13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Development of a Vibrating Wire Rheometer

17 Jun 2015, 19:02
2m
CCIS Ground Floor PCL lounge (University of Alberta)

CCIS Ground Floor PCL lounge

University of Alberta

Poster (Non-Student) / affiche (non-étudiant) Instrumentation and Measurement Physics / Physique des instruments et mesures (DIMP-DPIM) DIMP Poster Session with beer / Session d'affiches, avec bière DPIM

Speaker

Prof. John de Bruyn (The University of Western Ontario)

Description

Vibrating wire devices have been used in the past to determine the viscosity of Newtonian fluids. We are investigating the use of a vibrating wire device to measure the viscous and elastic moduli of non-Newtonian fluids. Our device consists of a small diameter tungsten wire under tension and immersed in a fluid. When a magnetic field is applied and an alternating current is passed through the wire, it vibrates at the driving frequency. The resonance frequency of the wire can be tuned by varying its length and the applied tension, giving an accessible frequency range of 600 - 6800 Hz. A dual phase lock-in amplifier is used to measure the in-phase and out-of-phase components of the voltage across the wire as a function of frequency. The Navier-Stokes equations can be solved for this system and an analytic expression can be derived relating the voltage across the wire to the physical parameters of the system, including viscosity. The viscosity of a fluid can be determined by fitting the measured voltage to this function. In this poster we discuss the design and operation of our vibrating wire rheometer and present results for a variety of Newtonian fluids and polymer solutions.

Primary authors

Cameron Hopkins (The University of Western Ontario) Prof. John de Bruyn (The University of Western Ontario)

Presentation Materials

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