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

Abstract

Abstract: 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 Ha/Hb 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.

Key words: negative magnetophoresis, non-magnetic particle, inertial sorting, magnetic field intensity, numerical simulation

摘要： 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。

关键词: 负磁泳, 非磁性颗粒, 惯性分选, 磁场强度, 数值模拟

CLC Number:

TQ027

DU Jiayou1;GUO Wangcheng2;WANG Ruijin2;ZHU Zefei1,2. Investigation on a Negative Magnetophoretic-inertial Combined Sortor for Non-magnetic Microparticles[J]. China Mechanical Engineering.

杜加友1;郭望城2;王瑞金2;朱泽飞1,2. 非磁性微粒的负磁泳-惯性组合分选研究[J]. 中国机械工程.

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