Why does adhesion speed up when in centre of pipes rather than the edges?

Adhesion speeds up in the center of pipes because the fluid flow is typically laminar and experiences less friction with the pipe walls compared to the edges. In the center, the fluid particles are less influenced by the resistance caused by the viscosity of the fluid adjacent to the pipe walls, allowing them to move more freely. This results in a higher velocity in the center region, enhancing the overall adhesion and transport of particles or solutes through the fluid.