Laminar flow refers to air movement in parallel layers at uniform velocity without mixing between layers. This organized airflow pattern is fundamental to cleanroom design and contamination control. Laminar flow maintains directional, consistent air movement at velocities typically between 80 and 100 feet per minute.
Technical Details
Laminar flow is achieved using low-turbulence diffusers and perforated ceilings or walls that deliver air uniformly across a room section. The Reynolds number in laminar flow is less than 2,300, indicating smooth, predictable flow patterns. Terminal HEPA filters placed in supply diffusers ensure particles are removed before air enters the work area.
Applications
Laminar flow systems are standard in ISO Class 5 and Class 6 cleanrooms used for pharmaceutical manufacturing, semiconductor production, and surgical environments. They provide superior particle control compared to turbulent airflow systems.
Practical Significance
Maintaining true laminar flow requires precise HVAC design and regular verification through smoke testing. Obstructions or improper positioning of equipment can disrupt laminar patterns and compromise product safety.