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Initial CFD investigation of an MR fluid in a bicycle ergometer

Kelson, Neil A., Doocey, Jacinta M., Rogers, Adam A., & Brown, Richard J. (2006) Initial CFD investigation of an MR fluid in a bicycle ergometer. In The 13th Biennial Computational Techniques and Applications Conference, 2-5 July 2006, James Cook University, Townsville, Queensland.

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Abstract

A bicycle ergometer is a scientific device used by exercise physiologists which attempts to mimic on-road cycling characteristics such as foot technique, EMG activity, VO2, VCO2 and rider cardiology in a laboratory environment. Presently there are no known useful scientific ergometers that mimic these characteristics and are able to provide a satisfactory controlled resistance that is independent of speed. Previous research has suggested the use of a Magneto-Rheological (MR) Fluid as part of the ergometer design, as when used in a rotary brake application it is able to be controlled electronically to increase resistance instantly and independent of speed. In the target application, MR fluids are subject to immense tribological wear and temperature during viscous shearing, and will eventually show some degree of deterioration which is usually manifested as an increase in off-state viscosity. It is not known exactly how the fluid fails, however the amount of deterioration is related to the shear rate, temperature and duration and directly related to the power dissipation. Currently, there is very little literature that investigates the flow and thermal characteristics of MR fluid tribology using CFD. In this paper, we present initial work that aims to improve understanding of MR fluid wear via CFD modelling using Fluent, and results from the model are compared with those obtained from a experimental test rig of an MR fluid-based bicycle ergometer.

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ID Code: 26481
Item Type: Conference Item (Presentation)
Additional Information: The contents of this conference presentation can be freely accessed online via the conference web page (see Official URL).
Additional URLs:
Keywords: microrheological fluid, Computational Fluid Dynamics, ergometer
Divisions: Current > QUT Faculties and Divisions > Division of Technology, Information and Learning Support
Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Research Centres > High Performance Computing and Research Support
Deposited On: 27 Jul 2009 09:43
Last Modified: 18 Mar 2011 12:24

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