Permeate Flux Analysis of Ultrafiltration in Various Tubular Membrane Modules
| Autor: | Chia-Hsing Li, 李佳興 |
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| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 The correlation equations for predicting local and average permeate fluxes in tubular-membrane ultrafilters was derived from mass and momentum balances by the modified resistance-in-series model with the consideration of concentration polarization along the membrane tube. Ultrafiltration of Dextran T500 aqueous solution in a tubular microporous ceramic module has been carried out under various operation conditions, in which experimental data of ten local permeate fluxes along the tube were obtained to confirm the correlation predictions. The increment of concentration polarization, as well as the decline of permeate flux, along the tube was also discussed. The theoretical predictions and experimental study were also carried out for ultrafiltration in a tubular module inserted concentrically with a steel rod wrapped by rings with various ring distances also the flow channel. Considerable improvement in performance was obtained by properly adjusting the ring distance, so that the undesirable concentration polarization resistance is suppressed while still preserving the effective transmembrane pressure. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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