How powerful is the drop of water? “Nature” sub-issue: such as miniature bombs spread supersonic speed
We are not unfamiliar with the allusion to “dropping water through a stone”. We seem to have taken this phenomenon for granted since we heard this story, but this phenomenon has been a long-standing problem in physics. How does water drip through a hard stone?
Recently, a study published in “Nature Communications” revealed the mysterious power of water droplets. The research team said the discovery could help design materials that are more resistant to wear.
The study of droplets is not new, and researchers have long been fascinated by it. But until now, most research has been limited to visual analysis, such as capturing water droplets falling and hitting surfaces with high-speed cameras, which obviously misses a lot of necessary detail.
In the study, the team of scientists developed a new technique known ashigh speed stress microscopywhich can be passed throughDirectly measure the force, stress and pressure below when the droplet hits the surface, showing the process more intuitively.
The researchers found that,The force exerted by the droplet actually spreads with the impacting droplet, rather than being concentrated in the center of the droplet, and the droplet spreads faster than the speed of sound for a short period of time, creating a shock wave on the impacted object.
simply put,Each droplet acts like a miniature bomb, releasing its impact energy explosively, eroding the surface.
In order to waterproof, people usually apply a layer of protective paint on the building, or add a coating to the surface of some instruments exposed to the outdoors, to protect the surface, but over time, raindrops can still bring inevitable damage. .
With this research finding,Scientists have begun to study different textures and materials to alter the forces created by the impact of droplets. The researchers believe the new findings could help design better erosion-resistant surfaces, such as ways to reduce the impact of water droplets.
Hashtags: Shockwave Journal Liquid
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