Pressure drops along the bores of hollow fibre membranes: Their measurement, prediction and effect on fibre bundle performance
Başlık çevirisi mevcut değil.
- Tez No: 400569
- Danışmanlar: DR. W. T. HANBURY
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1985
- Dil: İngilizce
- Üniversite: The University of Glasgow
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Makine Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 139
Özet
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Özet (Çeviri)
This thesis investigates the pressure drops along the bores of B-9 and B-10 hollow fibre membranes, their measurements, prediction and effect on fibre bundle performance. The theory of osmosis and reverse osmosis, the transport models, membrane configurations and productions were reviewed. Laminar flow in circular impermeable and porous pipes and the flow through a bundle of hollow fibres were also reviewed for the better understanding of the theoretical analysis. A theoretical model of the fibre behaviour is studied and analysed'. An analytical solution is obtained for the case of a fibre in a uniform crossflow of brine of uniform concentration and uniform pressure. A numerical procedure, making use of this analytical solution, is developed to solve the more general problem of detailed bundle behaviour. The experimental data are analysed using a computer program based on the numerical procedure presented in Chapter 5. Experiments were carried out on small B-9 and B-10 hollow fibre membranes. The performances of the fibre bundles, including the.measurements of the closed end bore pressures were investigated for two feeds, pure water and sodiun chloride solution, under various ranges of operating conditions. From the resulting membrane performances, in both modules, it was seen that: 1. The water permeability constant, k^ increased with increasing temperature. The k- was pratically independent of applied pressure at feed temperature of 20°C and 25°C However, the k.. tended to decrease with increasing pressure at 30°C. 2. The salt permeability constant, k2, increased with increasing temperature and pressure in the experiments with B-9 module. The salt permeability constant, k? of the B-10 modules was found to be highly dependent upon the PT-B post-treatment history. A computer program (FD), assuming a fixed fibre geometery was used to determine the values of- k-, k~ and the closed end fibre bore pressure. However, these theoretically precited values of fibre bore pressures were found to be significantly lower than the experimentally measured values of fibre bore pressures. A second program (VID) used the overall bundle performances togeth-er with the measured values of bore pressures to predict the effective bore diameters, Dia, and modified membrane constants ^1pff an
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