臺灣博碩士論文加值系統

衝擊噴流空氣冷卻具有高熱傳遞率與質量傳遞率等特性，因此被廣泛的應用在工業上，如鋼板的冷卻、紙張的乾燥、渦輪機的冷卻等。搭配適當幾何外型的散熱片與衝擊噴流則能夠達到最佳的散熱效果。
本論文藉由實驗與模擬方式分析平板形散熱片外型的最佳化，在固定加熱量下，改變鰭片的長度、寬度與雷諾數等參數，探討各參數對於散熱效益的影響。研究中發現雷諾數大小會影響散熱效益，隨著雷諾數增加，其影響效益會逐漸減緩。在固定底板尺寸的條件下，鰭片寬度會影響流道大小，當鰭片寬度較大時，低速之衝擊流體較難流入散熱片內部散熱，使熱傳效益下降，因此需要更高速的衝擊流流，才能有效地降低溫度。在固定鰭片寬度下，鰭片長度為改變散熱表面積的因素，增加鰭片高度可以有效地增加散熱效益。
研究中發現模擬與實驗結果有相同的趨勢，隨著雷諾數增加，熱阻值會下降。在高雷諾數時，寬度與長度較大的散熱片能夠有效地增加散熱效果。

Because of the characteristic of high heat transfer rate and mass transfer rate, the impinging air cooling is widely utilized on industrial applications including, among others, the cooling of steel plates, the drying of paper, the cooling of turbines. The impinging jet is combined with the appropriate geometrical shape of heat sink for the highest heat transfer rate.
In this thesis, experimental and simulated methods are used to analyze the optimal shape of the plate heat sinks. By changing the height and the width of the fin and the Reynolds number, the effects of the parameters on the heat transfer are investigated for a constant heating rate. The research reveals that the Reynolds number influences the heat transfer and the enhancement decreases gradually as the Reynolds number increases. The width of the fin will influence the size of the flow channel for a constant substrate area. When the width of the fin is bigger, the lower velocity impinging jet is difficult to flow into the heat sink and the heat transfer will decrease. Therefore higher velocity impinging jets are needed to reduce the temperature effectively. The height of the fin is a factor to change the heat transfer area for a constant fin width. The heat transfer can be increased effectively by increasing the fin height.
In the study, it is found that the simulated and the experimental results have the same trend. The thermal resistance decreases as the Reynolds number increases. At high Reynolds numbers, heat sinks with wider and higher fins can increase the heat transfer effectively.

誌 謝 I
摘要 II
ABSTRACT III
目錄 V
表錄 IX
圖錄 X
符號說明 XVI
一、前言 1
二、文獻回顧 2
2.1 各類散熱片之最佳化 3
2.1.1 柱型鰭片 3
2.1.2 平板型鰭片 4
2.2 各類散熱片之性能比較 6
2.3 流場的影響 8
2.4 紅外線熱影像儀之應用 9
三、理論模式 11
3.2 紊流模式 12
3.3 壁面函數 14
3.4 固體熱傳導 16
3.5.1 入口邊界條件 16
3.5.2 壓力邊界條件 17
3.5.3 對稱面邊界條件 17
3.5.4 壁面邊界條件 18
3.5.5 加熱面與熱傳導固體邊界條件 18
3.5.6 固體與流體介面 18
3.6 離散化 19
3.7 整體熱傳效益 19
3. 8 熱阻 19
四、實驗設備與方法 23
4.1 實驗設備 23
4.2 衝擊噴流裝置 23
4.3 實驗模型 23
4.4 實驗環境 24
4.4.1 實驗步驟 24
4.4.2 實驗數據處理 27
五、結果與討論 32
5.1 壓力與速度分布 33
5.2 散熱片外型效益 34
5.2.1 鰭片寬度的效應 34
5.2.2 鰭片長度的效益 36
5.3 實驗結果 36
5.4不同雷諾數下散熱片的熱阻值 38
5.4.1散熱片在衝擊噴流Re＝10000下的散熱效益 39
5.4.2散熱片在衝擊噴流Re＝20000下的散熱效益 39
5.4.3散熱片在衝擊噴流Re＝30000下的散熱效益 39
六、結論與未來展望 75
6.1 結論 75
6.2 未來展望 76
參考資料 77

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