臺灣博碩士論文加值系統

本研究在討論單一液相及氣液兩相下，探討不同操作參數（氣體流速及液體流速）時，改變傾斜角度對可溶固體壁溶解速率及流態的影響。 本實驗中，氣體流速的範圍為0.02∼1.80 m/s，液體流速的範圍為0.50∼1.62 m/s，傾斜角度有0度，45度及90度。實驗使用之固體壁溶質為尿素，溶劑為去離子水。
實驗結果顯示，氣液兩相流動系統下的尿素溶解速率遠大於單一液相流動系統。在氣液兩相系統中，質傳係數隨氣體流速增加而增加，尤其當傾斜角度為45度或90度時。在低氣體流速下，45度傾斜之質傳係數最大，而在高氣體流速下，則以90度者為最大。

This work investigated the influence of inclination angle on the dissolution rate of soluble-wall under liquid-phase or gas-liquid two-phase flow. The experiments were carried out in the range of 0.02~1.80 m/s gas superficial velocity and 0.50~1.62 m/s liquid superficial velocity. The inclination angle included 00,450,and 900(vertical).The soluble-wall is made of urea and deionized water is used as the solvent.
Experimental result show that the mass transfer coefficient of the two-phase system is significantly larger than that of liquid —phase system. In two-phase system, the mass transfer coefficient increase with the increase of gas velocity, especially for operating at 450 or 900. At low gas velocity, the mass transfer coefficient of 450 system is the highest. At high gas velocity, the 900 system has a larger mass transfer coefficient.

目錄
圖索引Ⅳ
表索引Ⅷ
第一章 緒論1
1.1前言及動機1
1.2本研究之目標3
第二章 文獻回顧5
2.1影響濾速的因素5
2.2提高濾速之方法7
2.3氣液兩相流態14
第三章 理論分析 22
3.1單一液相質傳速率之分析22
3.2氣液兩相質傳速率之分析24
3.2.1垂直管狀膜之氣泡上昇25
3.2.2薄層區域下的質量傳送27
3.2.3過渡區域下的質量傳送28
3.2.4液泡區域下的質量傳送30
第四章 實驗裝置與方法36
4.1實驗裝置 36
4.2尿素固定壁之製備 36
4.3實驗方法與操作條件 37
4.4尿素溶液之物性 38
第五章 結果與討論 41
5.1質傳速率k值之求法 41
5.2單一液相之質傳速率 42
5.2.1垂直管系統 42
5.2.2傾斜管系統 43
5.3氣液兩相流之質傳速率 43
5.3.1垂直管系統44
5.3.2傾斜管系統45
5.4氣液兩相流之流態觀察45
5.4.1垂直管系統之流態45
5.4.2傾斜管系統之流態46
5.5質傳係數理論值與實驗值之比較47
第六章 結論 87
符號說明89
參考文獻 91

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