The effects of collector motion on particle capture: Lab studies and wind pollination in the field

Gao, Dori
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University of Guelph

Particle capture is important for many aquatic and terrestrial processes including abiotic pollination and suspension feeding. The standard model for examining particle capture is a stationary cylinder but it does not account for the natural movements of biotic collectors. This study examined the effects of collector motion in the transverse and longitudinal direction on capture efficiency using a cylindrical model in the lab and a grass species, Phleum pratense, in the field. Results from the both experiments indicated that movement increased particle/pollen capture efficiency and distribution, especially at low collector Reynolds numbers (Rec). This effect was greatest for transversely moving collectors with large magnitudes of motion, which encountered more particles with higher relative momentum. Results provided helpful insight into controversies in the literature and showed that collector motion can lead to different particle capture than the stationary model could predict and therefore, movement should be considered in particle capture models.

Particle capture, Timothy grass, Suspension feeding, Oscillation, Abiotic pollination, Anemophily, Physical ecology, Biofluid mechanics