Kwon, Jae-Sung Maeng, Joo-Sung Chun, Myung-Suk Song, Simon 2024-01-20T23:02:49Z 2024-01-20T23:02:49Z 2021-09-03 2008-07 1613-4982 https://pubs.kist.re.kr/handle/201004/133348 This paper addresses the effects of microchannel geometry with electrically insulating posts on a particle flow driven by electrokinesis and dielectrophoresis. An in-house numerical program is developed using a numerical model proposed in literature to predict particle flows in a microchannel with a circular post array. The numerical program is validated by comparing the results of the present study to those in the literature. Results obtained from a Monte-Carlo simulation confirm the three particle flow types driven by an external DC electric field: electrokinetic flow, streaming dielectrophoretic flow, and trapping dielectrophoretic flow. In addition, we study the effects of electrokinetic and dielectrophoretic forces on particle transports by introducing a ratio of lateral to longitudinal forces exerted on a particle. As a result, we propose an improved microchannel geometry to enhance particle transports across electrokinetic streamlines for a given power dissipation. The improved microchannel has a shorter longitudinal spacing between the circular posts than a reference microchannel. We also discuss the critical values of dimensionless variables that distinguish the three particle flow types for both improved and reference microchannels. English SPRINGER HEIDELBERG TOTAL ANALYSIS SYSTEMS ARRAY ELECTROPHORESIS CHIPS CAPILLARY-ELECTROPHORESIS ELECTROOSMOTIC FLOW SEPARATION TECHNOLOGY PARTICLES BACTERIA LIVE Improvement of microchannel geometry subject to electrokinesis and dielectrophoresis using numerical simulations Article 10.1007/s10404-007-0210-3 1 MICROFLUIDICS AND NANOFLUIDICS, v.5, no.1, pp.23 - 31 MICROFLUIDICS AND NANOFLUIDICS 5 1 23 31 scie scopus 000256010500003 2-s2.0-44249083976 Nanoscience & Nanotechnology Instruments & Instrumentation Physics, Fluids & Plasmas Science & Technology - Other Topics Instruments & Instrumentation Physics Article TOTAL ANALYSIS SYSTEMS ARRAY ELECTROPHORESIS CHIPS CAPILLARY-ELECTROPHORESIS ELECTROOSMOTIC FLOW SEPARATION TECHNOLOGY PARTICLES BACTERIA LIVE electrokinesis dielectrophoresis DC electric field insulating post