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Sprinkler Problem

All articles tagged with #sprinkler problem

science14 days ago•108 min saved

Sprinkler Spin Mystery Resolved: Central Momentum Drives the Motion

Physicists tested seven deliberately odd 'silly' sprinklers to settle a long‑standing question about reverse sprinklers. The experiments debunk both Mach’s angular‑momentum balance idea and Feynman’s pressure/suction theory, showing that rotation is governed by momentum flux at the central hub where the arms meet. The results imply the reverse sprinkler behaves like an inside‑out version of a forward sprinkler, with researchers planning simulations and potential energy‑harvesting applications.

via Live Science|

#feynman #fluid-dynamics #mach

physics2 years ago•3 min saved

"Decades-Long Mystery of Feynman's Sprinkler Problem Finally Solved by Mathematicians"

After decades of debate, a group of mathematicians claim to have finally solved Feynman's sprinkler problem, which asks how a sprinkler head would rotate if it sucked in water instead of expelling it. Using lab experiments and mathematical modeling, they found that a reverse sprinkler spins in the opposite direction when taking in water, due to the collision of incoming water jets generating torque to rotate the hub. The findings could have practical applications in engineering technologies to harvest energy from flowing air or water.

via ScienceAlert|

#fluid-dynamics #mathematical-modeling #physics

science2 years ago•3 min saved

"Mathematicians Crack Feynman's Reverse Sprinkler Puzzle"

Mathematicians at New York University have solved the long-standing "reverse sprinkler" problem, which has puzzled physicists since the 1940s. Their study, published in Physical Review Letters, combines lab experiments and mathematical modeling to reveal that a reverse sprinkler spins in the opposite direction when taking in water as it does when ejecting it, challenging conventional wisdom. This achievement adds to the lab's track record of addressing colorful real-world puzzles, including perfect bubble formation, stone forest formation processes, Tesla valve construction, and paper airplane aerodynamics.

via Ars Technica|

#flow-patterns #mathematics #physics