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| 題 名 | Effects of Pore Geometry on Intrafloc Flow=內孔幾何形狀對膠羽內部流之影響 |
|---|---|
| 作 者 | 朱敬平; 李篤中; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
| 卷 期 | 35:6 2004.11[民93.11] |
| 頁 次 | 頁659-666 |
| 分類號 | 460.02 |
| 關鍵詞 | 內孔幾何形狀; 膠羽內部流; 廢水污泥; 膠羽; Floc structure; Advective flow; Geometry; Pressure drop; Simulation; |
| 語 文 | 英文(English) |
| 中文摘要 | 廢水污泥膠羽之內部流動主要由其中之大孔道所控制,而經由螢光原位雜交法(FISH)及掃描式聚焦雷射顯微攝影(CLSM)技術可發現膠羽內之大孔道為具非圓形截面及碎形邊界之扭曲孔道,因此欲進行數值模擬前必須簡化孔道幾何形狀之複雜度。本文以數值模擬探討孔道邊界粗糙度、扭曲度及截面形狀對流場及壓降之影響,結果顯示孔道扭曲度因可改變主流場方向而對壓降有最大之影響,其次邊界上之“主要”粗糙度亦為一重要之幾何參數,而在大範圍之尺寸比下非圓形截面對膠羽之內部流動影響不大,正確找出孔道質量中心以決定其扭曲度成為建立適當污泥膠習內部流動模型之關鍵因素。 |
| 英文摘要 | Large pores in wastewater sludge floc control intrafloc advective flow. Such pores, probed using fluorescence in situ hybridization (FISH) and the confocal laser scanning microscope (CLSM) technique, exhibited zigzagging with a non-circular cross-section and fractal-like boundary. Simplification of the complicated pore structure was needed before modeling could be conducted. This work demonstrated, using numerical simulation, how the roughness of the pore boundary, the pore zigzaggedness and the shape of the pore cross-section affected the flow field and the associated pressure drop in a simulated pore. Simulation revealed that the pore zigzaggedness changed the direction of main-stream flow in pore mostly affected the pressure drop. The “main” boundary irregularity was also found to be an important geometric parameter. Over a wide range of aspect ratios, the non-circular (elliptic) had cross-section only a mild effect on the advective flow. Correctly allocating the centroids of pores in order to reveal their zigzaggedness is necessary to adequately model advective flow through floc pores. |
本系統中英文摘要資訊取自各篇刊載內容。