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Particle induced surface erosion – Tumbling and direct impact; a high-speed electrochemical, acoustic and visual study

Particle induced surface erosion – Tumbling and direct impact; a high-speed electrochemical, acoustic and visual study
Particle induced surface erosion – Tumbling and direct impact; a high-speed electrochemical, acoustic and visual study
A technique that monitors the impedance of a 250 µm diameter aluminium electrode as a function of time with a 2 µs resolution as sand particles (‘slurry erosion’) are impinged on the solid/liquid interface is reported using a submerged jet. The detection of individual particles as they approach an electrode, before any erosion/corrosion was registered, is demonstrated. This study shows that at least two types of erosion mechanisms are possible; direct or ‘primary’ impact and tumbling or ‘scrape’ events. The primary impact events are correlated to the acoustic emission from the environment which is shown to be significant for these events, whereas scrape events appear to produce far weaker acoustic emission signatures under the conditions employed. The velocities of the particles are reported and are of the order of 6–8 m s−1 at the jet mouth. However, high-speed imaging of the particles as they strike the substrate indicates a significant deceleration prior to impact and an order of magnitude reduction in kinetic energy compared to that as it exits the jet.
electrochemistry, solid particle erosion, Impact, Acoustic emission
0043-1648
147-153
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Barber, Jennifer, Lucy
3c4baae0-bf69-4e0e-a754-36ea379dddfe
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Barber, Jennifer, Lucy
3c4baae0-bf69-4e0e-a754-36ea379dddfe

Birkin, Peter R. and Barber, Jennifer, Lucy (2019) Particle induced surface erosion – Tumbling and direct impact; a high-speed electrochemical, acoustic and visual study. Wear, 428-429, 147-153. (doi:10.1016/j.wear.2019.02.011).

Record type: Article

Abstract

A technique that monitors the impedance of a 250 µm diameter aluminium electrode as a function of time with a 2 µs resolution as sand particles (‘slurry erosion’) are impinged on the solid/liquid interface is reported using a submerged jet. The detection of individual particles as they approach an electrode, before any erosion/corrosion was registered, is demonstrated. This study shows that at least two types of erosion mechanisms are possible; direct or ‘primary’ impact and tumbling or ‘scrape’ events. The primary impact events are correlated to the acoustic emission from the environment which is shown to be significant for these events, whereas scrape events appear to produce far weaker acoustic emission signatures under the conditions employed. The velocities of the particles are reported and are of the order of 6–8 m s−1 at the jet mouth. However, high-speed imaging of the particles as they strike the substrate indicates a significant deceleration prior to impact and an order of magnitude reduction in kinetic energy compared to that as it exits the jet.

Text
Particle impact Birkin and Barber Wear final for pure - Accepted Manuscript
Restricted to Repository staff only until 7 February 2020.
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Accepted/In Press date: 6 February 2019
e-pub ahead of print date: 7 February 2019
Published date: 15 June 2019
Keywords: electrochemistry, solid particle erosion, Impact, Acoustic emission

Identifiers

Local EPrints ID: 429068
URI: https://eprints.soton.ac.uk/id/eprint/429068
ISSN: 0043-1648
PURE UUID: d26f9893-bbd9-4e84-ba27-56669cce3ea4
ORCID for Peter R. Birkin: ORCID iD orcid.org/0000-0002-6656-4074

Catalogue record

Date deposited: 20 Mar 2019 17:30
Last modified: 11 May 2019 00:36

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Contributors

Author: Peter R. Birkin ORCID iD
Author: Jennifer, Lucy Barber

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