Abstract
The dynamic characteristics of finite-width journal bearings lubricated with a micropolar fluid are analysed by the linear stability theory. The stiffness and damping coefficients and the critical stability parameter of the journal bearings with micropolar and newtonian fluids for B/ D = 1.0 and B/ D = π/10 are obtained and presented graphically. For the micropolar fluid, the dominating normal stiffness coefficient is larger, while the dominating normal damping coefficient is smaller; and the stable region of the journal is more narrow. The feature of increasing effective viscosity and load capacity for the micropolar fluid results in lower limit values of the Sommerfeld number for completely stable operation.
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