垂直放置鰭片之自然對流熱傳性能實驗研究

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姓名

李冠賢(Guan-shian Li) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

垂直放置鰭片之自然對流熱傳性能實驗研究
(An experimental investigation of natural convection heat transfer in vertical fin)

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摘要(中)

本實驗在固定鰭片正向面積條件下，設計九種不同幾何尺寸及型式之散熱鰭片，包括：垂直平板、直線鰭片、斷續型鰭片、漸長斷續型鰭片。改變直線鰭片的鰭片間距、鰭片高度，及斷續型鰭片的鰭片長度，以實驗方法探討鰭片垂直放置時的自然對流熱傳性能，及各參數對熱傳性能的影響。
垂直平板平均熱傳係數最高，但因散熱面積較小，所以總熱傳量最低。鰭片間距為影響直線鰭片熱傳係數的主要參數，鰭片間距較寬時，熱傳係數較高，間距16 mm直線鰭片比間距7 mm直線鰭片熱傳係數高79 ~ 114 %。而鰭片高度並無法顯著影響鰭片熱傳係數，高度15 mm直線鰭片平均熱傳係數比間距7 mm直線鰭片僅高6 ~ 20 %。斷續型鰭片單一鰭片長度，對斷續型鰭片平均熱傳係數並無顯著影響，且斷續型鰭片和有相同鰭片間距的間距7 mm直線鰭片平均熱傳係數約相同。

摘要(英)

An experimental investigation of natural convection heat transfer in nine vertical fins having the same frontal area is described. There are four types of fin which are flat plate fin, straight fin, offset strip fin and offset strip increase in length fin with different space, height and length of discrete plates.
Flat plate fin has highest heat transfer coefficient and smallest heat transfer rate in all fins. The chief geometric feature for effecting on heat transfer coefficient is fin space. Larger fin space leads to higher heat transfer coefficient. Heat transfer coefficient for 16 mm space of straight fin is better then 7 mm space by 79 ~ 114 %. Fin height effects on heat transfer coefficient insignificantly. Heat transfer coefficient for 15 mm height of straight fin is better then 7 mm space by 6 ~ 20 %. Length of discrete plates of offset strip fin effects on heat transfer coefficient insignificantly. In the same fin space, the heat transfer coefficient of offset strip fin is almost equal to the 7 mm space of straight fin.

關鍵字(中)

★ 自然對流
★ 垂直平板
★ 直線鰭片
★ 斷續型鰭片

關鍵字(英)

★ flat plate
★ straight fin
★ offset strip fin
★ natural convection

論文目次

摘要i
Abstractii
致謝iii
目錄v
表目錄ix
圖目錄x
符號說明xiii
第一章前言1
1.1 研究背景與動機1
1.2 現階段散熱鰭片之研究發展2
1.3 研究目的3
第二章文獻回顧8
2.1 直線鰭片(Straight fin)8
2.1.1 鰭片長度(L)8
2.1.2 鰭片間距(S)10
2.1.3 鰭片高度(H)12
2.1.4 直線鰭片總結15
2.2 斷續型鰭片(Offset strip fin, OSF)15
2.2.1 鰭片間距(S)16
2.2.2 單一鰭片長度(b)17
2.2.3 斷續型鰭片總結18
2.3 總結18
第三章實驗方法31
3.1 散熱鰭片幾何尺寸設計31
3.1.1 垂直平板(Flat plate)31
3.1.2 直線鰭片(Straight fin)31
3.1.3 斷續型鰭片(Offset strip fin, OSF)33
3.1.4 漸長斷續型鰭片(Offset strip increase in length fin, OSIF)33
3.2 散熱鰭片製作34
3.3 實驗系統35
3.3.1 測試段35
3.3.2 測試腔體35
3.4 實驗量測儀器與設備36
3.4.1 溫度量測36
3.4.2 加熱功率量測37
3.4.3 資料擷取系統37
3.5 實驗步驟37
3.6 數據換算38
3.6.1 熱傳率38
3.6.2 熱損39
3.6.3 空氣溫差40
3.6.4 平均熱傳係數40
第四章實驗結果與討論63
4.1 散熱鰭片局部空氣溫度差63
4.1.1 垂直平板(Flat plate)與直線鰭片(Straight fin)63
4.1.2 斷續型鰭片(OSF)與漸長斷續型鰭片(OSIF)66
4.1.3 全部散熱鰭片比較67
4.2 散熱鰭片熱傳量對平均溫度差的影響67
4.2.1 垂直平板(Flat plate)與直線鰭片(Straight fin)67
4.2.2 斷續型鰭片(OSF)與漸長斷續型鰭片(OSIF)68
4.2.3 全部散熱鰭片比較70
4.3 散熱鰭片平均溫度差對平均熱傳係數的影響70
4.3.1 垂直平板(Flat plate)與直線鰭片(Straight fin)70
4.3.2 斷續型鰭片(OSF)與漸長斷續型鰭片(OSIF)72
4.3.3 全部散熱鰭片比較74
第五章結論94
參考文獻95
附錄、實驗誤差分析98

參考文獻

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指導教授

楊建裕(Chien-yuh Yang)

審核日期

2010-3-22

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