Application of Cross-sectional Capacitance Tomography for Particle Migration in a Microchannel

N. T. Ali Othmana,b, M. Takeia and H. Obarac

aGraduate School of Mechanical Engineering, Division of Artificial System Science, Chiba University, 1-33 Yayoi, Inage, Chiba, 263-8522 Japan

bDepartment of Chemical Engineering, Faculty of Engineering and Build Environment, National University of Malaysia, 43600,

Bangi, Selangor, Malaysia

cDepartment of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minamioosawa-Osawa, Hachiouji, 192-0397 Japan

Abstract

A fine particle cross-sectional concentration in a microchannel is determined by a high speed multiplexer and multi-layer capacitance technique to discuss initial concentration effect and stream transitional migration. The polystyrene particles as a solid phase and non-conductive deionized water as a liquid phase are non-uniformly injected into inlets microchannel. The results shows particles move away from center towards wall vicinity area and particles migrated towards the wall increased in outlet area. The stream transitional particle migration is investigated with the effect of initial concentration and shows the migration ratio increase with increment of initial concentration.

Keywords: Microchannel; capacitance tomography; multi-layer electrodes; particle concentration; stream transitional migration