跳到主要內容

臺灣博碩士論文加值系統

(3.236.28.137) 您好!臺灣時間:2021/07/25 21:07
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:許智豪
研究生(外文):Chih-Hao Hsu
論文名稱:具高展弦比矩形阻礙物之封閉盒內熱質自然對流
論文名稱(外文):Thermosolutal Convection in an Enclosure with a High Aspect Ratio Block
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:145
中文關鍵詞:熱質自然對流阻礙物
外文關鍵詞:Thermosolutal conventionBlock
相關次數:
  • 被引用被引用:1
  • 點閱點閱:111
  • 評分評分:
  • 下載下載:1
  • 收藏至我的研究室書目清單書目收藏:0
本研究探討高展弦比矩形阻礙物於矩形盒中不同位置之流場型態及溫度、濃度現象分析。工作溶液為硫酸銅水溶液(CuS04+H2SO4+H2O) 濃度0.05M,溫度梯度由兩個不同溫度的恆溫水槽來維持而濃度梯度使用電化學方法造成,亦即利用電解方法在兩銅板附近形成不同濃度之邊界層。
盒內流場現象採用雷射光暗影法(shadowgraphy)觀察流場,並以相機拍照記錄。針對相關無因次參數來探討密閉區域內的流場結構,
為了瞭解流場結構,對流場的溫度及濃度分佈作測量,最後將於質傳遞率Sh值與Grm、Grt之關係做分析。實驗結果顯示,其阻礙物位置不同將呈現不同的流場。其上層與下層會隨時間增加而增厚,而增加的速率與浮力比成正比。
The purpose of present study is to investigate flow pattern, temperature and concentration distributions resulting from buoyancy force due to a combination of temperature and species convection effects in an enclosure with a high aspect ratio bock. To change the block location is main objective in this study.
The working solution used is aqueous copper sulphate concentration is 0.05mole. An electrochemical method based on a diffusion-controlled electrode reaction will be employed in this work for creating the concentration gradient.The temperature is maintained uniform and controlled by two separated constant temperature baths, which circulate heated or cooled water through the heat exchanger. To visualize the flow, the shadowgraph technique is used.
To understand the flow structure, the temperature distribution and concentration distribution are investigated. Finally, the correlations between Sherwood number and solutal Grashof number and thermal Grashof number are also needed to be analyzed.
The experiment results shows that the different location of block will cause the different flow structure. The both thickness of upper and lower layers will increase with time and the increasing rate is positive by buoyancy ratio .
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
致謝 vi
目錄 vii
圖目錄 xiv
符號說明 xx
一、 前言 1
二、 實驗設計與方法 5
2.1. 溫度梯度的建立 5
2.2. 濃度梯度的建立 5
2.3. 實驗裝置 7
2.4. 實驗過程 8
2.5. 流場觀察 9
2.5.1. 雷射光暗影法 9
2.5.2. 溫度量測 9
2.5.3. 濃度量測 10
三、 實驗結果與討論 11
3.1. 流場整體結構 11
3.2. 雷射光暗影法之流場型態分析 12
3.3. 阻礙物Case分類說明: 12
3.4. 雷射光暗影法之流場型態分析 13
3.4.1. 阻礙物於上方、左側,D1*=D2*=0.125 13
(1) Case1-1-1順向流場 13
(2) Case2-1-1逆向流場 14
3.4.2. 阻礙物於中間、左側,D1*=0.25、D2* =0.125 15
(1) Case1-2-1順向流場 15
(2) Case2-2-1逆向流場 15
3.4.3. 阻礙物於下方、左側,D1*=0.375、D2* =0.125 16
(1) Case1-3-1順向流場 16
(2) Case2-3-1逆向流場 17
3.4.4. 阻礙物於上方、中間,D1*=0.125、D2* =0.375 18
(1) Case1-1-2 順向流場 18
(2) Case2-1-2 逆向流場 19
3.4.5. 阻礙物置中,D1*=0.25、D2* =0.375 20
(1) Case1-2-2 順向流場 20
(2) Case2-2-2 逆向流場 20
3.4.6. 阻礙物於下方、中間,D1*=D2* =0.375 21
(1) Case1-3-2 順向流場 21
(2) Case2-3-2逆向流場 21
3.4.7. 阻礙物於上方、右側,D1*=0.125、D2* =0.625 22
(1) Case1-1-3 順向流場 22
(2) Case2-1-3 逆向流場 23
3.4.8. 阻礙物於中間、右側,D1*=0.25、D2* =0.625 23
(1) Case1-2-3 順向流場 23
(2) Case2-2-3 逆向流場 24
3.4.9. 阻礙物於下方、右側,D1*=0.375、D2* =0.625 25
(1) Case1-3-3 順向流場 25
(2) Case2-3-3逆向流場 26
3.5. 流場溫度分佈 26
3.5.1. 阻礙物於上方、左側,D1*=D2*=0.125 27
(1) Case1-1-1順向流場 27
(2) Case2-1-1逆向流場 27
3.5.2. 阻礙物於中間、左側,D1*=0.25,D2*=0.125 28
(1) Case1-2-1順向流場 28
(2) Case2-2-1逆向流場 28
3.5.3. 阻礙物於下方、左側,D1*=0.375,D2*=0.125 29
(1) Case1-3-1順向流場 29
(2) Case2-3-1逆向流場 29
3.5.4. 阻礙物於上方、中間,D1*=0.125,D2*=0.375 30
(1) Case1-1-2順向流場 30
(2) Case2-1-2逆向流場 30
3.5.5. 阻礙物置中,D1*=0.25,D2*=0.375 31
(1) Case1-2-2順向流場 31
(2) Case2-2-2逆向流場 31
3.5.6. 阻礙物於下方、中間,D1*=D2*=0.375 32
(1) Case1-3-2順向流場 32
(2) Case2-3-2逆向流場 32
3.5.7. 阻礙物於上方、右側,D1*=0.125,D2*=0.625 32
(1) Case1-1-3順向流場 32
(2) Case2-1-3逆向流場 33
3.5.8. 阻礙物於中間、右側,D1*=0.25,D2*=0.625 33
(1) Case1-2-3順向流場 33
(2) Case2-2-3逆向流場 34
3.5.9. 阻礙物於下方、右側,D1*=0.375,D2*=0.625 34
(1) Case1-3-3順向流場 34
(2) Case2-3-3逆向流場 34
3.6. 流場濃度分佈 35
3.6.1. 阻礙物於上方、左側,D1*=D2*=0.125 35
(1) Case1-1-1順向流場 35
(2) Case2-1-1順向流場 35
3.6.2. 阻礙物於中間、左側,D1*=0.25,D2*=0.125 36
(1) Case1-2-1順向流場 36
(2) Case2-2-1逆向流場 36
3.6.3. 阻礙物於下方、左側,D1*=0.375,D2*=0.125 37
(1) Case1-3-1順向流場 37
(2) Case2-3-1逆向流場 37
3.6.4. 阻礙物於上方、中間,D1*=0.125,D2*=0.375 37
(1) Case1-1-2順向流場 37
(2) Case2-1-2逆向流場 38
3.6.5. 阻礙物置中,D1*=0.25,D2*=0.375 38
(1) Case1-2-2順向流場 38
(2) Case2-2-2逆向流場 39
3.6.6. 阻礙物於下方、中間,D1*=D2*=0.375 39
(1) Case1-3-2順向流場 39
(2) Case2-3-2逆向流場 39
3.6.7. 阻礙物於上方、右側,D1*=0.125,D2*=0.625 40
(1) Case1-1-3順向流場 40
(2) Case2-1-3逆向流場 40
3.6.8. 阻礙物於中間、右側,D1*=0.25,D2*=0.625 40
(1) Case1-2-3順向流場 40
(2) Case2-2-3逆向流場 41
3.6.9. 阻礙物於下方、右側,D1*=0.375,D2*=0.625 41
(1) Case1-3-3順向流場 41
(2) Case2-3-3逆向流場 42
3.7. 無因次質傳遞率Sh值分析 42
3.7.1. Sh與熱質順向、逆向之關係 43
3.7.2. Sh與Grt之關係 43
四、 結論 44
4.1. 流場形態分佈 44
4.2. 流場溫度分佈 45
4.3. 流場濃度分佈 45
4.4. 無因次質傳遞率 45
4.5. 相同Grt、Grm與低展弦阻比矩形阻礙物之封閉盒內熱質自然對流現象探討比較 46
4.6. 與蔡宏源【19】不同位置之阻礙物比較 46
參考文獻 47
參考文獻
1.S. Ostrach, "Natural Convection with Combined Buoyancy Forces", Physico Chem. Hydrodyn, Vol.1, pp.233-247, (1980).
2.H. Stommel, A. B. Arons and D. Blanchard, "An Ocean Graphical Curiosity the Perpetual Salt Fountain", Deep. Sea Res., Vol.15, pp.275-280, (1956).
3.J.S. Turner, "The Behavior of a Stable Salinity Gradient Heat from Below", J. Fluid Mech. Vol.33, pp.183-200, (1968).
4.Y. Kamotani, L.W. Wang, S. Ostrach and H.D. Jiang, "Experimental Study of Natural Convection in Shallow Enclosures with Horizontal Temperature and Concentration Gradients", Int. J. Heat Mass Transfer, Vol.28, No.1, pp.165-173, (1985)
5.C.R. Wilke, M. Eisenberg and C.W. Tobias, "Correlation of Limiting Currents under Free Convection Conditions", J. of the Electrochemical Society, Vol.100, pp.513-523, (1953).
6.L.W. Wang and D.J. Sun, "Convection Mass Transfer in Enclosures with Vertical Temperature and Concentration" J. of National Cheng-Kung University, Vol.20, pp.313-322, (1985).
7.V.G. Levich, "Physicochemical Hydrodynamics (1st edition) ", pp.281 Prentice-Hall, Englewood Cliffs nj, (1962).
8.T. Mizushina, "The Electrochemical Method in Transport Phenomena", Adv. Heat Transfer, Vol. 7, pp.87-161, (1971).proc. heat transfer fluid mech. inst. pp.63-78, (1966).
9.L.W. Wang and C.C. Chou, "Experimental Study of Natural Convection Heat and Mass Transfer in an Enclosure with a Cold Inner Cylinder", Experimental Heat Transfer, Vol.4, pp.367-380, (1991).
10.Arnab Kumar De, Amaresh Dalal "A Numerical Study of Natural Convection Around a Square, Horizontal, Heated Cylinder Placed in an Enclosure", Heat and Mass Transfer, (2006).
11.M. El Alami , M. Najam , E. Semma , A. Oubarra , F. Penot, "Electronic Components Cooling by Natural Convection in Horizontal Channel with Slots", Energy Conversion and Mangement.46 pp.2762-2772 (2005)
12.Qi-Hong Deng, Guang-Fa tang, "Numerical Visualization of Mass and Heat Transport for Conjugate Natural Convection/Heat Conduction by Streamline and heatline", Int. J. of Heat and Mass Transfer.45 pp.2373-2385 (2002).
13.Shohel Mahmud, "Free Convection inside an L-Shaped Enclosure", Int. Comm. Heat Mass Transfer.29 pp.1005-1013 (2002)
14.G..Cesini , M . Paroncini , G . Cortella , M . Manzan, "Natural Convection from a Horizontal Cylinder in a Rectangular Cavity", Int. J. Heat and Mass Transfer.42 1801-1811, (1999).
15.C Gau, K.H. Wu, " A Nonintrusive Technique for Concentration Distribution Measurement in Enclosure" , Experiment Heat Transfer, Vol.2, pp.215-226, (1989).
16.吳開宏『方形盒內質熱自然對流之實驗與理論分析』,國立成功大學,博士論文,民國80年。
17.王士榮,『具隔板之傾斜盒中熱質自然對流現象』,私立元智大學,博士論文,民國91年。
18.康明方,『具階梯之密閉盒著熱質自然對流現象』,私立元智大學,碩士論文,民國93年。
19.蔡宏源,『密閉盒中不同阻礙物對熱質自然對流的影響與探討』,私立元智大學,碩士論文,民國97年。
20.曾博聖,『具低展弦比矩形阻礙物之封閉盒內熱質自然對流現象探討』,私立元智大學,碩士論文,民國98年。
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top