中文摘要：

将改进的插板／隔板技术与快速摄像图像处理技术相结合，对100mm×30mm×500mm喷动气固流化床内颗粒混合过程和混合行为进行了研究。同时引用统计学中相对标准差这一混合指数，系统地考察了喷动气速和流化气速对颗粒混合行为的影响。结果表明，颗粒混合随着时间的发展经历了3个连续阶段：宏观混合阶段、微观混合阶段和稳定混合阶段。在宏观混合阶段，对流混合占主导作用；在微观混合阶段，剪切混合也起了很大作用。增大喷动气速和流化气速均促使颗粒混合均匀，但过大的气速反而抑制了混合质量的进一步提高。由喷动气射流带动而形成的颗粒内循环是颗粒混合的主要机制。

英文摘要：

By combining the improved f/ashboard and digital image processing technique, the investigation on particle mixing behavior in a spout-fluid bed with a cross section 100 mm×30 mm and a height 500 mm was carried out. The mixing index was employed to investigate systematically the effects of spouting gas velocity and fluidizing gas velocity on the mixing. The results show that the particle mixing, according to time, undergoes three sequential stages： macro-mixing stage, micro-mixing stage and stable mixing stage. In the macro-mixing stage, convective mixing domains and shearing mixing plays an important role in micro-mixing stage. Meanwhile, the increasing spouting gas velocity and ftuidizing gas velocity promote particle mixing and but mixing worsen once the gas velocity exceeds certain velocity for the examined condition. Particle internal circulation drove by the spout jet should be the main mechanism of particle mixing.