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计算了颗粒与高梯度磁选机介质间的碰撞效率,结果表明,在某些条件下,即使没有磁力吸引,其碰撞效率也能趋于1。此外,颗粒的捕集效率是由静力学磁偶极作用(介质与颗粒之间)与流体动力学剪应力及表面力间的相互影响决定的。磁选机所能捕集的颗粒粒度下限由颗粒与介质间的机械碰撞效率决定的,而与磁偶极作用无关。总的相互作用能受磁性相互作用和流体动力作用的影响,尽管在颗粒非常小时(半径<10~(-8)m)是表面力起主要作用。
The collision efficiency between the particles and the medium of high gradient magnetic separator was calculated. The results show that under some conditions, the collision efficiency can approach 1 even without magnetic attraction. In addition, the particle capture efficiency is determined by the interaction between the static magnetic dipole (media and particle) and hydrodynamic shear and surface forces. Magnetic separator can capture the lower limit of particle size particles and media by the mechanical collision between the efficiency of the decision, and has nothing to do with the magnetic dipole effect. The total interaction can be affected by magnetic interactions and hydrodynamic forces, although surface forces play a major role at very small particles (radius <10 -8 m).