Actually, I want to know about the parameters upon which the cut-off size of the aerosol particle is depended for a virtual impactor. Is the flow rate one of the parameter or not?
You will find all necessary equations in the linked article. Yes. Flow rate is one of the parameters.
Article Design of a Multistage Virtual Impactor
The equation to calculate the cut-off diameter of a virtual impactor is the same as for a jet-to-plate impactor, except that the impaction parameter of that equation is about 0.8 for the virtual case, as opposed to about 0.5 for the jet-to-plate case. Jet velocity is one of the parameters and therefore flow rate.
Your question did not specifically indicate if your interest was in dichotomous or multistage virtual impactors so I added a dichotomous virtual impactor reference for your information.
http://www.tandfonline.com/doi/pdf/10.1080/02786828808959205?needAccess=true
The Loo and Cork paper also has a nice discussion on particle losses in virtual impactor systems which can be significant.
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