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Z. Naturforsch. 68a, 291 – 299
(2013)
doi:10.5560/ZNA.2013-0004
Effects of Non-Newtonian Rheology on Curved Circular Squeeze Films: the Rabinowitsch Fluid Model
1 Department of Mechanical Engineering, Taoyuan Innovation Institute of Technology, Jhongli, Taiwan, R.O.C.
2 Department of Mechanical and Automation Engineering, I-Shou University, Dashu, Kaohsiung, Taiwan, R.O.C.
Received June 25, 2012 / revised October 16, 2012 / published online February 6, 2013
Reprint requests to: J.-R. L.; E-mail:
jrlin@tiit.edu.tw
On the ground of the non-Newtonian Rabinowitsch fluid model, the study of Newtonian squeeze film problems of curved circular plates [P. R. K. Murti, Trans. ASME 97, 650 (1975)] is extended in this paper. According to the results, higher load capacities and longer approaching times are obtained for the curved plates lubricated with dilatant fluids, but the pseudoplastic lubricants result in reversed trends. The influences of non-Newtonian dilatant and pseudoplastic properties on the squeeze film characteristics are further emphasized for curved circular plates operating under a smaller minimum film height and a larger curved shape parameter. Numerical results of the non-Newtonian load capacity are also provided for specific values of the curved shape parameter, the nonlinear parameter, and the minimum film height.
Key words: Non-Newtonian Fluids; Rabinowitsch Fluid Model; Squeeze Films; Curved Circular Plates.