Empirical Sherwood number and friction factor correlations are presented for electrodialysis systems with channels containing strip-type eddy promoters having various spacings. Based on the scheme developed by Sonin and lsaacson (1974), it is shown that an eddy promoter spacing of about four channel thicknesses represents an optimization from the point of view of process economics. Sample calculations for optimum operating conditions are given for typical brackish water electrodialysis processes using the optimum channel configuration. It is argued, furthermore, that with the optimum spacing, the strip-type promoters investigated here have a performance approximately equivalent to, or better than, the best of other types of eddy promotion systems which have been tested, at least in the Reynolds number range of interest in electrodialysis systems.

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