Mass-Transfer Correlation for Flow over Cylindrical Microelectrodes

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

doi:10.1021/ie00049a041

Mass-Transfer Correlation for Flow over Cylindrical Microelectrodes

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

Chemical Engineering and Materials Science

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Abstract

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 Sh_d = (0.342 ± 0.008)Re_d^1/2Sc^1/3.

Original language	English (US)
Pages (from-to)	264-267
Number of pages	4
Journal	Industrial and Engineering Chemistry Research
Volume	30
Issue number	1
DOIs	https://doi.org/10.1021/ie00049a041
State	Published - Jan 1 1991

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title = "Mass-Transfer Correlation for Flow over Cylindrical Microelectrodes",

abstract = "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.",

author = "Earl, {David J.} and Kragt, {Harlan J.} and Chris Macosko and White, {Henry S.}",

year = "1991",

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T1 - Mass-Transfer Correlation for Flow over Cylindrical Microelectrodes

AU - Earl, David J.

AU - Kragt, Harlan J.

AU - Macosko, Chris

AU - White, Henry S.

PY - 1991/1/1

Y1 - 1991/1/1

N2 - 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.

AB - 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.

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

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Mass-Transfer Correlation for Flow over Cylindrical Microelectrodes

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