Скачать или смотреть Transport Mechanisms Induced by Raindrop Impact by Professor Sunghwan Jung

AMSI-ANZIAM Lecturer Dr. Sunghwan (Sunny) Jung is a professor in the Department of Biological and Environmental Engineering at Cornell University. This colloquium was delivered at the University of Newcastle in February 2025. Transport Mechanisms Induced By Raindrop Impact
Plant leaves possess a remarkable ability to adapt and withstand external fluidic stimuli in the wild. Rainfall, in particular, exerts impulsive stress on plant leaves, causing them to twist, bend, and vibrate, leading to the shedding of spores and allergens. These interactions between the raindrop and leaf have raised some intriguing scientific questions and practical applications. Upon impact, air vortices form and play a pivotal role in spore dispersal, with a single raindrop capable of dispersing over a thousand spores. These initial vortices lift spores beyond the boundary layer, enabling them to be carried away by the wind. Subsequently, the vibrating motion of the leaf further induces flow coherence and enhances the transport of spores. Through Lagrangian diagnostics, we have further discovered the presence of hyperbolic and elliptical coherent structures around fluttering leaves, providing a dynamic description of spore transport.