:: Section 9
IV. Calculation of Cutoff Size
Once Stk50 is available, we can calculate the cutoff size as:
Since Cc is a function of dp, dp50 cannot be obtained conveniently. Iteration is needed. i.e. assume a particle size, calculate its Cc, and compare the values on both sides of the equation. Repeat until both sides are equal.
Now, try some jet diameters and flow rates to design your impactor, and compare the cutoff sizes: