Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ?
A. [(DP/18). (ρs – ρ/μ)] ω2r
B. [(DP2/18). (ρs – ρ/μ)] ω2r
C. [(DP/18). (ρs – ρ/μ)] ω2r2
D. [(DP2/18). (ρs – ρ/μ)] ω2r