Why does a real liquid not exhibit laminar flow at the inner wall of the pipe?

A real liquid does not exhibit laminar flow at the inner wall of a pipe due to the presence of viscosity and turbulence caused by interactions with the pipe surface and other layers of fluid. As the liquid flows, friction between the fluid layers and the pipe wall can induce shear stress, leading to disturbances that disrupt the orderly flow patterns characteristic of laminar flow. Additionally, any imperfections or roughness on the pipe wall can further contribute to turbulence and transition to a more chaotic flow regime. Therefore, while laminar flow can occur in ideal conditions, real liquids often experience a mix of flow patterns influenced by these factors.