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Encounter efficiency (ε) as a function of collector Reynolds number (Rec) for 3 values of rp. Black lines are numerical results from this study (solid: Rec ≤ 0.1; broken: 0.1 ≤ Rec ≤ 50). Blue lines are the semianalytical derivations of ref. 20 (solid: Rec ≤ 0.1; dotted: extrapolated to 0.1 ≤ Rec ≤ 4). Note that the low-Re formulation predicts exponentially increasing encounter rates above its defined Reynolds number range (Re ≤ 0.1). Points are means ± SE. of data from ref. 9.
