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:: Section 2ImpactionFigure 1 shows the schematic of an impaction plate. The gas stream passes through a narrow nozzle at a high speed. When an obstacle (i.e. impaction plate in this case) is in front of the stream, the stream can easily make a turn to avoid the obstacle. Particles in the stream however, may have a different fate. Larger particles, due to their higher inertia, won't be able to follow the gas stream well, and therefore they will deviate from the gas stream, and they will impact on the plate.
Figure 1: The schematics of an impaction nozzle and an impaction plate. |