Investigation of Combined Effects of Couple Stress Piezo-Viscose Lubricant and surface roughness on the squeeze film characteristics of Conical Plates

The present study investigates the combined effects of piezo-viscous couple stress fluid with surface roughness on the performance of squeezed film between conical plates. According to Christensen's theory, there are two types of one-dimensional roughness structures; Such as longitudinal roughness patterns and transverse roughness patterns are considered in the desired geometry. For these two types of roughness patterns, a stochastic Reynolds equation is extracted. Using the proportion technique, an approximate analytical solution is obtained for the average lubricant film pressure, load carrying capacity and compressed film response time. According to the results, it turned out that using of piezo-viscose couple stress fluid as a lubricant and considering the transvers roughness effects of squeezed film profile surfaces; the pressure distribution along the lubricant film, load carrying capacity, and access time increase relative to the Newtonian fluid state at constant viscosity. While the effects of longitudinal roughness decrease the properties of the squeeze film compared to Newtonian fluid.