NYU Researchers Identify Physical Mechanisms Behind Reverse Sprinkler Motion

Mathematicians at New York University’s Courant Institute have identified the physical mechanisms behind the “reverse sprinkler” phenomenon, a long-standing puzzle in fluid dynamics. By constructing a device that draws water inward rather than spraying it outward, the researchers observed how the system interacts with its environment to produce motion. This study provides a definitive explanation for the behavior of these devices, which have challenged physicists since the mid-20th century.

The research team utilized a specialized apparatus to measure the forces at play when a sprinkler functions in reverse. While a standard sprinkler rotates due to the momentum of water exiting its nozzles, the reverse sprinkler—which pulls fluid into its arms—exhibits a more complex interaction between internal flow and external resistance. The scientists found that the device’s rotation depends on the specific way the fluid enters the system and how the surrounding medium reacts to that intake. These findings clarify the role of fluid inertia and pressure gradients in determining the direction and speed of the device’s movement, effectively resolving the debate surrounding the mechanics of reverse-flow systems.

Newsflash | Powered by GeneOnline AI

Source: GO-AI-ne1

For any suggestion and feedback, please contact us.

Date: July 14, 2026

Author

GOAI