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研究生:林吳尊明
研究生(外文):Tsun-Ming Lin Wu
論文名稱:反向三角形密封盒內熱質自然對流現象研究
論文名稱(外文):The Study of Thermosolutal Convection in a Reverse Triangle Enclosure
指導教授:王立文王立文引用關係
指導教授(外文):Lin-Wen Wang
學位類別:碩士
校院名稱:元智大學
系所名稱: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:2009
畢業學年度:97
語文別:中文
論文頁數:153
中文關鍵詞:三角形熱質自然對流
外文關鍵詞:Triangle EnclosureThermosolutal Convection
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本研究是利用實驗的方法來探討幾何形狀反向三角形密閉盒,由溫度梯度與濃度梯度所引起之熱質自然對流現象。並且改變其邊界條件之設計,使得在實驗中可觀察到,不同邊界條件之反向三角形空間對於流場型態之影響。並且針對不同流場型態,量測溫度與濃度分佈,近而了解流場結構。並對於質傳遞率Sh值與Grm,Grt之關係作分析。
實驗工作流體為濃度0.05 M的硫酸銅水溶液(CuSO4+H2SO4+H2O)。
溫度梯度是由兩個不同溫度的恆溫水槽來維持。濃度梯度則利用電化學系統來建立,既利用電解方式在壁面造成不同濃度的擴散邊界層。流場觀察是利用雷射光暗影法(shadowgraph),並且以相機拍照紀錄。
本研究中發現,Sh值隨著Grt的增加而增加。在整理後發現水平壁決定了流場形態、溫度與濃度分佈,且當水平壁為絕緣時可觀察到堆積的流體會發生被帶離的現象。
The purpose of the study is to investigate flow patterns, temperature and concentration distributions resulting from buoyancy force due to a combination of temperature and species convection effects in a reverse triangle enclosure.
In this experiment, the temperature and the concentration differences are made between the two walls of three walls in the triangle enclosure. Cupric Sulphate solution is selected as the working fluid. Two constant temperature baths keep the temperature gradient. The concentration gradient is controlled via electrochemical system. The temperature and concentration gradients are imposed in such a way that their effects on the flow were either cooperating or opposing.
In order to visualize the flow, the shadowgraph technique is used. Electrical measurements will be used to obtain mass transfer rates and to infer a Sherwood number.
To understand the flow structure, the temperature distribution and concentration distribution are investigated. Finally, the correlations between Sherwood number and solutal concentration Grashof number and thermal Grashof number are also needed to be analyzed.
In this experiment, the Sh value increases with the Grt increase. After the rearrangement, we are found that the horizontal wall decides the flow structure, the temperature and the concentration distribution. But when the horizontal wall is insulated the stack flow can be observed and it will cause a phenomenon of being brought to leave.
書面頁 i
論文口試委員審定書 ii
授權書 iii
中文摘要 iv
英文摘要 v
誌謝 vi
目錄 vii
圖目錄 xi
符號說明 xv
一、 前言 1
二、 實驗設計與方法 6
2.1. 溫度梯度的建立 6
2.2. 濃度梯度的建立 6
2.3. 實驗裝置 8
2.4. 實驗過程 9
2.5. 流場觀察 10
2.5.1. 雷射光暗影法 10
2.5.2. 溫度的量測 11
2.5.3. 濃度的量測 11
三、 實驗結果與討論 12
3.1. 流場整體結構 12
3.2. 雷射光暗影法之流場濃度型態分析 13
3.2.1. 右壁加熱、上壁冷卻 14
(1) Case1-1順向流場 14
(2) Case1-2逆向流場 14
3.2.2. 左壁加熱、上壁冷卻 15
(1) Case2-1 順向流場 15
(2) Case2-2 逆向流場 16
3.2.3. 右壁加熱、左壁冷卻 17
(1) Case3-1順向流場 17
(2) Case3-2逆向流場 18
3.2.4. 左壁加熱、右壁冷卻 19
(1) Case4-1順向流場 19
(2) Case4-2逆向流場 20
3.2.5. 上壁加熱、右壁冷卻 21
(1) Case5-1順向流場 21
(2) Case5-2逆向流場 22
3.2.6. 上壁加熱、左壁冷卻 22
(1) Case6-1順向流場 22
(2) Case6-2逆向流場 23
3.2.7. θ=225°,右壁加熱、上壁冷卻 24
(1) Case7-1順向流場 24
(2) Case7-2逆向流場 24
3.2.8. θ=225°,左壁加熱、右壁冷卻 25
(1) Case8-1順向流場 25
(2) Case8-2逆向流場 26
3.2.9. θ=225°,上壁加熱、右壁冷卻 27
(1) Case9-1順向流場 27
(2) Case9-2逆向流場 28
3.3. 流場溫度分佈 28
3.3.1. 右壁加熱、上壁冷卻 29
(1) Case1-1順向流場 29
(2) Case1-2逆向流場 29
3.3.2. 左壁加熱、上壁冷卻 29
(1) Case2-1順向流場 29
(2) Case2-2逆向流場 30
3.3.3. 右壁加熱、左壁冷卻 30
(1) Case3-1順向流場 30
(2) Case3-2逆向流場 31
3.3.4. 左壁加熱、右壁冷卻 31
(1) Case4-1順向流場 31
(2) Case4-2逆向流場 31
3.3.5. 上壁加熱、右壁冷卻 32
(1) Case5-1順向流場 32
(2) Case5-2逆向流場 32
3.3.6. 上壁加熱、左壁冷卻 32
(1) Case6-1順向流場 32
(2) Case6-2逆向流場 33
3.3.7. θ=225°,右壁加熱、上壁冷卻 33
(1) Case7-1順向流場 33
(2) Case7-2逆向流場 34
3.3.8. θ=225°,左壁加熱、右壁冷卻 34
(1) Case8-1順向流場 34
(2) Case8-2逆向流場 34
3.3.9. θ=225°,上壁加熱、右壁冷卻 34
(1) Case9-1順向流場 34
(2) Case9-2逆向流場 35
3.4. 流場濃度分佈 35
3.4.1. 右壁加熱、上壁冷卻 35
(1) Case1-1順向流場 35
(2) Case1-2逆向流場 35
3.4.2. 左壁加熱、上壁冷卻 36
(1) Case2-1順向流場 36
(2) Case2-2逆向流場 36
3.4.3. 右壁加熱、左壁冷卻 37
(1) Case3-1順向流場 37
(2) Case3-2逆向流場 37
3.4.4. 左壁加熱、右壁冷卻 38
(1) Case4-1順向流場 38
(2) Case4-2逆向流場 38
3.4.5. 上壁加熱、右壁冷卻 38
(1) Case5-1順向流場 38
(2) Case5-2逆向流場 39
3.4.6. 上壁加熱、左壁冷卻 39
(1) Case6-1順向流場 39
(2) Case6-2逆向流場 40
3.4.7. θ=225°,右壁加熱、上壁冷卻 40
(1) Case7-1順向流場 40
(2) Case7-2逆向流場 40
3.4.8. θ=225°,左壁加熱、右壁冷卻 41
(1) Case8-1順向流場 41
(2) Case8-2逆向流場 41
3.4.9. θ=225°,上壁加熱、右壁冷卻 41
(1) Case9-1順向流場 41
(2) Case9-2逆向流場 42
3.5. 無因次質傳遞率Sh值分析 42
3.5.1. Sh與熱質順向、逆向之關係 43
3.5.2. Sh與Grt之關係 43
四、 結論 44
4.1. 流場形態分佈 44
4.1.1. 水平壁冷卻 44
4.1.2. 水平壁絕緣 44
4.1.3. 水平壁加熱 45
4.2. 流場溫度分佈 45
4.2.1. 水平壁冷卻 45
4.2.2. 水平壁絕緣 45
4.2.3. 水平壁加熱 46
4.3. 流場濃度分佈 46
4.3.1. 水平壁冷卻 46
4.3.2. 水平壁絕緣 47
4.3.3. 水平壁加熱 47
4.4. 無因次質傳遞率 47
4.4.1. 相同Grt時Sh之比較 47
4.4.2. 相同Grm時Sh之比較 48
4.5. 相同Grt、Grm時與陳意欣【20】三角形封閉盒內熱質自然對研究比較 48
參考文獻 49
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13.H. Asan, L. Namli, "Laminar Natural Convection in a Pitched Roof of Triangular Cross-Section: Summer Day Boundary Conditions", Energy and Buildings, Vol.33, pp.69-73, 2000.
14.H. Asan, L. Namli, "Numerical Simulation of Buoyant Flow in a Roof of Triangular Cross-Section under Winter Day Boundary Conditions", Energy and Buildings, Vol.33, pp.753-757, 2001.
15.Tanmay Basak, S. Roy, Ch.Thirumalesha, "Finite Element Analysis of Natural Convection in a Triangular Enclosure: Effects of Various Thermal Boundary Conditions", Chemical Engineering Science, Vol.62, pp.2623-2640, 2007.
16.Hakan F. Oztop, Yasin Varol, Ahmet Koca, "Laminar Natural Convection Heat Transfer in a Shed Roof with or without Eave for Summer Season", Applied Thermal Engineering, Vol.27, pp.2252-2265, 2007.
17.Yasin Varol, Ahmet Koca, Hakan F. Oztop, "Natural Convection in a Triangle Enclosure with Flush Mounted Heater on the Wall", Int. Communications in Heat and Mass Transfer, Vol.33, pp.951-958, 2006.
18.Ahmet Koca, Hakan F. Oztop, Yasin Varol, "The Effects of Prandtl number on Natural Convection in Triangular Enclosures with Localized Heating from Below", Int. communications in Heat and Mass Transfer, Vol.34, pp.511-519, 2007.
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20.陳意欣,,「三角形封閉盒內熱質自然對流研究」,元智大學,碩士論文,民國九十八年。
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