静電容量測定法によるマイクロ流路内の微粒子濃度分布の計測

概要

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Initial concentration condition effect of particle cross-sectional concentrations of particle suspension two phase flows in a microchannel have been investigated. The cross-sectional capacitances between 12 sensor electrodes have been measured by a high speed multiplexer and multi-layer capacitance measurement technique in order to determine the particle concentration. The polystyrene particles as a solid phase and non-conductive deionized water as a liquid phase are non-uniformly injected into inlets microchannel. The normalized particle concentration was calculated based on the multi-layer capacitance measurement from modified Maxwell equation. The particles are migrated from the upstream to downstream cross-section, particles move away from center streamlines to near the wall vicinity area and the number of the particles migration towards wall vicinity area are clearly increased near to the outlet area. The stream transitional particle migration due to lift forces is investigated with the effect of the initial particle concentration. The results shows the particle migration ratio decreased with the increment of the initial particle concentration where in case of initial particle concentration, ξ=3.0% it shows the higher particle migration ratio from the upstream to downstream cross-section than the initial particle concentration, ξ=5.0 or 10.0%.
日本混相流学会の論文