Magnetic Damping Effects in Forced-Oscillation Vibrating-Wire Viscometers

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Title Magnetic Damping Effects in Forced-Oscillation Vibrating-Wire Viscometers
Author Woodfield, Peter; Seagar, Andrew; Hall, Wayne
Journal Name International Journal of Thermophysics
Year Published 2012
Place of publication United States
Publisher Springer
Abstract Vibrating wire viscometers rely on the principle that the viscosity of the fluid surrounding the wire provides the dominant damping action on the motion of the wire. However, some residual damping is always present due to other effects such as internal friction of the wire (anelastic relaxation), losses through the wire supports, and magnetic damping. Magnetic damping is a physical mechanism that has received relatively less attention than internal friction in the context of viscometers. The phenomenon arises because the current induced by the motion of the wire contributes to the magnetic field in such a way as to oppose its own motion. For a test circuit using a 40 μmdiameter tungstenwire in a 0.3Tmagnetic field, surprisingly, the effect of magnetic damping was found to be of a similar order of magnitude to other non-viscous damping effects. The effect can be accounted for by including the internal impedance of the oscillating voltage source in themodel and it disappears completely for a perfect oscillating current source.
Peer Reviewed Yes
Published Yes
Alternative URI
Volume 33
Issue Number 2
Page from 259
Page to 278
ISSN 1572-9567
Date Accessioned 2012-02-13; 2012-09-20T21:53:55Z
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Mechanical Engineering
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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