Chun, Myung-Suk Lim, Jin-Myoung Lee, Dae Young 2024-01-20T18:34:06Z 2024-01-20T18:34:06Z 2021-09-05 2010-09 1226-119X https://pubs.kist.re.kr/handle/201004/131140 Recently, we introduced a secondary Dean flow in curved rectangular microchannels by applying the finite volume scheme with a SIMPLE (semi-implicit method for pressure-linked equations) algorithm for the pressure-driven electrokinetic transport (Yun et al., 2010). This framework is based on the theoretical model coupled with the full Poisson-Boltzmann, Navier-Stokes, and the Nernst-Planck principle of net charge conservation. To explore intensively the effect of fluid inertia on the secondary flow, both the applied pressure drop Delta p/L and the channel curvature WIR(c) are changed for three kinds of rectangular channel cross section with considering the electric double layer and fluid slip condition. Simulation results exhibit that the square channel (i.e., channel aspect ratio similar or equal to 1) gets the higher axial velocity, compared to the others. The change of its skewed velocity profile from inward to outward was found with increasing fluid inertia caused by increasing Delta p/L, due to the reduced spanwise pressure gradient. The curvature introduces the presence of pairs of counter-rotating vortices perpendicular to the flow direction. Although the square channel shows a different feature of very close pattern in the vorticity profile, the total magnitude of average vorticity increases commonly in all cases with increasing either Delta p/L or WIR(c), providing scaling relations with the almost same value of exponent 2. It is obvious that the role of fluid inertia should explicitly be understood for a precise design of microfluidic chips taking arbitrary channel aspect ratios. English KOREAN SOC RHEOLOGY ELECTROKINETIC FLOW CAPILLARY-ELECTROPHORESIS RECTANGULAR MICROCHANNELS LAMINAR-FLOW PRESSURE GEOMETRY SLIP The role of fluid inertia on streamwise velocity and vorticity pattern in curved microfluidic channels Article 1 KOREA-AUSTRALIA RHEOLOGY JOURNAL, v.22, no.3, pp.211 - 218 KOREA-AUSTRALIA RHEOLOGY JOURNAL 22 3 211 218 scie scopus kci other ART001481802 000282597900011 2-s2.0-78649783177 Mechanics Polymer Science Mechanics Polymer Science Article ELECTROKINETIC FLOW CAPILLARY-ELECTROPHORESIS RECTANGULAR MICROCHANNELS LAMINAR-FLOW PRESSURE GEOMETRY SLIP microfluidics curved channel secondary flow fluid inertia vorticity streamwise velocity electrokinetics