Concentration polarization in a reverse osmosis test cell

✍ Scribed by G. Jonsson; C.E. Boesen

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 560 KB
• Volume: 21
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/s0011-9164(00)84104-1

✦ Synopsis

The reverse osmosis cell is a parallel plate test channel with the membrane on one side and five permeate outlets in series. Mass transfer .coefficients have been measured by three different techniques in both laminar and turbulent flow. These give concurrent measurements, which show that the transfer from laminar to turbulent flow occurs in the region Re = 1000-2500. The results can be represented by the equation Sh = A -Re"-so -SC'.'~, where the constant A is independent of the solute mobility and membrane retention, but varies with the channel height and the distance from the inlet zone. SYMBOLS Ac -D -DA -Schmidt number Sherwood number circulation velocity dimensionless coordinate, J,fLh/6UD2 l mated at the Fifth International Conference on Fresh Water from the Sea, Alghero. May 16-20. 1976.