Numerical comparison and design of magnets arrays for particle separating, based on magnetophoresis

Abstract

Abstract In this paper, based on magnetophoresis, the effects of magnets arrays changings on particle tracing are analyzed. The changing of magnets arrays are included the changings of magnets dimensions and also the changing of the space between them. Magnets arrays with different styles, have generated dissimilar magnetic field. Hence, in some cases the magnetic force is stronger. In these cases, the manipulation on particles are done in less time. The importance of this problem is related to increase the throughput of the microsystem.To conquer to this challenge analytical methods (mathematical piecewise method) in 2D platform are used. The path of particles in microchannel are predicted. Then, the changings in magnets arrays (gap-dimension) are inserted. Lastly, the comparison of distance, velocity, and time to find out the proper style are done.The results shown that for the specific surface area (volume in 3D platform), there is a particular magnets dimension with a particular spacing between them (gap-dimension). Which has performed a maximum effects on microparticles. The simulations for five surface area S1 = 40000 μm2, S2 = 62500 μm2, S3 = 90000 μm2, S4 = 122500 μm2, and S5 = 160000 μm2 are proceed. The results are describes as the couple of gap-dimension which the gap is the space between magnets and the dimension is the intersection of the magnets and the channel. The results of (gap-dimension) for specific surface area are listed respectively as: (500 μm−107 μm), (575 μm−127 μm), (650 μm–146 μm), (725 μm−164 μm), and (800 μm − 183 μm). The efficiency and throughput in this points are 100 percent for micro device. Because all of the particle are captured in the less time.Using the proper gap-dimension for the magnets arrays is led to maximize the efficiency and throughput of the microsystem.