Mass-Transfer Correlation for Flow over Cylindrical Microelectrodes

David J. Earl, Harlan J. Kragt, Chris Macosko, Henry S. White

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


An annular electrochemical flow cell was designed in which electrolyte flow occurred longitudinally with respect to a cylindrical platinum microelectrode. Convective mass-transfer properties of the annular cell were determined by measurement of faradaic currents corresponding to the mass- transfer-limited oxidation of ferrocyanide in water (Sc = 1390) and ferrocene in acetonitrile (Sc = 180). Measurements were made by using electrodes of 25-μm, 127-μm, and 1.0-mm diameter, by using a flow cell of 4.8-mm diameter, and at flow velocities corresponding to Reynolds numbers between 1 and 900. The generalized mass-transfer correlation, based on the electrode diameter, was determined to be Shd = (0.342 ± 0.008)Red1/2Sc1/3.

Original languageEnglish (US)
Pages (from-to)264-267
Number of pages4
JournalIndustrial and Engineering Chemistry Research
Issue number1
StatePublished - Jan 1 1991


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