Collector motion affects particle capture in physical models and in wind pollination

Particle capture is important for ecological processes in aquatic and terrestrial ecosystems. The current model is based on a stationary collector where predictions about capture efficiency (η; flux of captured particles : flux of particles) are based on the collector flow environment (i.e., collector Reynolds number, Rec; inertial : viscous forces). This model does not account for the movement of collectors in nature. We examined the effect of collector motion (transverse and longitudinal to the flow) on η using a cylindrical model in the lab and the grass species, Phleum pratense, in the field. Results demonstrated that collector motion increased η (up to 400% and 20% in the lab and field, respectively) and also affected the spatial distribution of particles on collectors, especially at low Rec. The effect was greatest for collectors moving transversely at large magnitude, which encountered more particles with higher relative momentum. These results, which differ from the stationary ...