Rates of mass transfer to patch electrodes in disturbed flows using oxygen reduction under limiting current conditions

Kear, Gareth, Bremhorst, Klaus, Coles, Shane and Huang, Shèng-Huèi (2008) Rates of mass transfer to patch electrodes in disturbed flows using oxygen reduction under limiting current conditions. Corrosion Science, 50 6: 1789-1795. doi:10.1016/j.corsci.2008.04.001


Author Kear, Gareth
Bremhorst, Klaus
Coles, Shane
Huang, Shèng-Huèi
Title Rates of mass transfer to patch electrodes in disturbed flows using oxygen reduction under limiting current conditions
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2008-06-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.corsci.2008.04.001
Open Access Status DOI
Volume 50
Issue 6
Start page 1789
End page 1795
Total pages 6
Editor G. T. Burstein
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
0913 Mechanical Engineering
970102 Expanding Knowledge in the Physical Sciences
Abstract The cases of a sudden pipe expansion and a sudden pipe contraction are simulated within a flow loop-based test section designed to approximate disturbed conduit flow. Mass transfer rates to patch electrodes at selected positions within the test section have been measured using a limiting current methodology applied to oxygen reduction at copper in 3.5% wt./vol. NaCl. Using both large-scale polarisation linear sweep voltammetry and a potential step current transient technique with hydrodynamic steps, absolute and relative rates of oxygen mass transfer have been examined as a function of Reynolds number and location within the test section. The highest rates of oxygen transfer were observed both within the high velocity area of the test section and close to known regions of flow disturbance. Under the flow conditions used, patch electrode mass transfer relates to wall shear stress, which allowed areas of high mean and high fluctuating wall shear stress to be identified.
Keyword Oxygen reduction
Mass transfer
Wall shear stress
Disturbed flow
Flow accelerated corrosion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Thu, 09 Apr 2009, 20:30:51 EST by Rose Clements on behalf of School of Mechanical and Mining Engineering