In a real impactor , the nozzle flow impacts on a flat plate placed at right angle to the nozzle flow and flows radially outwards on the plate. Hence, the flow field is constant in real impactor provided the flow rate Q 1 through the nozzle is constant, whereas in a virtual impactor this is not the case. Here keeping the total flow rate Q 1 through nozzle constant, the minor flow rate Q m through collection prove can be changed by changing the major flow rate Q 2 through the vacuum pump. Hence, in virtual impactor , the effective velocity responsible for pushing the particles into the minor flow is a difference of velocities (V 1 -V 2 ) , Where V 1 and V 2 are the velocities corresponding to the nozzle flow rate and major flow rate. The experimental analysis has been done in set II in accordance with the methodology described below. Stokes number for a virtual impactir is given by: Stk= Ʈ (V 1 -V 2 )
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