TY - GEN
T1 - Numerical analysis of electroosmosis in a micro-cavity
AU - Fernandes, Dolfred V.
AU - Kang, Sangmo
AU - Suh, Yong K.
PY - 2008
Y1 - 2008
N2 - The bulk motion of an aqueous solution induced by the application of DC and AC electric fields is studied numerically. The physical model consists of a rectangular micro-cavity filled with dilute, symmetric, binary electrolyte and two completely polarizable cylindrical electrodes. The electric double layer (EDL) model coupled with Navier-Stokes equations governing the electroosmotic flow has been described. The ion-transport in the domain is obtained by solving Poisson-Nernst-Plank equations. We employed IB (immersed boundary) technique for the implementation of boundary conditions and semi-implicit fractional-step method for solving the momentum equations. The Poisson equation for potential distribution is coupled with Nernst-Plank equations for ionic species distribution and solved using CGSTAB iteration solver. Numerical codes are validated using bench-mark problems; driven-cavity-flow and flow over a cylinder. The electric field is almost completely balanced by the accumulation of the counter-ions at the electrodes, at steady state the potential in the most part of domain is zero. The flow field is found predominant in the region near the electrodes.
AB - The bulk motion of an aqueous solution induced by the application of DC and AC electric fields is studied numerically. The physical model consists of a rectangular micro-cavity filled with dilute, symmetric, binary electrolyte and two completely polarizable cylindrical electrodes. The electric double layer (EDL) model coupled with Navier-Stokes equations governing the electroosmotic flow has been described. The ion-transport in the domain is obtained by solving Poisson-Nernst-Plank equations. We employed IB (immersed boundary) technique for the implementation of boundary conditions and semi-implicit fractional-step method for solving the momentum equations. The Poisson equation for potential distribution is coupled with Nernst-Plank equations for ionic species distribution and solved using CGSTAB iteration solver. Numerical codes are validated using bench-mark problems; driven-cavity-flow and flow over a cylinder. The electric field is almost completely balanced by the accumulation of the counter-ions at the electrodes, at steady state the potential in the most part of domain is zero. The flow field is found predominant in the region near the electrodes.
UR - http://www.scopus.com/inward/record.url?scp=77952594569&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77952594569&partnerID=8YFLogxK
U2 - 10.1115/ICNMM2008-62308
DO - 10.1115/ICNMM2008-62308
M3 - Conference contribution
AN - SCOPUS:77952594569
SN - 0791848345
SN - 9780791848340
T3 - Proceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
SP - 475
EP - 481
BT - Proceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
T2 - 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
Y2 - 23 June 2008 through 25 June 2008
ER -