微流道中液滴成形及滴落現象之模擬分析

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陳科翔(Ke-Siang Chen) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

微流道中液滴成形及滴落現象之模擬分析

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摘要(中)

本文探討兩種不互溶流體在微流道中液滴生成和液體從晶片出口處滴
落情形，藉由ANSYS FLUENT 模擬軟件模擬兩相流體在二維T型微流道流動狀態，在不考慮兩相流體界面間的化學反應條件下，觀察兩相流體在不同體積流率和不同流道內壁面接觸角在T 型流道流動情形，以及氣體和液體在流道分段流動而液體從晶片出口處滴落時，觀察是否會被不同的流道內壁面接觸角和晶片外壁面接觸角所影響液體滴落情形。
以五種不同的流體體積流率和四種不同的流道內壁面接觸角探討液體
被氣體截斷時，氣體和液體在流道流動區塊是否獨立，以及氣體和液體在流道中各自所佔的區塊大小和流動形態關係。並探討流道內壁面接觸角和晶片外壁面接觸角對液體從晶片出口處滴落所造成的影響。
本文顯示空氣和水在T 型流道中相互擠壓及拉伸產生各自獨立區塊，
而隨著時間增加下空氣和水會重複性得到固定的獨立區塊。在兩相體積流率比為5 時，因為不同的流道內壁面接觸角所造成空氣和水在流道中形態的變化，有些流道內壁面接觸角會造成空氣和水各自獨立區塊無法產生。而液體從晶片出口處滴落的情形本文探討四種內壁面接觸角和三種外壁面接觸角對水從晶片出口處滴落的情形，得知晶片外壁面接觸角對水從晶片出口處的滴落影響會遠大於內壁面接觸角的影響。

摘要(英)

This article discussed two immiscible fluids in microchannel droplet formation and fluid dripping case from the chip outlet, by ANSYS FLUENT software simulation of two-phase fluid in a two dimensional T-junction microchannel flow state. Without considering the chemical reaction at the interface between two phase fluids, observe the two phase fluid contact angle at different volume flow rates and different inner wall contact angle fluid flow case
in the T-junction microchannel. The gas and liquid segmented flow in the T-junction microchannel and liquid dripping case from the chip outlet, observe whether it will be a different inner wall contact angle and chip surface contact angle of liquid dripping affected situations.
Using five different volume flow rates and four different inner wall contact angle discussed the gas cut off liquid generate respective block whether independent and block size with the flow pattern of relationship. The inner wall
contact angle and the chip surface contact angle is discussed dripping case from the chip outlet caused.
This article pointed out that water and air mutual push generate respective independent block in T-junction microchannel and fixed block of time to increase. In the two-phase volume flow rate ratio is five, because the different inner wall contact angle caused by the change of air and water in the form of flow, some inner wall contact angle will cause the air and water separate block can’t produce. While the fluid dripping case from the chip outlet this article discussed four inner wall surface contact angle and three kinds of chip surface contact angle of water dripping case from the chip outlet, that the chip surface contact angle of water influence from chip outlet dripping will affect more than the inner wall surface contact angle.

關鍵字(中)

★ 計算流體力學
★ 兩相流
★ 微流體

關鍵字(英)

★ Computational fluid dynamics
★ Two-phase flow
★ Microfluidics

論文目次

摘要 ................................................ i
Abstract ............................................ ii
致謝 ................................................ iv
目錄 ................................................ v
圖目錄 .............................................. viii
表目錄 .............................................. x
符號說明 ............................................ xi
英文字母 .......................................... xi
希臘字母 ............................................ xii
第一章緒論 ......................................... 1
1.1 前言 ............................................ 1
1.2 文獻回顧 ........................................ 2
1.2.1 液-液相微液滴系統文獻回顧 ..................... 3
1.2.2 氣-液相微液滴系統文獻回顧 ..................... 7
1.2.3 液體滴落文獻回顧 .............................. 9
1.3 研究動機與目的 .................................. 11
1.4 論文架構 ........................................ 12
第二章數值方法 ..................................... 14
2.1 計算流體力學簡介 ................................ 14
2.2 ANSYS FLUENT 模擬軟體介紹 ....................... 15
2.3 幾何模型與基本假設 .............................. 16
2.4 統御方程式介紹 .................................. 18
2.5 VOF 模組介紹 .................................... 19
2.5.1 The Volume Fraction Equation .................. 20
2.6 CSF 模組介紹 .................................... 20
2.7 數值方法 ........................................ 22
2.7.1 壓力與速度求解方法 ............................ 22
2.7.2PISO 演算法 .................................... 23
2.8 毛細數(Capillary number,Ca) ..................... 24
第三章數值模擬計算 ................................. 25
3.1 幾何尺寸與邊界設定 .............................. 25
3.2 計算方法 ........................................ 28
3.3 網格獨立性分析 .................................. 30
第四章結果與討論 ................................... 34
4.1 液滴成形過程 .................................... 34
4.1.1 兩相進口流率比影響 ............................ 36
4.1.2 內壁面接觸角影響 .............................. 39
4.2 液體滴落過程 .................................... 43
4.2.1 內壁面接觸角影響 .............................. 44
4.2.2 外壁面接觸角影響 .............................. 49
第五章結論與未來展望 ............................... 56
5.1 結論 .............................................56
5.2 未來展望 ........................................ 59
參考文獻 ............................................ 60
附錄 ................................................ 67

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指導教授

曹嘉文(Chia-Wen Tsao)

審核日期

2013-8-23

推文