How to make water bounce
Hello everyone, I have some exciting videos that I want to share with you! Using a high-speed camera setup in the lab, we can finally capture the details of the water dancing on these amazing superhydrophobic surfaces. Together with Drs. Kripa Varanasi, Ming Hsu, Nitin Bhate, and other GRC colleagues, we discovered that even when the surfaces had the same contact angle for stationary water droplets, their ability to resist the wetting of impacting droplets could be totally different.
In the following three videos, the contact angles of a stationary droplet on all three surfaces are ~150 degree. When an impacting droplet (with the same impact speed) hits on the surfaces, the droplet can either stay on the surface (video 1),
Look at the way the water droplet spreads, recoils, breaks into satellite droplets, and completely lifts off in video 3 – that’s what we really want for an impacting-droplet resistant surface! You might wonder what we can do with a cool thing like this? Imagine applications that involve high speed water droplets, such as wind turbine blade, airplane wing, or even just your car in motion. These are just a couple of the exciting possibilities that we are looking at.