What happens to the volume median diameter (VMD) of droplets as air speed increases when using flat spray nozzles at a 45-degree orientation?

As air speed increases when using flat spray nozzles at a 45-degree orientation, the volume median diameter (VMD) of the droplets tends to decrease. This phenomenon occurs because higher air speeds create greater aerodynamic forces acting on the droplets as they are ejected from the nozzle. With increased airspeed, the droplets become more finely atomized due to the shear forces exerted by the moving air, leading to smaller droplet sizes. Smaller droplets enhance coverage and improve the uniformity of the spray, which can be particularly beneficial for achieving effective pesticide application.

Understanding the relationship between air speed and droplet size is crucial for aerial applicators, as it helps optimize the application process, ensuring effectiveness while minimizing drift and maximizing target efficiency.