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研究生:陳冠宇
研究生(外文):Chen, Kuan-Yu
論文名稱:半凹窩型渦流產生器於鰭管式熱交換器之應用
論文名稱(外文):The study of fin-and-tube heat exchangers with vortex generators-in the shape of half-dimple
指導教授:王啟川王啟川引用關係
指導教授(外文):Wang, Chi-Chuan
學位類別:碩士
校院名稱:國立交通大學
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:2012
畢業學年度:100
語文別:中文
論文頁數:76
中文關鍵詞:鰭管式熱交換器渦流產生器
外文關鍵詞:fin-and-tube heat exchangervortex generator
相關次數:
  • 被引用被引用:0
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  • 下載下載:75
  • 收藏至我的研究室書目清單書目收藏:2
  本文探討一種新世代,可應用於鰭管式熱交換器(Fin-and-Tube Heat Exchangers)的鰭片,即是將渦流產生器(Vortex Generators,VG)應用於鰭片上。渦流產生器據信是一種,僅僅小幅地增加壓降,但卻能大幅提高熱傳的方法。
  本文以理論設計,決定以一”半凹窩型”(half-dimple)渦流產生器,作為本實驗的渦流產生器種類。接著再以數值模擬,試圖找出擺放最佳的位置,以及排列的方法。模擬的結果顯示:以V型排列,不但能有效提升熱傳效果,更能利用通過前方VG的渦流,有效地減小壓降,故採用此種設計。
  在實驗時,一共探討的變數有:兩種鰭片間距(1.6mm、2.0mm)、三種管排數(1、2、4排)、以及三種鰭片種類(平板、渦流產生器、百葉窗),共十八種測試物;再配合0.5、1、1.5、2、3、4、5米等共七個風速。結果顯示:在多數的情況下,百葉窗型鰭片(louver)仍然有較好的熱傳表現。但是,當鰭片間距由1.6mm增至2.0mm,百葉窗鰭片的熱傳性能下降,但對於VG型鰭片而言,影響卻不大,甚至在低風速時,其效率會勝過百葉窗型鰭片。

  This study develops a new style fin having vortex generator configuration which is used in fin-and-tube heat exchangers. Vortex generators were commonly used in aircraft to reduce separation.  
  There are many style vortex generators. In this study, we develop a new style having a “half-dimple” configuration. In the design stage, CFD is employed to locate the best position and the arrangement. The result is deployed in a “V” arrangement for the purpose of decreasing the pressure drop. The simulation results are then used to develop the prototype of actual fin-and-tube heat exchangers.
  In the experiment, the effect of fin pitches ((1.6mm, 2.0mm), and the number of tube row (1, 2, 4rows) for three kinds of fin style (plain, vortex generators, louver) are examined. The frontal velocity ranges from 0.5 to 5 m/s. The results show that louver fin outperforms other fin patterns in most cases. However, when the fin pitch is increased from 1.6 mm to 2.0 mm, the heat transfer coefficient of louver fin will decrease considerably. But for the vortex generators case, the influence is quite small. Even in the low velocity, the efficiency of vortex generator will be better than the louver fin

摘要 I
ABSTRACT II
致謝 III
目錄 IV
表目錄 VII
圖目錄 VIII
符號說明 XII
第一章 緒論 1
1.1前言 1
1.2研究背景 2
1.3研究動機 4
1.4本文架構 4
第二章 文獻回顧 8
2.1渦流產生器 8
2.2凹洞技術 9
2.3排列方式 11
2.4理論設計 12
第三章 數值模擬 15
3.1程式介紹 15
3.2操作步驟 15
3.2.1幾何模型 15
3.2.2邊界條件 16
3.2.3網格 16
3.2.4初步結果 17
第四章 實驗部分 26
4.1 實驗設備 26
4.1.1風洞系統 26
4.1.2水循環系統 27
4.1.3資料蒐集系統 28
4.1.4待測物 28
4.2實驗步驟 29
4.3理論分析 30
4.3.1熱傳部分 30
4.3.2壓降部分 34
4.3.3不同類型鰭片比較 37
第五章 結果與討論 56
5.1鰭片間距同為1.6mm 56
5.2鰭片間距同為2.0mm 57
5.3鰭片間距的影響 57
5.5散熱性能評價VG-1 58
5.6散熱性能評價FG-3 59
5.7 實際上之應用 60
第六章 結論 72
參考文獻 73
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