Accession Number : AD0679416

Title :   MASS TRANSFER COEFFICIENTS FOR USE IN REVERSE OSMOSIS PROCESS DESIGN,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY

Personal Author(s) : Kimura,Shoji ; Sourirajan,S.

Report Date : 25 SEP 1967

Pagination or Media Count : 10

Abstract : Analytical expressions are given for predicting concentration polarization effects in reverse osmosis using feed solutions such as sodium chloride-water. The cases considered are laminar and turbulent flow between flat parallel or in tubular porous cellulose acetate membranes for experimental conditions defined by the dimensionless parameters. Analysis of the characteristics of two typical films shows that the variations of average solute separation, fractional water withdrawal, and boundary concentration with X obtained by the solution of the partial differential equations are in good agreement with those given by the trial and error solution of the basic transport equations using local or average mass transfer coefficients obtained from the above correlations. Using the experimental results of Shaw et al. and the Leveque solution, the turbulent flow case has been analyzed. On the basis of these analyses, explicit expressions for calculating local and average mass transfer coefficients are given for both laminar and turbulent flow between flat parallel and in tubular membranes. (Author)

Descriptors :   (*DESALINATION, *OSMOSIS), (*CELLULOSE ACETATES, DESALINATION), MATHEMATICAL ANALYSIS, MASS TRANSFER, LAMINAR FLOW, TURBULENCE, SODIUM CHLORIDE, WATER, POLARIZATION, CANADA

Subject Categories : Physical Chemistry
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE