摘要
To investigate the flow behaviors of different size particles in hydrocyclone,a designed process was numerically simulated by the transient solver,where the quartz particles possessing a size distribution were injected into a 100 mm diameter hydrocyclone with the steady water field and air core inside.A lab experimental work has validated the chosen models in simulation by comparing the classification efficiency results.The simulated process shows that the 25 μm quartz particles,close to the cut size,need much more time than the finer and coarser particles to reach the steady flow rate on the outlets of hydrocyclone.For the particles in the inner swirl,with the quartz size increasing from 5 to 25 μm,the particles take more time to enter the vortex finder.The 25 μm quartz particles move outward in the radial direction when they go up to the vortex finder,which is contrary to the quartz particles of 5 μm and 15 μm as they are closely surrounding the air core.The studies reveal that the flow behaviors of particles inside the hydrocyclone depend on the particle size.
为研究水力旋流器内不同粒度颗粒的流动行为,设计了这样一个过程:将具有一定粒度分布的颗粒群注入一个具有稳定流场与空气柱的直径为100 mm的水力旋流器中,并通过瞬态求解器来模拟这一过程。通过比较分级效率结果,用实验验证了数值模拟所选择的数值模型。模拟过程表明:相比于粗颗粒与细颗粒,接近分离粒度的25μm石英颗粒需要消耗更多的时间在旋流器的出口形成稳定的质量流率。随着粒度从5μm增加到25μm,处于内旋流中的颗粒需要更多的时间才能进入溢流管。25μm石英颗粒在上升至溢流管的过程中在径向上朝外运动,这与5μm和15μm石英颗粒向上运动时紧紧包围空气柱的现象刚好相反。研究结果表明:颗粒在旋流器内的流动行为是依赖于颗粒粒度的。
基金
Projects(2006BAB11B07,2007BAB15B01)supported by the National Science&Technology Pillar Program during the Eleventh Five-year Plan Period,China
Project(2011BAB05B01)supported by the National Science&Technology Pillar Program during the Twelfth Five-year Plan Period,China
