Effect of particle size and fluid viscosity on microfiltration characteristics
| Autor: | Iou-Liang Lin, 林宥良 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 The effects of filtration pressure, particle diameter and fluid viscosity on the filtration flux, cake porosity and average specific cake filtration resistance in dead-end constant pressure microfiltration are studied. A filter membrane made of mixed cellulose ester with a mean pore size of 0.1 μm is used for filtering 0.4 μm and 5 μm particle mixtures with different mixing ratios. An increase in filtration pressure leads to a lower average cake porosity and higher specific cake filtration resistance due to larger fluid drag acting on the particle surfaces. Since lower local solid compressive pressure exists in the region near the surface of a thicker cake, the local cake porosity becomes lower. The average specific filtration resistance increases with increasing the mixing ratio of finer particles. However, the lowest cake porosity occurs for a 0.75 coarser particle mixing ratio. When fluid viscosity increases from 1 cp to 5 and 10 cp, the cake porosity increases 11.92% and 18.33%, respectively, while the average specific filtration resistance decreases 12.17% and 29.38%, respectively. In conclusion, fluid viscosity plays a major role on the filtration performance; however, its effect on the cake compressibility can be ignored. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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