The different aspects of near-wall turbulence, frictional pressure losses, near-wall velocity and shear stress profiles caused due to various fluid flow problems during well drilling and well completion are a current area of research. This thesis experimentally and visually analyses the near-wall turbulent behaviour by evolving Particle Image Velocimetry (PIV) technique implied with medium-sized multiphase flow system in an inclined annulus of 5˚ and 10˚. Newtonian fluids as a single-phase (liquid) flow and non-Newtonian fluid as a two-phase (liquid/solid) flow. The data for both single-phase (liquid), and dual-phase (liquid/solid) is analysed in inclined concentric and different eccentric conditions with the rotating inner pipe on different Rotation per Minute (RPM).