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Main Title: Contact electrification in aerosolized monodispersed silica microspheres quantified using laser based velocimetry
Author(s): Alois, Stefano
Iversen, Jens Jacob
Merrison, Jonathan
Sesterhenn, Jörn
Type: Article
Language Code: en
Abstract: The contact electrification of aerosolized micro particles has been studied using a novel technique involving laser velocimetry. This has allowed the simultaneous determination of size and electrical charge of individual silica microspheres (in the range 1 – 8 µm). Interestingly the particles interacting with the injector tube have been seen to become electrified with a relatively narrow range of surface charge concentration of around Q/4πr² ~ −100 e⁻/µm² (~ −0.02mC/m²) for all particle sizes. Several combinations of aerosol particle and injector tube composition were also investigated, some of which led to positive particle electrification and all of which resulted in similar values of measured surface charge concentration. The electrification was not seen to be strongly affected by gas composition and is in reasonable agreement with the expected maximum surface charge observed in previous experiments (< 0.1mC/m²). Possible explanations for this effect are discussed, including the possibility of field emission at the contact site. In the future this technique is intended also to be applied to particle-particle induced contact electrification and its material dependence.
Issue Date: Apr-2017
Date Available: 28-May-2018
DDC Class: 670 Industrielle Fertigung
Subject(s): contact electrification
solid aerosol
laser velocimetry
Journal Title: Journal of aerosol science
Publisher: Elsevier
Publisher Place: Amsterdam [u.a.]
Volume: 106
Publisher DOI: 10.1016/j.jaerosci.2016.12.003
Page Start: 1
Page End: 10
ISSN: 0021-8502
Appears in Collections:FG Numerische Fluiddynamik » Publications

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