The Slow Mo Guys are a popular channel on YouTube, and masters of Flow Visualization in my opinion. They are able to show fluid interactions at extremely high frame rates and resolution with their very expensive Phantom cameras. This is one of their newer videos, and it showcases the moment when 2000°C thermite lands in a tank of 20°C water, at 1000fps in 8K upsampled resolution. What is particularly interesting about this video is that this molten thermite, so it doesn’t cool down as other metals would. Instead, it keeps its properties all the way to the bottom of the tank. I urge you to watch a minute or two of the video, Gav does a better job explaining the physics than I can. Artistically, this is just a beautiful display of what slow-motion cameras can capture. I personally could see this method (or video, if it was set as creative commons) used in film/video in very unique ways.
Also, this is just one video of hundreds that showcase FlowVis. Check out some of their other videos for more cool stuff! https://www.youtube.com/channel/UCUK0HBIBWgM2c4vsPhkYY4w
Credits: The Slow Mo Guys “Slow Mo Molten Thermite in Water”, Jul 18, 2020: https://www.youtube.com/watch?v=CO5OKAo8aIw
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This is my second choice. Due to the incredibly high temperature of burning thermite the surrounding water gets converted into steam creating. The rising steam and falling thermite create a very satisfying video. The slow motion along with the raw 8K footage shows the incredible detail in the flow.
This is my third choice! I think this video is incredible, and it shows something that I have never seen before. The Thermite interacts very unexpectedly under the water, and look very beautiful.