Within the field of physics, the idea of perpetual motion is not allowed in most references. However, in a still fluid, one potential perpetual motion example is offered: a hollow solid cone rotating about its long axis at a constant rate.
References
[1]
Kenyon, K.E. (2020) Cone Rotating in a Fluid. Natural Science, 12, 1-3. https://doi.org/10.4236/ns.2020.121001
[2]
Kenyon, K.E. (2020) Nature’s Translating Cone Rotating under Water Translates. European International Journal of Science and Technology, 9, 9-10.
[3]
Adachi, T., Takahashi, Y., Akinga, T. and Okajina, J. (2018) Effect of Viscosity on Pumping up of Newtonian Fluid Dnion by a Rotating Cone. Journal of Flow Control, Measurement and Visualization, 6, 57-65. https://doi.org/10.4236/jfcmv.2018.62006
