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首页> 外文期刊>Journal of Chemical Engineering of Japan >A Numerical Study of the Influence of Particle Density on Lift Force-Induced Separation in a Micro-Separator/Classifier by a Macroscopic Particle Model
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A Numerical Study of the Influence of Particle Density on Lift Force-Induced Separation in a Micro-Separator/Classifier by a Macroscopic Particle Model

机译：宏观颗粒模型对微分离器/分级机中颗粒密度对提升力分离的影响的数值研究

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A Macroscopic Particle Model (MPM),which can be regarded as a quasi direct numerical simulation and hence does not need any drag and lift force models,is applied to examine the effect of particle density on lift force-induced separation in a micro-separator/classifier.The computational domain is a 30-degrees arc channel with a radius of 20 mm connecting to 5-mm straight channels at the both ends.In this study the modeled is an upper-half of the channel with a width of 200 mu m and a depth of 75 mu m.The particle diameter was chosen to be 20 mu m,which is well separable in experiments and is suitable for MPM in which a particle should contain several fluid cells.The density was examined in the range of slightly lighter to denser,compared with water.The particle trajectories from representative points are predicted by MPM and also by a traditional particle tracking method (DPM) for comparison.The DPM without a lift force model predicted that the trajectories expanded over the cross-sectional plane with an increase of particle density since a secondary flow pattern called Dean vortices caused strong centrifugal force acting outwards from its center.On the other hand,the trajectories predicted by MPM were almost confined in the outer-half of the plane due to the lift force acting inwards to the vortex center.It seems that encountering lift force due to a steep shear and centrifugal force due to the Dean vortices are balanced regardless of the particle density since both forces likely increase with particle inertia.It is notable that particles can be hydraulically separable regardless of the density ranging slightly lighter to denser compared to the medium.
机译：可以将宏观颗粒模型（MPM）视为准直接数值模拟，因此不需要任何阻力和升力模型，用于检查颗粒密度对微分离器中升力引起的分离的影响/classifier.The计算域是一个30度弧形通道，其半径为20 mm，两端连接到5mm直通道。在本研究中，模型是宽度为200 mu的通道的上半部分深度为75μm，选择的粒径为20μm，在实验中可以很好地分离，适用于颗粒中应包含多个流体单元的MPM。在较小范围内检查密度MPM和传统的粒子跟踪方法（DPM）预测了代表点的粒子轨迹，以进行比较。没有举升力模型的DPM预测轨迹在交叉剖面上扩展了。由于称为Dean涡流的二次流动模式引起了强大的离心力从其中心向外作用，因此在整个平面上的粒子密度增加。另一方面，由于升力向内作用到涡旋中心，似乎由于陡剪切而产生的升力和迪安涡旋所产生的离心力是平衡的，而与颗粒密度无关，因为这两个力都可能随颗粒惯性而增加。与介质相比，无论密度范围是轻还是重，液压分离均可。

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