Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 38, Issue 8, Pages 1686-1702Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-021-0795-3
Keywords
Microfluidic; Inertial Separation; Spiral Microchannel; Magnetoforsis; Permanent Magnet
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A novel microfluidic device is designed to focus microparticles based on inertial and magnetophoretic impacts, achieving 100% separation efficiency of polystyrene particles with three different sizes. High purity particle collection can be achieved using Halbach array of magnets, with optimal situations determined by investigating inlet flow velocity, magnets' configuration, and their distance from the microchannel.
Separation of microparticles is of great importance in diagnostic, chemical, and biological analysis, as well as food processing and environmental assessments. In the present work, a novel microfluidic device is designed to focus microparticles based on inertial and magnetophoretic impacts. Three permanent magnets are mounted in the vicinity of the microchannel to separate the diamagnetic particles suspended in a ferrofluid by applying a negative magnetophoretic force. Polystyrene particles with three sizes of 5, 10, and 15 mu m are separated from each other using the proposed device with 100% separation efficiency. The results show that high purity of particle collection can be achieved using Halbach array of magnets at Reynolds numbers of 100 and 110. The influence of inlet flow velocity, magnets' configuration, and their distance from the microchannel is investigated and the optimal situations are determined.
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