Comparative Study of Ferrofluid Lubricated Various Designed Slider Bearings Considering Rotation of Magnetic Particles and Squeeze Velocity

摘要

The aim of the present paper is to make a comparative mathematical study ofthe effects of ferrofluid lubricant on various designed slider bearings (that is, slider bearings having inclined pad (plate or surface) stator, exponential pad stator, secant pad stator, convex pad stator and parallel pad stator) considering rotation of the magnetic particles and their magnetic moments under a constant transverse magnetic field. The comparative study of dimensionless load carrying capacity ( ) is made including the effect of squeeze velocity , which appears when the upper plate approaches to lower one normally. The Reynolds’s type equation is derived for the above bearing designs in general and expressions for dimensionless pressure and load carrying capacity are obtained. Dimensionless load carrying capacity remains almost constant with the increase of Langevin’s parameter whereas it has an increasing tendency with the increase of volume concentration of the solid phase for all bearings. Moreover, this ferrofluid model supports maximum for convex pad stator slider bearing when . When , the model supports maximum to parallel pad stator slider bearing. Also, the squeeze velocity has significant effect on the bearing design system. In the absence of squeeze velocity, the model does not support any load to parallel pad stator slider bearing. Among all the bearing designs, this ferrofluid model supports minimum for secant pad stator slider bearings in all cases; that is, whether or It should be noted that a constant magnetic field does not enhance load carrying capacity in Rosensweig’s ferrofluid flow model whereas it does in the Shliomis model.