For a given fractional water recovery in RO desalination, simple analytical design equations have been developed to predict the channel length of a spiral-wound membrane module for turbulent as well as laminar flow in the brine Channels with spacers. A simple analytical expression to estimate the averaged permeate solute concentration has also been developed. The predicted dimensionless channel length and the averaged permeate solute concentration are quite close to the numerical results available in the tables of Ohya and Sourirajan except when membrane solute rejection Is low and the fractional water recbvdry is high, These design equations predict quite well the fractional water recovery and permeate solute concentrations measured by Ohya and Taniguchi with a ROGA-4000 spiral-wound module. The design equatidns for turbulent mixing conditions are valid for (N1rVl/k|)≤0.2, while those for chopped laminar flow concentration polarizatlqn conditions are valid for (N1rV1/k|).
|Original language||English (US)|
|Number of pages||11|
|Journal||Industrial and Engineering Chemistry Process Design and Development|
|State||Published - Jul 1 1982|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering