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The Effect of Couple Stress Fluid on the Squeeze Film Lubrication in Human Synovial H ip Joint

Enas Yahya

In this paper a study of the squeeze film characteristics in the synovial human hip joint is presented, on the basis of the Stokes micro continuum fluid theory. To take into account the couple stress effects due to the lubricant containing additives or suspended particles , the modified Reynold,s equation governing the fluid film pressure was derived. The modified Reynolds equation's is solved analytically, and closed form expressions for the squeeze film pressure, and load carry capacity was presented. The influence couple stresses on the squeeze film characteristics was discussed. It has been found that the effect of couple stresses increased the pressure distribution, load carry capacity and squeeze film time, and decreased the friction coefficient, as compared to the Newtonian lubricant case.