TY - JOUR
T1 - Electroosmotic flow in microchannels
AU - Yang, R. J.
AU - Fu, L. M.
AU - Lin, Y. C.
N1 - Funding Information:
This study was supported by the National Science Council of the Republic of China under Grants NSC-88-2218-E006-014. We appreciate helpful discussions with Professor D. Li of University of Toronto.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2001/7/1
Y1 - 2001/7/1
N2 - The electroosmotic flow induced by an applied electrostatic potential field through microchannels between two parallel plates and a 90° bend is analyzed in this work. A nonlinear, two-dimensional Poisson-Boltzmann equation governing the electrical double-layer field and the Laplace equation governing the electrostatic field distribution in microchannels are numerically solved using a finite-difference method. A body force caused by the interaction between the electrical double-layer field and the applied electrostatic field is included in the full Navier-Stokes equations. The effects of the electrical double-layer field and the applied electrostatic field on the fluid velocity distribution, pressure drop, and skin friction are discussed. A small pressure drop along the parallel plates is detected, although it is always neglected in the literature. Pressure is not a constant across the channel height. The axial velocity profile is no longer flat across the channel height when the Reynolds number is large. A separation bubble is detected near the 90° junction when the Reynolds number is large.
AB - The electroosmotic flow induced by an applied electrostatic potential field through microchannels between two parallel plates and a 90° bend is analyzed in this work. A nonlinear, two-dimensional Poisson-Boltzmann equation governing the electrical double-layer field and the Laplace equation governing the electrostatic field distribution in microchannels are numerically solved using a finite-difference method. A body force caused by the interaction between the electrical double-layer field and the applied electrostatic field is included in the full Navier-Stokes equations. The effects of the electrical double-layer field and the applied electrostatic field on the fluid velocity distribution, pressure drop, and skin friction are discussed. A small pressure drop along the parallel plates is detected, although it is always neglected in the literature. Pressure is not a constant across the channel height. The axial velocity profile is no longer flat across the channel height when the Reynolds number is large. A separation bubble is detected near the 90° junction when the Reynolds number is large.
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U2 - 10.1006/jcis.2001.7551
DO - 10.1006/jcis.2001.7551
M3 - Article
AN - SCOPUS:0035399806
VL - 239
SP - 98
EP - 105
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -