Performance Analysis of Mechanical Seal with Surface Texture Under Non-Newtonian Fluid Lubrication
In order to study the influence of the non-Newtonian rheological properties of the lubricating medium on the performance of the surface textured end-face mechanical seal,a modified Reynolds governing equation considering liquid film cavitation and non-Newtonian fluid effect was established.The steady-state film pressure characteristics,pumping backflow characteristics and load-carrying performance of the mechanical seal end face under different power-law indexes of textured dimples with different shapes such as ellipse,diamond,circle and square were discussed.The results show that with the increase of the power-law index,the thickening rheological properties of the lubricating medium increase the max-imum pressure peak and cavitation area of liquid films with different textures.Compared with the circular and square tex-tured dimples,the diamond and elliptical textured dimples have better pumping effect,and the inclination angle can be ad-justed to freely control leakage and reverse transport,but the bearing capacity is weaker.The pumping rates of the four tex-tures at high power-law indexes are improved,the bearing capacity of circular and square textured dimples is slightly in-creased,while the bearing capacity of diamond and elliptical textured dimples is significantly reduced.
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