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研究生:尤逸玄
研究生(外文):Yi-Hsuan Yu
論文名稱:可變形次微米粒子之掃流過濾
論文名稱(外文):Cross-flow Filtration of Deformable Submicron Particles
指導教授:黃國楨黃國楨引用關係
指導教授(外文):Kuo-Jen Hwang
學位類別:碩士
校院名稱:淡江大學
系所名稱:化學工程學系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:110
中文關鍵詞:微過濾掃流過濾薄膜過濾可變形粒子次微米粒子
外文關鍵詞:micron filtrationcross-flow filtrationmembrane filtrationdeformable particlessubmicron particles
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本研究以可變形次微米粒子作掃流微過濾之研究與探討,內容分為實驗,粒子受力分析及濾餅之動態解析與分析,以期能找到本實驗中之過濾機構。
本實驗以假單孢菌溶液為對象對不同之操作條件作探討,結果發現掃流過濾之操作壓差愈大,則其濾速反而會愈低,掃流速度愈大則濾速會跟著提高,懸浮液之濃度愈高則濾速會較低。而由掃瞄式電子顯微鏡之照片則可看出於緊鄰薄膜處有一由可變形粒子所形成之極為緻密的表皮層。
為了探求其過濾機構,因此利用數值方法作濾餅內之局部動態解析。此濾餅局部動態解析考慮面接觸可進一步分析濾餅孔隙度、濾阻、及固體壓縮壓力之分佈。而結果顯示於濾材上形成之表皮層雖只佔濾餅不到一成的厚度,卻是濾阻形成之主因,且增大壓差將導致表皮層更緊密以致濾阻變大。因此整合了上述分析便能較完整的了解過濾情形,進而能進一步的提供改善濾速的方法。

The mechanism of cross-flow filtration of deformable submicron particles is studied. This research includes force analysis on depositing particles, dynamic analysis on local cake properties, and cross-flow filtration experiments.
Cross-flow microfiltration were carried out by using pseudomas susprnsions. The effect of operating conditions, such as cross-flow velocity, filtration pressure, and suspension concentration, on the filtration performance are deeply discussed. The results show that the filtration rates increase with the increase of cross-flow velocity, decrease of filtration pressure, and decrease of suspension concentration. The photographs of scanning electronic microscope show that a skin layer with most compact structure may form nearby the membrane surface for the filtration of deformable particles.
A numerical program based on material balance and theory is established for simulating the local porosity, filtration resistance, and solid copressive pressure in a filter cake. The variation of specific surface area due to area contact between particles during a filtration is taken into account. It can be found that a skin layer which control the filtration rate will form near the filter membrane in a membrane filtration of deformable submicron particles. Although the thickness of a skin layer is only 10% for whole cake, it plays a role of 90% filtration resistance.

誌謝 I
中文摘要 II
英文摘要 III
目錄 V
圖表索引 VI
第一章 緒論 1
第二章 文獻回顧 4
2-1可變形粒子之堆積特性 4
2-2次微米粒子之泥漿輸送 9
2-3生物粒子在過濾中之性質 12
2-4可變形粒子之掃流過濾及其發展 13
第三章 理論 19
3-1掃流過濾中粒子受力解析 19
3-2粒子在濾面上之附著機構 29
3-3濾餅局部性質之動態解析 37
第四章 實驗裝置與步驟 46
4-1掃流過濾實驗裝置 46
4-2實驗步驟 46
第五章 結果與討論 50
5-1可變形次微米粒子之掃流過濾特性 50
5-2粒子之受力分析 62
5-3臨界摩擦角之探討 68
5-4粒子在濾器內之運動 72
5-5掃流過濾之動態解析 76
第六章 結論 94
符號說明 96
文獻回顧 100
附錄A 104
附錄B 108

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