Elastohydrodynamic Lubrication Analysis Of Water-based Ferrofluid Lubricated Journal Bearing

The Elastohydrodynamic Lubrication(EHL) model of infinite line contact offerrofluid lubricated journal bearing is established in this article. Based on themulti-grid method, starting from the isothermal EHL analysis, thermal effect,non-newtonian effect, transient effect and surface roughness are taken into accountstep by step, and complete numerical solutions of ferrofluid lubricated journal bearingwith different effect factors have been obtained.Firstly, the isothermal EHL analysis of ferrofluid lubricated bearing was carriedout. The EHL performances under different carrier fluids were discussed; The filmthickness, pressure at the inlet and pressure peak under different viscocities werestudied; The film thickness, pressure at the inlet and pressure peak of water-basedferrofluid under different velocities and loads were discussed.Secondly, the thermal EHL results of water-based ferrofluid lubricated bearingwas abtained. The complete numerical solutions of water-based ferrofluid lubricatedbearing under isothermal and thermal conditions were compared; The film thickness,pressure at the inlet and pressure peak of water-based ferrofluid under differentmagnetic particle volume factions, slip ratios and curvature radius were discussed.Thirdly, the non-newtonian thermal EHL analysis of water-based ferrofluidlubricated bearing was researched. The EHL performances under different flowindexes, magnetic inductions and single rough peak were discussed, and the pressure,film thickness under different rough amplitudes and wavelengths were researched.At last, the non-newtonian transient thermal EHL analysis of water-basedferrofluid lubricated bearing was studied. The EHL performances under transienteffects in a period were studied and the pressure and film thickness dynamic effectsunder different amplitudes and periods were discussed; Considering the influence ofcontinuous roughness on the bearing surface, the EHL performances under differentamplitudes and wavelengths were researched; Considering the influence of continuousroughness on the bearing and shaft surfaces synthetically, the non-newtonian transient micro-thermal EHL analysis of water-based ferrofluid lubricated bearing were carriedout, the pressure and film thickness distributions under different phases were studied.