It is known that:
*larger particles (particle size dp > 4 micron) will deposit on internal surfaces quickly under the influence of gravity,
*particles which are less than 2 micron may become aerosol particles and remain suspended in the air and the occupied spaces in which particle molecular diffusion and air movement dominate the particles’ movement and the gravitational force becomes less important.
*Particles which are between 2 and 4 micron may settle down on the interior surfaces or remain suspended in the air, which is mainly influenced by both the airflow pattern and gravity.
Particles which are suspended in the air have a significant influence on human health and the indoor air quality (IAQ). The IAQ in multi-zone buildings has been given much attention in recent years. It is necessary to investigate the airflow pattern and indoor aerosol particle distribution in ventilated multi-zone buildings.
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