研究生: |
林子傑 |
---|---|
論文名稱: |
運用微視流技術觀測壓電噴墨噴覆特性之研究 Study on the Characteristics of Inkjet Droplet Deposition Using Micro Flow Visualization Technique |
指導教授: | 劉通敏 |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 動力機械工程學系 Department of Power Mechanical Engineering |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 119 |
中文關鍵詞: | 噴覆 、凹槽 |
相關次數: | 點閱:2 下載:0 |
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本文主要以微視流(μ-FV)技術觀測微尺度下壓電式噴墨頭之外流場,從液滴生成、演化、飛行、噴覆於矽晶凹槽等過程直至穩態成型,其中矽晶凹槽噴覆實驗就作者所知未曾見於先前文獻報導。本實驗利用調變電壓來達到液滴噴覆速度的改變,電壓變化範圍為16~31V,噴覆速度的變化範圍為6.2~7.0 m/s,液滴直徑為23μm,操作頻率為10 kHz,雷諾數的變化範圍為46.1~106.9,韋伯數則為14.3~34.1。為了更加符合工業上的製程(例如:彩色濾光片、平面顯示器等)應用,本實驗設計一個矽晶凹槽(長:49μm、寬:49μm、高:75μm)陣列來作為噴覆的基板,其底部為矽晶片,邊界為SU-8﹔所選用的工作流體包括商用墨水(文書列印)、生物試劑(生醫檢測)、Peo(印刷塗層) 、Pedot(平面顯示器)等不同應用之溶液,這些工作流體與矽晶片及SU-8邊界均為親水性質,接觸角的範圍分別為35°∼54°、15°∼75°。本實驗所變化之參數包括:噴覆速度、黏滯係數、表面張力、流體與邊界之接觸角,探討這些參數對噴覆穩態後的成型影響,並闡述其中相關之物理機制,俾找出可區分其不同噴覆特性之臨界值。經由本實驗的設計,不但可以使液滴準確地噴覆於凹槽中,而且針對現階段所採用之工作流體範圍,本實驗發現三種噴覆穩態後的成型(蒙古包狀近似圓、中空近似圓、液膜填滿整個凹槽),並以慣性力的量值(1.67×106、1.90×106)作為其區分特性之依據,再搭配數值模擬互相比較相符程度。在沒有SU-8邊界存在時,本實驗結果與前人在平板的研究結果類似;一旦邊界效應存在時,液膜在延展過程中受到SU-8親水性的影響,液膜只能藉由反彈的機制來達到填滿凹槽的目的,此時噴覆速度(慣性力)的大小就顯得相當重要,而本實驗也發現兩個臨界速度範圍(6.6 m/s、6.9~7.0 m/s)。值得一提的是表面張力扮演一個吸附流體聚集在SU-8邊界周圍的角色,與在平板時所扮演回縮的角色是完全截然不同的。然而流體與邊界的接觸角對穩態後的成型也相當重要,接觸角越小,彼此間的親水性越強,液膜更難填滿整個凹槽,然而在初始條件都固定的情況下,在工業製程上亦可適當地調整接觸角來達到填滿的目的。
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