A1 Refereed original research article in a scientific journal

One-step method for measuring the effect of humidity on powder resistivity




AuthorsMurtomaa M, Mäkilä E, Salonen J

PublisherELSEVIER SCIENCE BV

Publication year2013

JournalJournal of Electrostatics

Journal name in sourceJournal of Electrostatics

Journal acronymJ ELECTROSTAT

Number in series2

Volume71

Issue2

First page 159

Last page164

Number of pages6

ISSN0304-3886

DOIhttps://doi.org/10.1016/j.elstat.2013.01.010(external)

Web address http://www.scopus.com/inward/record.url?eid=2-s2.0-84874359884∂nerID=40&md5=6bf1d2410fce9b82554bb73e1465e994


Abstract
We present a method for measuring powder resistivity as a function of moisture using a one-step process. The developed new resistivity cell consists of narrow horizontal electrode surrounded by a grounded guard electrode and simultaneous measurement of humidity within the powder bed. The system was modeled using computer simulations. As an example, resistivities of three different lactoses, wheat flour and quartz are presented. Resistivity was found to decrease several orders of magnitude between 10 RH% and 90 RH%. Simulated results showed that if no guard plate is used, measurement errors caused by humidity gradient are of order of magnitude. (C) 2013 Elsevier B.V. All rights reserved.



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