June 25, 2020
Chemicals released into the air could become less hazardous, thanks to a missing math formula for droplets
Drones and other aircraft effectively spray pesticides over miles of crops, but they can pollute the environment if carried off-target. One problem is that tiny droplets are hard for aerial crop sprayers, inkjet printers and other machines to control. Purdue University engineers are the first to come up with the math formula that was missing to measure a key property of these droplets. Dr. Osman Basaran, the Burton and Kathryn Gedge Professor of Chemical Engineering, and his students have figured out a way to calculate surface viscosity by looking at how a droplet stretches. A picture taken of the stretched droplet as it starts to break gives the values to put into a simple math formula that provides the surface viscosity measurement.