微流道中以旅波介電泳方式驅動的二相懸浮流

Abstract

在本文研究中，吾人利用及修改孫志璿(2004)所撰寫的程式，研究以旅波式介電電泳來驅動全血中的紅血球運動，進而帶動血漿前進。本文中主要的研究工作分為三個部份:ㄧ、對於運算程式作詳細的格點測試，本文的最適當格點系統為取時間格點 ，電場格點0.5μm，源項控制體積大小為 及流場格點間距取2μm作為運算。二、討論當微流道長度增加時，管長阻力對於吾人計算中以介電電泳驅動血球運動的影響有多大。以及探討不同電極設計對於以旅波式介電電泳來驅動血球運動的效用，計算發現當流道中電極設計為上下壁各一組電極作用時，計算後的平均流速值可以達到4145μm/sec，而以兩組電極並排驅動的效應則為4737μm/sec，故若是以此兩種電極搭配的方式作為電極設計，則必可以達到更大效用。三、探討當微流道中導電度和介電係數隨著血球所在位置產生變化時的二項耦合效應結果顯示，其出口耦合流速值達到2642μm/sec，跟先前不考慮空間介電特性的電場計算出來的平均流速1869μm/sec比較，前者具有較佳的效果。

In the study, I drive the two phase suspension flow with the traveling-wave dielectrophoresis. There are three parts in my study. First, it’s about the condition of grid dependence test. The best grid system is time grid , electric field grid 0.5μm, controlling volume from the source term ,and the distance between grid of the flow field . Second, how serious does dielectrophoresis drive the particle because of influence from drag, when the length increases? The other topic is the effect from dielectrophoresis driving the particle caused by different design of electric poles. I found that the poles put in upside wall and down wall may result to the average velocity, 4145μm/sec. And when putting in parallel, the average velocity could reach 4737μm/sec. If combing the two design, it will be better. The final part is about the result of the two way coupling when the conductivity and the permittivity change. And the result is that the coupling outlet average velocity, 2642μm/sec, compare with the result when considering the permittivity and the conductivity in the channel space are constant. The former will be better.