臺灣博碩士論文加值系統

本研究利用實驗方法分析管道內裝置往復運動的圓柱之後，對凸塊壁面附近速度以及溫度場的影響，且進一步探討凸塊壁面熱傳的增益。數值方面，利用流體力學計算軟體模擬實際情形，驗證實驗裝置的正確性。實驗方面，主要探討當振動圓柱在不同的振幅、振動頻率、雷諾數狀態下，對管道內凸塊壁面的熱傳效率影響。
由研究結果得知，在流場中圓柱進行往復式的振盪運動，受到圓柱牽引的效應，使管道內的流體呈現上下振盪的現象，引導流體向壁面衝擊，擾亂在圓柱後方壁面的流場，為提高熱傳效率的主要機制。此外，當圓柱振動的頻率接近流場的自然振動頻率時，會與管道內的流體產生共振的現象，此現象能夠大幅的增加流體的擾動，並且擾亂管道內的流場以及溫度場，產生較佳的熱傳增益。

The study investigates the heat transfer enhancement by a reciprocated oscillating cylinder in a channel flow. The characteristics of flow and thermal fields are analyzed experimentally. In the numerical analysis, computational fluid dynamics software is adopted to solve the flow and thermal fields. In the experimental investigation, the effects of Reynolds number, oscillating amplitude and oscillating frequency on the heat transfer characteristics of a heated block in the channel are examined.
The results show that the oscillating cylinder induces the flow vibration. This phenomenon would disturb the flow and thermal fields in the channel flow, and the heat transfer rate in the channel would be enhanced. Furthermore, as the oscillating frequency of the cylinder approach the natural vortex shedding frequency, because of the phenomenon of resonance in the channel flow, and the heat transfer rate is enhanced more remarkably.

摘 要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
符號說明 ix
第一章 緒論 1
第二章 振動圓柱對加熱凸塊之熱流實驗 8
2.1 物理模式 8
2.2 實驗設備 8
2.2.1 加熱裝置與溫度量測裝置 8
2.2.2 風洞與風速量測裝置 15
2.2.3 往復運動機構 17
2.3 實驗步驟 24
2.3.1 管道流流速量測 24
2.3.2 啟動往復運動 24
2.3.3 壁面溫度量測 27
第三章 數值模擬 33
3.1 物理模式 33
3.2 數值計算 33
3.3 邊界條件 36
3.4 數值方法 36
3.5網格建立與網格測試 40
第四章 結果與討論 44
4.1 空管性能驗證 44
4.1.1速度分布驗證 44
4.1.2溫度分布驗證 48
4.2 加熱凸塊受振動圓柱頻率、振幅及雷諾數之影響討論 58
4.2.1圓柱振動頻率對熱傳之影響 61
4.2.2圓柱振幅對熱傳之影響 65
4.2.3流體進口雷諾數對熱傳之影響 65
第五章 結論 71
參考文獻 72
附錄：實驗不準度分析 75

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