TY - EJOU AU - Lin, J.R. AU - Li, P.J. AU - Hung, T.C. TI - Effects of Non-Newtonian Ferrofluids on the Performance Characteristics of Long Journal Bearings T2 - Fluid Dynamics \& Materials Processing PY - 2013 VL - 9 IS - 4 SN - 1555-2578 AB - On the basis of the Shliomis ferrofluid model (1972) together with the micro-continuum theory of Stokes (1966), the influences of non-Newtonian ferrofluids on the steady-state performance of long journal bearings have been investigated in the present paper. Analytical solutions for bearing performances are obtained from the non-Newtonian ferrofluid Reynolds-type equation. Comparing with the Newtonian non-ferrofluid case, the effects of non-Newtonian ferrofluids with applied magnetic fields provide an increase in the zero pressure-gradient angle and the load capacity, and a decrease in the friction parameter, especially for a larger non-Newtonian couple stress parameter and magnetic Langevin’s parameter. For the long journal bearing lubricated with non-Newtonian ferrofluids and operating at larger couple stress parameter and magnetic Langevin’s parameter (for example, N=0.3, ξ =50), slight variation is observed for the friction parameter, but higher bearing loads are obtained with increasing values of the volume concentration parameter. KW - long journal bearings KW - couple stress fluids KW - ferrofluids KW - magnetic fields DO - 10.3970/fdmp.2013.009.419