臺灣博碩士論文加值系統

本實驗探討不同圓錐角，不同粒子，不同床高下的噴流情形。並研究以上各操作變數對最小噴流化速度的影響；並用Fourier transform及wavelet transform將原始數據轉換作分析。
實驗結果顯示，壓力擾動可以準確判斷流態變化。如內部噴泉於圓錐處產生循環時，在床底所量測到的壓力擾動會有明顯改變。而在最小噴流化速度時，床內管壁所量測到的壓力擾動則會有一特殊的跳躍。實驗中當床高、粒徑及圓錐角度增加時，所對應的最小噴流化速度會隨之上升。又原始數據經FFT（快速傅利葉轉換）轉換後，發現於圓錐處產生循環時，床底會偵測到能量集中的主頻，而在最小噴流化速度後，床內管壁則會量測到低頻的擾動。將原始數據經wavelet 轉換後，依不同的頻率大小分成不同的區間，可利用其中的幾個頻率區域的擾動變化，與內部流態之改變相比較，以準確的判斷噴流床的操作情形。

The effects of different cone angle, particle size and bed height on the minimum spouting velocity, were studied with standard deviations and pressure drop. And analyzed these data with Fourier transform and Wavelet transform.
The results showed that standard deviations of pressure drop not only exactly describe the transition of regime but also determine minimum spouting velocity. We find minimum spouting velocity increase with bed height, cone angle and particle size. After transform these data with Fourier analysis, we can find major frequency in the frequency map is changed with the variation of hydrodynamic. And with Wavelet transform, these data could be divided into several scales with different frequencies. Then we could find that the change of the major frequency scales are responded to the hydrodynamic changes.

目 錄
中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
圖表索引 Ⅵ
一、 緒論…………………………………………………….
二、 文獻回顧
2-1. 噴流床之構造……………………………………….
2-2. 噴流床之特色………………………………………
2-3. 噴流床的流態變化…………………………….
2-4. 噴流床的運動機構………………………………
2-5. 最小噴流化速度………
2-6. 最大可噴流床高……………………………………………….
2-7. 噴流床之壓降…………………………..
2-8. 噴流床之穩定性………………………………………
2-9. 噴流床的應用
三、 實驗裝置與步驟……………………………………….
3-1. 實驗裝置………………………………………….
3-2. 實驗步驟……………………………………….
3-3. 數據分析……………………………………….
3-3.1. fourier transform
3-3.2. wavelet transform………………………………….
四、 結果與討論…………………………………………..
4-1. 不同位置下壓降與流速的關係..
4-2. 壓力擾動標準偏差與流速的關係………………………
4-3. 最小噴流化速度……………………………
4-4. Fourier transform後，頻率域與流態變化之關係……………………
4-5. Wavelet transform後，頻率區間之SD與流態變化之關係
4-6. 床高、粒徑、圓錐角度對系統流態的影響
4-6.1. 床高對系統流態的影響
4-6.2. 粒徑對系統流態的影響………………………………….
4-6.3. 圓錐角度對系統流態的影響
4-7. 不規則粒子系統的討論
五、 結論…………………………………………………….
六、 符號說明………………………………………………
七、 參考文獻……………………………………………..
附錄

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