe Zhejiang Provincial Natural Science Foundation of China (Grant No. Y1100636)
文摘Baffles with shape of ＂-＂ （single baffle）, ＂＋＂ （cross-baffles with four arms） and （baffles with 6 arms） are used to enhance the mixing of particles in a rotating drum mixer. A micro-dynamics study of mixing and segregation ofa bi-disperse system of two particle sizes in the rotating drum with these three kinds of baffles is carried out using the discrete element method （DEM）. The effect of the baffles on mixing, and the mechanisms of mixing enhancement by the baffles are discussed and analyzed. Simulation results show that in an unbaffled drum mixer, particle convection, particle diffusion, and size segregation of hi- disperse particles, all play important roles in the mixing process; whereas size segregation will be largely restrained when the drum mixer has a baffle, regardless of its shape, and the degree of mixing is higher than that in an unbaffled drum mixer. The different mixing characteristics for ＂-＂ shaped baffle, ＂＋＂ baffle, and baffle are revealed by the simulation results. For ＂＋＂ or style baffles, there is an optimal size of baffles for the mixing of particles, and the ootimal mixing efficiency is higher than that for ＂-＂ baffle.
文摘圆筒混合机托辊发生点蚀破坏是一种常见的失效形式,针对某Φ5 m×24 m的圆筒混合机短时间内产生点蚀的托辊进行载荷分析、材料力学性能分析、硬度试验分析、金相组织试验分析及点蚀扫描电子显微镜(Scanning Electron Microscope,SEM)形貌观察,研究托辊点蚀失效的原因。研究结果表明,外界载荷和托辊材料本身性能并不是引起托辊短时间内产生点蚀的主要原因,托辊表面硬度不足是引起托辊短时间内点蚀的主要原因,因此,托辊更易产生点蚀、剥落和掉块,最终导致失效。
