Measurement of particle migration in micro-channel by multi-capacitance sensing method |
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| Affiliation: | 1. Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 46300 UKM Bangi, Selangor, Malaysia;2. Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minamioosawa-Osawa, Hachiouji 192–0397, Japan;3. Graduate School of Mechanical Engineering, Division of Artificial System Science, Chiba University, 1–33 Yayoi, Inage, Chiba 263–8522, Japan;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Mechanical Engineering, Changzhou University, Changzhou 213016, China;1. Department of Information and Computer Engineering, National Institute of Technology, Kisarazu College, 2-11-1, Kiyomidai-Higashi, Kisarazu, Chiba 292-0041, Japan;2. Division of Artificial Systems Science, Chiba University, 1-33, Inage, Chiba 263-8522, Japan;3. National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba, Ibaraki 305-8564, Japan;1. Power Engineering Faculty, University Politehnica of Bucharest, Romania;2. Luleå University of Technology, Sweden and the Norwegian University of Science and Technology, Norway |
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| Abstract: | Study of particle migration is important to enhance and increase the efficiency of the positioning and sorting process in order to produce the high yield of desired product especially in microfluidic applications. In this study, in order to study particle migration, normalized particle concentration in a micro-channel has been calculated for high initial particle concentrations (ξ=3.0, 5.0 and 10.0%) and the small particle diameters (dp=1.3, 1.5 and 2.1 μm) by using capacitance data measured by a multi-capacitance sensing method. From the calculations, it has been observed that the particle concentration at the wall vicinity area is increased as ξ and dp are increased while the particle concentration at the center area is decreased. To analyze the tendency of the particle migration, two quantitative indicators are introduced, viz., streamwise migration ratio (Ψ) which is the ratio of particle concentration at the downstream to the upstream cross-section position, and the cross-sectional migration ratio (Φ) which is the ratio of the particle concentration at the wall to the center area at the same cross-sectional position. The result shows that the Ψ at the center area is decreased as the particles move along the channel irrespective of ξ and dp while the Ψ at the wall vicinity area is increased. Based on Ψ and Φ, it has been observed that the particle migrate from the center area towards the wall vicinity area in the case of low ξ and small dp while the particles tend to concentrate on the center area in the case of high ξ and the large dp. As a result, the particle concentration at center is higher in the case of the lower ξ and the smaller dp than that in the case of higher ξ and the larger dp. |
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| Keywords: | Particle concentration Micro-channel Multi-layered sensor electrodes Multi-capacitance sensing Particle migration Streamwise migration ratio Cross-sectional migration ratio |
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