singing in the rain problem - espci paris · 2019. 1. 8. · singing in the rain problem. heat...
TRANSCRIPT
![Page 1: Singing in the rain problem - ESPCI Paris · 2019. 1. 8. · Singing in the rain problem. Heat exchange between a bouncing drop and a superhydrophobic substrate, S. Shiri and J. C](https://reader033.vdocuments.site/reader033/viewer/2022053108/607a9345e497590654456238/html5/thumbnails/1.jpg)
What is the cooling rate of a superhydrophobic surface
submitted to rain ?
Singing in the rain problem
![Page 2: Singing in the rain problem - ESPCI Paris · 2019. 1. 8. · Singing in the rain problem. Heat exchange between a bouncing drop and a superhydrophobic substrate, S. Shiri and J. C](https://reader033.vdocuments.site/reader033/viewer/2022053108/607a9345e497590654456238/html5/thumbnails/2.jpg)
Heat exchange between a bouncing drop and a superhydrophobic substrate, S. Shiri and J. C. Bird, PNAS, 114, 6930 (2017)
![Page 3: Singing in the rain problem - ESPCI Paris · 2019. 1. 8. · Singing in the rain problem. Heat exchange between a bouncing drop and a superhydrophobic substrate, S. Shiri and J. C](https://reader033.vdocuments.site/reader033/viewer/2022053108/607a9345e497590654456238/html5/thumbnails/3.jpg)
Using scaling arguments, derive the time evolution of temperature on the substrate after the rebound of the drop
![Page 4: Singing in the rain problem - ESPCI Paris · 2019. 1. 8. · Singing in the rain problem. Heat exchange between a bouncing drop and a superhydrophobic substrate, S. Shiri and J. C](https://reader033.vdocuments.site/reader033/viewer/2022053108/607a9345e497590654456238/html5/thumbnails/4.jpg)
Derive a scaling relation between Q the amount of heat transferred and the radius R of the impacting drop.
The contact time scales as (ρR3/γ)1/2