On the gap error in parallel plate rheometry that arises from the presence of air when zeroing the gap

Davies, Georgina A. and Stokes, Jason R. (2005) On the gap error in parallel plate rheometry that arises from the presence of air when zeroing the gap. Journal of Rheology, 49 4: 919-922. doi:10.1122/1.1942501


Author Davies, Georgina A.
Stokes, Jason R.
Title On the gap error in parallel plate rheometry that arises from the presence of air when zeroing the gap
Journal name Journal of Rheology   Check publisher's open access policy
ISSN 0148-6055
Publication date 2005-07
Sub-type Article (original research)
DOI 10.1122/1.1942501
Volume 49
Issue 4
Start page 919
End page 922
Total pages 3
Place of publication New York
Publisher American Institute of Physics
Language eng
Subject 09 Engineering
Abstract When zeroing the gap between two parallel plates, the squeeze flow of air results in a detectable normal force at a finite height that is misinterpreted in rheometry as an indicator for the zero gap position. This leads to a substantial gap error using well-aligned parallel plates that is accurately predicted using Stefan's equation for squeeze flow. Minimizing or accounting for this error enables accurate rheological measurements to be performed in torsional flow using the parallel plate geometry at narrow gap heights, thus allowing shear rates of over 10(5) s(-1) to be achieved. (C) 2005 The Society of Rheology.
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
 
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Created: Wed, 01 Jul 2009, 16:03:57 EST