Laminar flow, sometimes known as streamline flow, occurs when a fluid flows in parallel layers, with no disruption between the layers. In fluid dynamics, laminar flow is a flow regime characterized by high momentum diffusion, low momentum convection, pressure and velocity independent from time. It is the opposite of turbulent flow. In nonscientific terms laminar flow is "smooth," while turbulent flow is "rough."
This is a fluid motion demonstration by the Physics Department at the University of New Mexico. Comments at both YouTube and Videosift noted that the physicist had trouble counting five turns, but the brightest scientists I know have trouble matching their socks. Push play or go to You Tube. -via Videosift