Talk about the airflow speed regulation in purification engineering
Talk about the airflow speed regulation in purification engineering
Purification engineering refers to controlling the cleanliness and temperature and humidity of the atmosphere that products (such as silicon chips, etc.) come into contact with, so that the products can be produced and manufactured in a good environmental space.
Airflow velocity refers to the airflow velocity in the purification project clean room modular. Since it mainly relies on the dilution of air to reduce the degree of indoor pollution, the concept of the number of air changes is mainly used instead of the concept of velocity directly. There are also the following requirements;
(1) The airflow speed at the outlet of the air outlet should not be too large. Compared with a simple air-conditioned clean room modular, the faster the speed decay is required, the larger the diffusion angle is.
(2) The velocity of the airflow over the horizontal plane (for example, the recirculation velocity during side feeding) should not be too large, so as not to blow surface particles back into the airflow and cause re-contamination. Generally, the velocity should not be greater than 0.2m/s.
For the parallel flow purification engineering clean room modular, the speed on the cross-section is a very important indicator because the extrusion of the piston of the airflow is mainly used to eliminate the dyeing.
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In clean area management and quality control, laminar flow interference testing has received much attention, and whether it is only applicable to Class A laminar flow remains to be considered.