跳到主要內容

臺灣博碩士論文加值系統

(35.172.136.29) 您好!臺灣時間:2021/07/29 08:36
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

我願授權國圖
: 
twitterline
研究生:黃紹航
論文名稱:百葉窗型熱交換器鰭片表面特性對熱對流係數影響之數值分析
論文名稱(外文):Numerical Analysis of Surface Characteristics on Effects of Heat Transfer Coefficient in Louver Fin-and-Tube Heat Exchangers
指導教授:陳理定
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:64
中文關鍵詞:百葉窗型散熱片
相關次數:
  • 被引用被引用:0
  • 點閱點閱:121
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
摘要

本論文針對百葉窗型散熱片來作研究,以找出其表面特性與熱對流係數之關係,並對鰭片表面作不同切片時,熱對流係數的變化,以及對其熱傳導的影響,進而評估以基本理論做計算分析之可行性。
研究的方法是以基本理論配合數值計算的方法,以水力直徑 作為特徵長度,得到其相對應的雷諾數,再以平板流之紐塞爾數 理論,找出其熱對流係數以及熱傳因子 和摩擦因子 ,並以Wang [20]所提出的研究方法作應證,找出其相符之處,以及誤差的大小,接著再與平板型鰭片其熱傳性能及其壓降做比較。
結果發現以固定寬度對其鰭片做改變時,其切片對其熱對流係數 值的影響,與使用Wang[20]之法所計算出來的相符,而當對非固定寬度做討論時,則可得之使用基本理論法與Wang[20]之法所差異之處,而其熱傳性能比起平板型鰭片為佳,其熱對流係數 大約高有
,在 時,其百葉窗型鰭片的熱傳量比起平板型大約高出有 ,但其壓降卻也比平板型高出 。
ABSTRACT

This thesis is studied to the shutter type fin , in order to find out the relation between its surface characteristic and hot convection coefficient, and do a slice of surface of fin differently while cutting into slices, the change of hot convection coefficient, and the impact on its heat-conduction , and then assess the feasibility of making computational analysis with basic theories.
The method to study is the method of cooperating with number value to calculate with basic theories, regard diameter of water conservancy as the length of characteristic , get its corresponding Renaud to count , fills in and counts the theory in knob that and then flow with the plateform, find out its hot convection coefficient and heat and spread the factor and rub the factor, and do in conformity with the card with research approaches put forward of Wang [20 ], find out place that agree its, and size of error, slices of their hot to spread performance and is it is it compare to lower to pigeonhole with dull and stereotyped fin again then.
Found finally that while changing its fin slice with the regular width, it cut impact on its hot convection coefficient value into slices, conforming with used the law of Wang [20 ] to calculate out, and when discuss to the non- regular width , can must law place of difference of using basic theories the laws and Wang,and whether its the hot to spread compared with in fin not dull and stereotyped slice is good for performance , in when,its shutter the fins heat of stretch higher than not having compared with type not dull and stereotyped probably spreading amount, but it is also higher than the dull and stereotyped type that it is pressed and lowered.
參考文獻

1. F. E. M. Saboya and E. M. Sparrow, “Transfer characteristic of two-rowplate fin and tube heat exchanger configuration,” Int.J. Heat Mass Transer,Vol.9 , pp.41-49,1976.
2. J. Stasiulevicius and A. Skrinska, “Heat Transfer of Finned Tube Bundlesin Crossflow”, Hemispher Publishing, New York, 1988.
3. W. M. Kays and A. L. London, “Compact Heat Exchangers”,
McGrawHill, 2nd ed,New York, 1964.
4. S. Kakac, A. E. Bergles and F. Mayinger, “Thermal-Hydraulic Fundamentals and Design”, Hemispher Publishing, New York, 1981.
5. D. Q. Kern and A. D. Kraus, “Extended Surface Heat Transfer”,McGrawHill, New York, 1972.
6. F. C. McQuistion and J. D. Paker, “Heat Ventilating and Air Conditioning”, John Wiley & Sons, New York, 2nd ed, 1982.
7. Wang, C. C., Chen, P. Y., Jang, J. Y., “Heat transfer and frictioncharacteristics of convex-louver fin-and-tube heat exchangers”,Experimental heat transfer, Vol.9, pp.61-78, 1996.
8. Wang, C. C., Tsai, Y. M., Lu, D. C., “Comprehensive study
ofconvex-louver and wavy fin-and-tube heat exchangers”, Journal ofthermophysics and heat transfer, Vol.12, No.3, pp.423-430, 1998.
9. Hatada, T., Senshu, T., “Experimental study on heat transfercharacteristic of convex louver fin for air conditioning heatexchangers”, ASME paper 84-HT-74, 1984.
10. Hadata, T., “Improved heat transfer performance of air coolers bystrip fins controlling air flow distribution”, ASHRAE Trans., part 1pp.166-170, 1989. 5Wanget al.
11. Pauley, L. L., Hodgson, J. E., “Flow visualization of convex louverfin array to determine maximum heat transfer conditions”,Experimental thermal and fluid science Vol.9, pp.53-60, 1994.
12. Atkinson, K. N., Drakulic, R., Heikal, M. R., Cowell, T. A.,“Two-and-three-dimentional numerical models of flow and heattransfer over louver fin arrays in compact heat exchangers”,International Journal of Heat and Mass Transfer 41 pp.4063-4080,1998.
13. Springer, M. E., Thole, K. A., “Experimental design for flowfieldstudies of louvered fins”, Experimental Thermal and Fluid Science Vol.18, pp.258-269, 1998.
14. Bemisderfer, C. H., “Heat Transfer: A contemporary analytical toolfor developing improved heat transfer surface”, ASHRAE Trans.Part1, pp.1157-1166, 1987.
15. Suga, K., Aoki, H., Shinagawa, T., “Numerical analysis on
two-dimensional flow and heat transfer of louvered fins using overlaidgrids”, JSME International Journal Series Ⅱ , Vol. 33, No.1pp.122-129, 1990.
16. Suga, K., Aoki, H., “Numerical study on heat transfer and pressuredrop in multilouvered fins”, ASME/JSME Thermal Engineering Proceedings Vol.4, pp.361-368, 1991.
17. Hiramatsu, M., Ishimaru, T., Matsuzaki, K., “Research on fins airconditioning heat exchangers (1st Report, Numerical analysis of heattransfer on louvered fins)”, JSME International Journal Series Ⅱ,Vol.33, No.4, pp.749-756, 1990.
18. Wang, C. C., Liu, M. S., Leu, J. S., Liaw, J. S., “3-Dsimulation of theThermal-Hydraulic characteristics of Louvered Fin-and-Tube Heat Exchangers with Oval Tubes”, ASHRAE Annual Meeting, 2000.
19. 王啟川,熱交換器設計 ,五南圖書出版。
20. Wang, C.C., Lee, C.J., Chang, C.T., Lin, S.P., 1999e. Heat transfer and friction correlation for compact louvered fin-and-tube heat exchangers. Int. J. of Heat and Mass Transfer, 42(11) pp:1945-1956.
21. Wang, C.C.,K.U., 2000c. Heat transfer and friction characteristics of plain fin-and-tube heat exchangers:part2: correlation. Int. J. of Heat and Mass Transfer,43:2692-2700.
22. Kays, W.M., London A.L., 1984. Compact Heat Exchanger. 3rd
ed. New York:McGraw-Hill.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top