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Title: Magneto-hydrodynamics of couple stress lubricants in combined squeeze and shear in parallel annular disc viscous coupling systems
Authors: Daliri, M.
Jalali-Vahid, D.
Rahnejat, Homer
Keywords: Couple stress fluids
Hartman number
Parallel annular discs
Stokes micro-continuum theory
Rotational inertial effects
Viscous coupling systems
All-wheel-drive off-road vehicles
Issue Date: 2015
Publisher: © IMechE. Published by Sage.
Citation: DALIRI, M., JALALI-VAHID, D. and RAHNEJAT, H., 2015. Magneto-hydrodynamics of couple stress lubricants in combined squeeze and shear in parallel annular disc viscous coupling systems. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 229(5), pp. 578-596.
Abstract: This article presents predictive analysis of load-carrying capacity, tractive efficiency and response time of parallel annular discs intervened with a film of lubricant under combined shear and squeeze film motions. This configuration represents operational characteristics of viscous coupling systems. In particular, the case of viscous dampers for tractive torque generation and distribution in all-wheel-drive off road vehicles is studied. Various forms of lubricant behaviour, from idealised Newtonian to that of non-Newtonian silicone-based fluids and incompressible isothermal electrically conducting couple stress fluids, subjected to a magneto-hydrodynamic field are studied. The solution for the magneto-hydrodynamics includes combined solution of modified Reynolds equation and Stoke's micro-continuum for couple stress fluids in squeeze and shear with rotational fluid inertia, an approach not hitherto reported in the literature. It is shown that in general magneto-hydrodynamic couple stress fluids enhance the load-carrying capacity of the contact and inhibit the incidence of thin films, which can result in direct contact of surfaces. Rotational inertia decreases the load-carrying capacity, although in general the magneto-hydrodynamic fluids show better load-carrying capacity and tractive efficiency than the other alternatives. However, they exhibit a lower response time under the assumed isothermal condition. Nevertheless, the magneto-hydrodynamic fluids are best suited to applications in viscous coupling systems because of their controllability.
Description: This article was published in the Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology [© IMechE. Published by Sage] and the definitive version is available at: http://dx.doi.org/10.1177/1350650114556398
Sponsor: The authors would like to acknowledge the financial supports from Sahand University of Technology under grant of Research Fund for the Doctoral Program of Higher Education.
Version: Accepted for publication
DOI: 10.1177/1350650114556398
URI: https://dspace.lboro.ac.uk/2134/26332
Publisher Link: http://dx.doi.org/10.1177/1350650114556398
ISSN: 1350-6501
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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