摘要
细长柔性颗粒的循环流化在工业生产中应用广泛,其流化特性比球形颗粒和细长杆状颗粒复杂。该文采用离散元方法,根据多刚体动力学理论及动量守恒定理,引入细长链结构描述细长柔性颗粒的运动,建立了考虑其碰撞冲击和铰约束以及摩擦作用的颗粒运动数学模型,并根据所建立的模型,对一实际冷态提升管内气固两相流进行了数值模拟以研究细长柔性颗粒的分布特性。结果发现,提升管内细长柔性颗粒分布不均匀:通常管内底部区域颗粒较多,上部区域颗粒相对较少。且细长柔性颗粒在近壁区域分布较为密集,流化过程有颗粒结团现象,与工程试验结果一致。
Circulating fluidization of flexible slender particles has been extensively employed in industry. The fluidizing behaviors of flexible slender particles are more complicated than that of spherical particles and slender particles. Based on the discrete element method, multi-rigid-body dynamics and conservation of momentum, each flexible slender partic/e was modeled as chains of/inked rigid bodies. The model included realistic features, such as contact forces between particles, joint constraint and friction action. The gas-solid two-phase flows in the riser were simulated using the current model to capture fluidizing behaviors of flexible slender particles. The research results show that particle distribution of flexible slender particles in the riser is not uniform： usually dilute at the top and dense at the bottom in the axial direction. Furthermore, flexible slender particles usually concentrate in the near-wall region and investigations of the particle mixing behavior in the simulated systems indicate that there are particle clusters during fluidization, which the consistent with our experimental results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第35期102-108,共7页
Proceedings of the CSEE
关键词
循环流化
细长柔性颗粒
流化特性
多刚体动力学
分布特性
circulating fluidization
flexible slender particles
fluidizing behaviors
multi-rigid-body dynamics
distribution characteristics
