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研究生:林洸銓
論文名稱:主動式與被動式微混合器之最適化設計
論文名稱(外文):Adaptive Design of Active and Passive Micromixers
指導教授:陳理定楊鏡堂楊鏡堂引用關係
學位類別:碩士
校院名稱:國立清華大學
系所名稱:動力機械工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:88
中文關鍵詞:生物晶片微混合器
相關次數:
  • 被引用被引用:6
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  • 下載下載:57
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本文以數值流力與實驗觀測探討生物晶片的微混合器設計,針對微混合器系統的微幫浦與主流道兩個次元件探討,分別設計產生混合的方法。微幫浦設計上採用主動式脈衝驅動流體達到混合,在兩個流道入口以相位差180o造成兩股流體之間的最大動量差,並且以週期性的交錯來提升兩股流體的混合效率。在主流道的設計上採用被動式蜿蜒形結構增強法,放置交錯排列的十個擋體於主流道的兩側,使得主流道有擴張與收縮的效應來增強混合效率。數值的計算部份,則以SIMPLEC模式法求解,針對兩個不同的混合增強方式設計不同的邊界條件與初始條件,並分析流線場與濃度場。脈衝流混合增強法的研究參數為雷諾數Re與史卓荷數St,蜿蜒形結構混合增強法的研究參數為雷諾數Re與流道擴張收縮比A/R。研究結果顯示脈衝流在低雷諾數會產生動量不足,太高的雷諾數會使得流體混合時間太短。史卓荷數在St=12.6可得到較好的混合結果。在被動式蜿蜒形結構的分析上顯示,當流道的擴張與收縮比A/R=0.25可增加微混合器的使用範圍,兩股流體的介面因為拉長,使得流體的混合在較低的雷諾數Re=3仍然由擴散來主導,在較高的雷諾數Re=30,則藉由迴流區的增長使得對流的效應主導混合。在A/R=0.25∼0.5的範圍,流體的混合效果隨著雷諾數變大而增加,在A/R=0.75∼1的範圍,流體的混合效果隨著雷諾數變大而減低。
摘 要 1
目 錄 2
圖 表 目 錄 5
符 號 說 明 9
第一章 緒 論 11
1-1 前言 11
1-2 研究動機與目的 12
第二章 文 獻 回 顧 14
2-1 微混合器分類 14
2-2 被動式混合器探討 16
2-2.1 叉形微混合器 16
2-2.2 側向形微混合器 17
2-2.3 T型微混合器 17
2-2.4 蜿蜒形微混合器 19
2-2.5交錯鯡骨式微混合器 20
2-3 主動式混合器探討 22
2-3.1 方波脈衝微幫浦 22
2-3.2 正弦波脈衝微幫浦 23
2-4 混合指數 23
2-4.1 利用酸鹼指示劑判斷 23
2-4.2 利用有色染料判斷 23
第三章 理 論 分 析 24
3.1 物理模型 25
3-1.1 蜿蜒型混合器 25
3-1.2脈衝幫浦混合器 26
3-2 基本假設 26
3-3 系統方程式及起始╱邊界條件 27
3-4 統御方程式及起始╱邊界條件無因次化 30
3-5 混合效率檢測 33
第四章 數 值 方 法 34
4-1控制體積法 34
4-1.1 統御方程式離散化 34
4-1.2 有限差分方程式 37
4-2 SIMPLEC 數值方法 38
4-3 低鬆弛係數(under-relaxation) 39
第五章 結 果 與 討 論 40
5-1數值評估 40
5-1.1網格產生 40
5-1.2脈衝微幫浦之時間點監控與網格獨立測試 41
5-1.3蜿蜒型混合器之網格獨立測試 43
5-2 T型混合器 44
5-3主動式脈衝微幫浦混合增強 48
5-3.1脈衝流場對混合增強之影響 50
5-3.2雷諾數Re之影響 56
5-3.3 史卓荷數St之影響 66
5-4被動式結構蜿蜒型混合增強 75
5-4.1 蜿蜒型主流道擴張與收縮之影響 76
5-4.1雷諾數Re之影響 82
第六章 綜 合 結 果 與 未 來 展 望 93
第七章 參 考 文 獻 95
第七章 參 考 文 獻
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