The study, published in the journal Physical Review Letters, was conducted by researchers at the University of Cambridge and the University of Twente in the Netherlands. The team used a high-speed camera to capture images of water droplets boiling on a heated surface at a rate of 10,000 frames per second.
The images showed that as a drop of water is heated, it begins to form small bubbles on its surface. These bubbles grow and merge, until they eventually become so large that they can no longer support the weight of the water droplet. At this point, the droplet takes off from the surface and is ejected into the air.
The researchers found that the size of the bubbles that form beneath a drop of water is determined by the temperature of the surface. At lower temperatures, the bubbles are smaller and the droplet takes off more slowly. At higher temperatures, the bubbles are larger and the droplet takes off more quickly.
The findings of this study could have implications for a number of applications, including the design of boilers, heat exchangers, and other devices that involve the boiling of liquids.
"Our study provides a new understanding of how boiling drops take off from a heated surface," said Dr. Christopher Eggleton, a researcher at the University of Cambridge and one of the authors of the study. "This knowledge could be used to design more efficient boilers and heat exchangers, and could also lead to new applications for boiling drops, such as in the production of microdroplets for drug delivery."
