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題 名 | Normal Stress of Wastewater Sludge=廢水污泥之正向應力 |
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作 者 | 顏佩珊; 李篤中; 尤學一; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 35:5 2004.09[民93.09] |
頁 次 | 頁581-586 |
分類號 | 445.84 |
關鍵詞 | 廢水污泥; 正向應力; Normal stress; Flocculation; Visco-elastic; Shear; |
語 文 | 英文(English) |
中文摘要 | 本研究以AR1000-N黏度計測量原始及絮凝廢水污泥受剪力時之剪應力及對下板之正向總應力。廢水污泥不僅是一非牛頓流體,且是一黏彈性流體。在剪應力到達極大值前,廢水污泥受剪力時並無法流動,且此時其正向應力極低,即原始污泥不易被剪切但易被拉伸。在經充分剪切後,污泥之黏性變低,但正向應力上升,即經剪切後之污泥易被剪切但不易被拉伸。此現象應肇因於剪切可建立污泥中之網絡彈性。而加入高分子可增強網絡強度,進而抑制彈性及黏性變形。 |
英文摘要 | Shear stress and total thrust on the bottom plate for wastewater sludge subjected to shear were measured using an AR1000-N rheometer. Wastewater sludges are demonstrated not only a non-Newtonian fluid, but also a visco-elastic fluid. Before the stress reaching the peak stress. The wastewater sludge is not really flowable at shearing. But the sludge exhibits a rather low normal stress. The unsheared sludge is resistant to shearing but is readily normally elongated. After sufficient shearing, the sheared sludge exhibits a low viscosity, meanwhile, the corresponding normal stress has been increased to a high value. Sufficiently sheared sludge is relatively easy to shear, but very resistant to normal elongation. This occurrence is attributable to the development of elasticity of the sludge network during shearing. Adding cationic polyelectrolyte into sludge could enhance its network strength to resist both plastic and elastic deformation. |
本系統中英文摘要資訊取自各篇刊載內容。