臺灣博碩士論文加值系統

近年來環保意識日漸高漲，任何可能造成環境污染的事件，都會被特別的關注。其中以海洋污染造成的影響最大，從漁船排放出的油汙可說是造成海洋污染最主要的原因，故須於船舶上設置油水分離器分離油水再予以排放以符合國際公約規定。本文以計算流體力學的方式，藉由應用分析軟體，模擬適用於小型漁船用之旋流式油水分離器進行數值研究。計算出其流場及分離效率等相關資訊，並以標準型(standard) 及圓錐型(conical)旋流器為實際案例進行探討。
其中模擬速度流場之數值方法，是使用適合於渦流之雷諾應力模式(Reynold Stress Model﹐RSM)，針對旋流器不同高度之橫切面作速度流場分析；也利用DPM分散相模式法(Discrete Phase Models)去分析不同外型旋流器之分離效率與影響因素，由研究結果得知具圓錐漸縮腔之旋流器分離效果較好，時間也較快；兩相流體若於入口較接近軸心處進入旋流器則較容易被分離。故本研究目地是期望能得到有助於改善油水分離器分離效率相關訊息，並對往後設計新式油水分離器有所幫助。

The environmental consciousness ran high day by day during these years, any may cause the incident of the environmental pollution will be concerned specially. The ones that cause with the marine pollution among them are the most influential; the oil wastewater discharged must be regulated. In order to comply with this purpose, we can set up the oil-water separator on the shipping boat to reduce the ocean pollute. This study utilizes the FLUENT software to simulate the flow field within the hydro-cyclone. We expect that using this evaluation, we can obtain the separation efficient for subsequent reference for the design of flow fields. In this study, the Reynolds Stress Model (RSM) has been applied in the numerical method to predict the velocity fields of flow motion on the two different type hydro-cyclones.
We also use Discrete Phase Models (DPM) to calculate the separation efficient on those different type hydro-cyclones. The numerical results show that the device with conical part will have better performance than which without having it. The multi-phase fluid is much easier to be separated when the inlet flow is more close to the axis of hydro-cyclone.

目錄
中文摘要 ..................................................i
目錄......................................................ii
表目錄.....................................................v
圖目錄....................................................vi
符號說明...................................................x

第一章 緒論................................................1
1-1 前言...................................................1
1-2 研究目的 ..............................................3
1-3 文獻回顧 ..............................................4

第二章 數學統御方程式 .....................................8
2-1 基本假設...............................................8
2-2 統御方程式.............................................8
2-3 紊流模式 ..............................................9
2-4 RSM紊流模式...........................................10
2-5 DPM分散相模式法.......................................11

第三章 數值方法及物理模型 ................................15
3-1 FLUENT基本架構與簡介..................................15
3-2 交錯式網格點系統......................................16
3-3 離散化方法............................................17
3-4 物理模型…............................................19
3-5 邊界條件..............................................20
3-6 壓力速度耦合關係的處理................................20

第四章 結果與討論 ........................................25
4-1 模式驗證…............................................25
4-2 標準型旋流器模擬結果與文獻驗證........................26
4-3 純圓錐型旋流器........................................27
4-3-1 橫切面之軸向及切線速度..............................27
4-3-2 橫切面向量圖........................................28
4-3-3 縱切面(Y=0)流場計算結果.............................29

4-4 DPM模式..............................................31
4-4-1油滴顆粒於標準型旋流器內部流場的軌跡追蹤.............31
4-4-2油滴顆粒於圓錐型旋流器內部流場的軌跡追蹤.............33
4-4-3顆粒入口位置對分離效率的分析.........................35
4-4-4分離效率.............................................36

第五章 結論與未來展望 ....................................38
5-1 結論..................................................38
5-2 未來展望..............................................39
參考文獻 .................................................40
附表 .....................................................42
附圖......................................................43

參考文獻
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