Problem 4: Unsinkable Disk
“A metal disk with a hole at its centre sinks in a container filled with water. When a vertical water jet hits the centre of the disc, it may float on the water surface. Explain this phenomenon and investigate the relevant parameters.”
I. Phenomenon Demonstration
- Unsinkable Disk IYPT2022 by ЭйНШтейн https://youtu.be/Wi1K2yRbMLo
- Unsinkable disc by GetAClass – Physics in experiments https://youtube.com/watch?v=eP5_9eUjfkI
II. Books, Encyclopedia, Discussion and Forum Posts
- Introduction to Impinging Jets by LearnChemE https://youtube.com/watch?v=rjJciObMiE8
Impinging jets https://thermopedia.com/content/872/
III. Research Papers
- Michelson, Irving(1969). Fluidic Jet Impingement-Analytical Solution and Novel Physical Characteristic. , 223(5206), 610-611. doi: 10.1038/223610a0
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Bolek, A., & Bayraktar, S. (2019). Flow and heat transfer investigation of a circular jet issuing on different types of surfaces. Sādhanā, 44(12). https://doi.org/10.1007/s12046-019-1226-6