Describes the fluid flow pattern. At low velocity, and low Reynolds numbers, flow streams tend to be parallel and well-organized. The fluid speed at the center of the pipe is much greater than near the pipe wall.
Non-turbulent fluid flow is usually considered laminar if the Reynolds number is less than 2000 in a pipe. Depending upon many possible varying conditions, the flow may be laminar at a Reynolds number as low as 1,200 or as high as 40,000; however, such conditions are not experienced in normal practice. In the pharmaceutical industry, this term incorrectly refers to the air discharge of a clean air bench or wall.
Slow, smooth flow, with each drop of water traveling a smooth path parallel to its neighboring drops. Laminar flow is characteristic of low velocities, and particles of SEDIMENT in the flow zones are moved by rolling or SALTATION.
Laminar flow of thermoplastic resins in a mold is accomplished by solidification of the layer in contact with the mold surface that acts as an insulating shell through which molten material flows to fill the remainder of the cavity.
State of fluid flow, where the particles move along parallel, ordered paths. Results in low friction on submerged surfaces, but has problems to follow retreating shapes (e.g. fuselage tails, airfoil behind location of maximum thickness). see also: Turbulent Flow.
Streamlined flow with no turbulence. It is a filtration system used through virtually all clean room processing operations to control airflow and velocity at workstations within the fab. The “path” the airflow takes is optimized to keep airborne particles from coming in contact with the wafers.
Laminar flow of thermoplastic resins in a mould is accompanied by solidification of the layer in contact with the mould surface that acts as an insulating tube through which material flows to fill the remainder of the cavity. This type of flow is essential to duplication of the mould surface.
(Also called sheet flow, streamline flow.) A flow regime in which fluid motion is smooth and orderly, and in which adjacent layers or laminas slip past each other with little mixing between them. Exchange of material across laminar layers occurs by molecular diffusion, a process about 106 times less effective than turbulence. Laminar flow can be easily predicted as velocity increases at a steady rate from a boundary. This contrasts with the chaotic and random nature of turbulent flow. Laminar flow is not a common occurrence in the statically neutral and unstable atmosphere and is confined to a very thin layer (1 mm) adjacent to very smooth surfaces such as snow and ice. However, in strongly statically stable regions such as the the nocturnal boundary layer, the Richardson number can be large enough that turbulence is suppressed, and the flow is laminar over a layer many tens of meters thick.
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, and pressure and velocity independence from time. It is the opposite of turbulent flow.