Reverse osmosis complete-mixing model

Soltanieh, M., and Gill, W. N. (1984). An experimental study of the complete mixing model for radial flow hollow fiber reverse osmosis systems. Desalination, 49, 57-88. 

Figure 13.10-1. Process flow for complete-mixing model for reverse osmosis.

Performance of a Complete-Mixing Model for Reverse Osmosis. Use the same... 

The cross-flow model for reverse osmosis is similar to that for gas separation by membranes discussed in Section 13.6. Because of the small solute concentration, the permeate side acts as if completely mixed. Hence, even if the module is designed for countercurrent or cocurrent flow, the cross-flow model is valid. This is discussed in detail elsewhere (HI). 

The physical picture of a reverse osmosis membrane illustrated in Figure 6.3.29b is sometimes identified as the sieve transport model one section of the membrane (fractional area Et] has pores that are completely open, i.e. nonrejecting, while the rest of the membrane (fractional area (1 — j,)) has complete rejection of the solute. However, variations in this model arise depending on the extent of solute mixing downstream of the membrane... 

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