Have you ever pondered why some raindrops on your windshield don’t move while others slide upwards or down? IT makes sense gravity pulls down droplets but why would they flow up while some don’t budge?
Physicists have looked into this and released a new study that shows the size of the drop determines if it drops stay put or take a ride.
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It turns out larger drops move downward because of gravity, while the smaller drops move upward from the force of the wind blowing over the windshield. Medium-sized raindrops, stay fixed when both forces cancel each other out.
If you've ever been amazed by how some rain drops climb up your vehicle's windshield while some others slide down, check out our mathematical modeling about "Dynamics of a partially wetting droplet under wind and gravity" just published in @PhysRevFluids. https://t.co/v4Oig3mas5 pic.twitter.com/mthDCaYRdq
— Alireza "Navid" Hooshanginejad (@hooshanginejad) March 4, 2022
The results are not the same on all vehicles since raindrops on steeper windshields slip from gravity more than on less angled windshields.
