Abstract

The effect of air supply and air exhaust locations on the efficiency of restraining particles from entering the laboratory and the efficiency of particle removal from the laboratory were investigated by simulating the flow conditions, accompanied by a Lagrangian particle-tracking method to calculate the trajectories of the particles in the laboratory. Three cases with air supplied from different locations in the laboratory were used to investigate the restraint and removal effects in the study. The results indicate that for the case with air supplied from the air supply located on the ceiling near the door, the efficiency of restraining particles from entering the laboratory is the best among the three cases. However, for the particle removal efficiency, the case with the air supplied from the air supply located on the ceiling in the center of the laboratory possesses the best removal performance. For the case with air supplied from the air supply located on the ceiling far away from the door, the particle restraint and removal efficiencies are not obvious. By tracing and calculating the trajectories of micro-particles in time, the particle restraint and removal effects can be explicitly indicated by calculating the amount of particles that enter or leave the laboratory.

Key words: Particle, air supply, air exhaust, Lagrangian, restraint, removal effects.