Changing the size of narrowly distributed aerosols:     The size of narrowly distributed aerosols generated in the aerosols generator can be      controlled by controlling solution concentration (C c ) . , Minor flow rate (Q m )    and total flow rate (Q 1 ) .         Effect of change in solution concentration:     The size of aerosols with narrow size distribution can be varied by changing the concentration      of liquid solution according to the relation.     C c = V p /V d = d p 3 /d d 3     Where           C c = Solution concentration        V p = Volume of solute from which final particles are formed,     V d = Volume of solvent      d p = Diameter of particle and     d d = Diameter of droplet     We know d d   because it is the cut off diameter of droplets in the virtual impactor . Forconstant      flow rate through the virtual impactor, the cut off diameter , d d , in the virtual impactor is      a...
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