Crossflows are formed, which interfere with the main flow and thus lead to the formation of vortices. Animation: Laminar and turbulent flow in a pipeĪt high flow speeds, however, the inertial forces of the fluid particles are so great that the disturbances can no longer be compensated for by the cohesion forces. However, these disturbances can be compensated to a certain degree by a relatively strong internal cohesion of the fluid, so that the flow remains laminar.
The turbulent flow is caused by disturbances in the well-ordered flow, which are always present.
In this case one speaks of a turbulent flow. Streamlines are imaginary flow paths on which massless particles would move in a fluid! Figure: Pathlines in a laminar and a turbulent flowĪt high flow speeds, however, turbulence occurs in fluids, so that laminar flow no longer occurs. These imaginary flow paths are also called streamlines. If one imagines in thought massless particles that one introduces into such a flow, then these would move along straight paths with the flow. Such a layered flow is also called laminar flow. The definition of viscosity implies that the motion of the fluid can be divided into individual layers that shift against each other. whether it is an alminar or turbulent flow. The Reynolds number is a dimensionless similarity parameter for describing a forced flow, e.g.
