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標題: 利用不對稱電極驅動微流道流體之性能分析
Analysis on Pumping Performance In Microchannel by Asymmetric Electordes
作者: 蘇脩聖
Su, Shiou-Sheng
關鍵字: electroosmotic;電滲流;micropumping;asymmetric electrode;微幫浦;不對稱電極
出版社: 機械工程學系所
引用: 1.H. Chen, Y. Zhang, I. Mezic, C. Meinhart, L. Petzold, "Numerical Simulation of an Electroosmotic Micromixer", Journal of ASME International Mechanical Engineering Congress&Exposition vol.259,2003,pp.653-658. 2.C.H. Lin, L.M. Fu, Y.S Chian, "Microfuidic T-Form Mixer Utilizing Switching Electroosmotic Flow.", Analytical Chemistry,vol.76,No.18,2004,pp.5265-5272. 3.M.Z. Huang, R.J. Yang, C.H. Tai, C.H Tsai, L.M. Fu, "Application of electrokinetic instability flow for enhanced micromixing in cross-shaped microchannel.", Biomedical microdevices vol.8,2006,pp.309-315. 4.Z. Wu, and D. Li, "Mixing Enhancement By Induced-Charge Electrokinetic Flow.", Micro/Nanoscale Heat Transfer International Conference, vol.29.part A,2008,pp.53-61. 5.Q.Liao, T.Y.Wen, X.Zhu, "Thermal Effect on Electro-osmotic Flows in Triangle Microchannels." Micro/Nanoscale Heat Transfer International Conference, vol.29.part A, 2008, pp.147-153. 6.H.Y. Wu, and C.H. Liu, "A novel electrokinetic micromixer.", Sensors and Actuators,vol.118(1),2005,pp.107-115. 7.N.G.Green,A.Ramos,A.Gonzalez,H.Morgon ,A Castaleanos ,"Fluid flow induced by nonuniform ac electric fields in electrolytes on microelectrodes. Observation of streamlines and numerical simulation.", Physical Society,vol.66, 2002, 026305. 8.J. Wu, Y. Ben, D. Battigelli. H.C. Chang, "Long-Range AC Electroosmotic Trapping and Detection of Bioparticles.", Chemical Society,Vol.44,No.8 ,2005,pp.2815-2822. 9.P.Garcia-Sanchez, A. Ramos, N.G.Green, H.Morgan, "Experiments on AC Electrokinetic Pumping of Liquids Using Arrays of Microelectrodes.", IEEE Transactions on Dielectrics and Electrical Insulation, Vol.13,No.3,2006, pp.670-677. 10.S.H. Huang, S.K. Wang, H.S. Khoo, F.G. Tzeng, "AC electroosmotic generated in-plane microvortices for stationary or continues fluid mixing.", Science Direct, vol.125, No.1,2007,pp.326-336. 11.A.B.D.Brown, C.G.Smith, A.R.Rennie ,"Pumping of water with ac electric fields applied to asymmetric pairs of microelectrodes.", Physical Society, vol.63,2000,016305. 12.B.D Iverson, S.V Garimella, "Recent advances in microscale pumping technologies:a review and evaluation.", Microfluid and Nanofluid, vol.5,2008,pp.145-174. 13.陳志銘,"週期性電場與壓力場聯合引發微流動的特性研究." 國立中興大學,機械工程系研究所碩士論文,2003. 14.黃經孝, "微管道電滲流物理特性之研究." 國立中央大學,機械工程系研究所碩士論文,2004. 15.黃柏丞,"幾何形狀對微混合現象影響之研究." 國立交通大學,機械工程系研究所碩士論文,2005. 16.黃家輝,"電滲微邦浦驅動系統之研究." 國立海洋大學,輪機工程系研究所碩士論文,2005. 17.李俊寬,"具週期性電場與表面電位變化偶合效應之微流混合數值研究." 逢甲大學,航太與系統工程學系碩士論文,2005. 18.彭育傑,"週期性電場與壓力梯度趨動之微流道混合特性的數值分析-曲率之影響." 國立中興大學,機械工程系研究所碩士論文,2007.
本研究係採用數值模擬方式,探討在三維矩形管內鋪設不對稱電極驅動流體特性的影響參數。本研究的工作流體為去離子水(DI-water),各變化參數如下:大、小電極的長度比(k)、驅動頻率(f)、上、下電極水平距離(p)、高寬比(H/W)與前後組電極水平距離(M)。 研究結果顯示:利用不對稱電極施予外加電場產生漩渦結構驅動電極上方的流體,可以產生流體單一方向的流動,其中大電極上方的漩渦為驅動流體的主要機制。單邊裝設電極時當低頻驅動且k值(5~7)與高寬比(H/W=1/2)可使漩渦得到適當的發展。在雙邊裝設電極時,上、下電極相對距離(p/R=0)會增加驅動流量。利用多組電極串聯驅動時,當前、後組電極間距為M/R=1可進一步提升流量。

This study investigates the flow field driven by asymmetric electrodes in a three dimensional micro-channel by numerical simulation with De-ion water as the electrolyte. The parameters studied are: size ratio(k)of the large and the small electrodes,driving frequency(f),the horizontal staggered distance(p) between the top and the bottom electrodes,aspect ratio(H/W) and the longitudinal distance(M) between two successive cells. The results show: For asymmetric electrodes residing only on one channel wall,a uni-direction flow can be generated by asymmetric electrodes. The vortices above the large electrodes are the main source for pumping the electrolyte. The vortical structures are well developed while suitable size ratio (k=5~7)and aspect ratio(H/W=1/2)are select. Besides,the pumping performance is better driven at low frequency than at high frequency. When a pair of electrode are installed on the both top and bottom walls,zero horizontal distance between the staggered electrodes(p/R=0)can increase the pumping flow rate. If the pumping flow rate is required to increase,successive cells with longitudinal space(M/R=1)would gain better pumping performance.
其他識別: U0005-1008200920563400
Appears in Collections:機械工程學系所

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