非磁性微粒的负磁泳-惯性组合分选研究

Investigation on a Negative Magnetophoretic-inertial Combined Sortor for Non-magnetic Microparticles

为了分选颗粒直径十分接近的非磁性颗粒,数值计算了负磁泳耦合的惯性分选器在不同磁场强度、微通道结构参数、入口速度和速度比情况下3μm、4μm、5μm的三种颗粒的侧向偏移,结果表明:颗粒的侧向迁移随磁场强度和颗粒尺寸的增大而增大;颗粒的分离效率随着入口流速的减小和入口流速比的增大而提高;越小的微通道结构参数Ha/Hb和越大的扩张区扩张比,都有利于颗粒分离。计算结果部分得到了激光诱导荧光图像实验的验证,证明了数值模型的有效性。

In order to sort non-magnetic micro-particles with a very close diameter,lateral migration of negative magnetophoretic coupled inertial sorter might be numerically calculated for 3 kinds of non-magnetic particles of 3μm,4μm,5μm in different magnetic fields for different microchannel parameters,different inlet velocities and velocity ratios of two inlets.The numerical results show that,greater lateral migration of non-magnetic particles are induced by more powerful magnetic field and bigger particle diameters.Separation efficiency of non-magnetic particles promotes when lower inlet velocity and greater inlet-velocity ratio.Moreover,smaller H a/H b and larger extension proportion in sorter are beneficial to particle separation.Partial numerical results verified by laser induced fluorescence experiments may prove the validity of numerical model.