Solution to Feynman's reverse sprinkler puzzle also applies to "silly sprinklers"
SMRTR summary
NYU researchers have confirmed their 2024 "momentum flux theory" by testing it on quirky "silly sprinklers" with looping, spiral designs. Their experiments showed that arm shape controls jet flow and rotation, contradicting both Mach's and Feynman's older hypotheses. The findings could help engineers design better turbines and other devices that convert fluid flow into energy.
SMRTR provides this summary for quick context. The original article belongs to Ars Technica.
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