Electroosmotic Flow Driven by DC and AC Electric Fields in Curved Microchannels

スポンサーリンク

概要

• 論文の詳細を見る

• The purpose of this study is to investigate electroosmotic flows driven by externally applied DC and AC electric fields in curved microchannels. For the DC electric driving field, the velocity distribution and secondary flow patterns are investigated in microchannels with various curvature ratios. We use the Dean number to describe the curvature effect of the flow field in DC electric field. The result implies that the effect of curvatures and the strength of the secondary flows become get stronger when the curvature ratio of $C/A$ (where $C$ is the radius of curvature of the microchannel and $A$ is the half-height of rectangular curved tube.) is smaller. For the AC electric field, the velocity distribution and secondary flow patterns are investigated for driving frequencies in the range of 2.0 kHz ($\mathit{Wo}=0.71$) to 11 kHz ($\mathit{Wo}=1.66$). The numerical results reveal that the velocity at the center of the microchannel becomes lower at higher frequencies of the AC electric field and the strength of the secondary flow decreases. When the applied frequency exceeds 3.0 kHz ($\mathit{Wo}=0.87$), vortices are no longer observed at the corners of the microchannel. Therefore, it can be concluded that the secondary flow induced at higher AC electric field frequencies has virtually no effect on the axial flow field in the microchannel.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2006-10-15

著者

• Luo Win-Jet

  Department of Electronic Engineering, Far East College, Tainan, Taiwan

• Chen Jia-Kun

  Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan

• Yang Ruey-Jen

  Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan

関連論文

• Analysis of Electrokinetic Mixing Using AC Electric Field and Patchwise Surface Heterogeneities
• Electroosmotic Flow Driven by DC and AC Electric Fields in Curved Microchannels
• Enhancement of Electrokinetically-Driven Flow Mixing in Microchannel with Added Side Channels

スポンサーリンク