ISPE Glossary of Pharmaceutical and Biotechnology Terminology

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Laminar Flow

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.

Laminar Flow

An organized flow field that can be described with streamlines. In order for laminar flow to be permissible, the viscous stresses must dominate over the fluid inertia stresses.

Laminar Flow

Publication Source: ISPE Good Practice Guide: Heating, Ventilation, and Air Conditioning (HVAC)

Publication Date: 2009

See also: Unidirectional Airflow

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