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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

II. Books, Encyclopedia, Discussion and Forum Posts


III. Research Papers

  • Michelson, Irving(1969). Fluidic Jet Impingement-Analytical Solution and Novel Physical Characteristic. , 223(5206), 610-611. doi: 10.1038/223610a0
  • Bolek, A., & Bayraktar, S. (2019). Flow and heat transfer investigation of a circular jet issuing on different types of surfaces. Sādhanā, 44(12).