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Zeitschrift für Naturforschung A Contents Vol. 66a (2011)

Z. Naturforsch. 66a, 512 – 518 (2011)

doi:10.5560/ZNA.2011-0009

Squeeze Film Problems of Long Partial Journal Bearings for Non-Newtonian Couple Stress Fluids with Pressure-Dependent Viscosity

Jaw-Ren Lin¹, Li-Ming Chu², Chi-Ren Hung³, and Rong-Fang Lu³

¹Department of Mechanical Engineering, Nanya Institute of Technology, P.O. Box 324-22-59, Jhongli, Taiwan, R.O.C.

²Department of Mechanical and automation Engineering, I-Shou University, Dashu, Kaohsiung, Taiwan, R.O.C.

³Department of Mechanical Engineering, Nanya Institute of Technology, No. 414, Sec. 3, Jhongshan E. Rd., Jhongli, 320, Taiwan, R.O.C.

Received February 1, 2011 / revised April 13, 2011

Reprint requests to: J.-R. L.; E-mail: jrlin@nanya.edu.tw

According to the experimental work of C. Barus in Am. J. Sci. 45, 87 (1893)  [], the dependency of liquid viscosity on pressure is exponential. Therefore, we extend the study of squeeze film problems of long partial journal bearings for Stokes non-Newtonian couple stress fluids by considering the pressure-dependent viscosity in the present paper. Through a small perturbation technique, we derive a first-order closed-form solution for the film pressure, the load capacity, and the response time of partial-bearing squeeze films. It is also found that the non-Newtonian couple-stress partial bearings with pressure-dependent viscosity provide better squeeze-film characteristics than those of the bearing with constant-viscosity situation.

Key words: Partial Bearings; Pressure-Dependent Viscosity; Non-Newtonian Fluids; Squeeze Films.

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